In late summer and early autumn, we still have a large number of species flying. A good, ‘natural’ garden stocked with native herbs and trees can attract all of the species featured below. Here is a selection of these butterflies and moths. All but one of the moths shown are strictly nocturnal and spend the daylight hours concealed among the leaves of trees and shrubs.
Scorched Carpet, double-brooded in the south and midlands of Ireland, breeds on Spindle. This foodplant relies on calcareous soil, which means the moth is found in limestone areas and areas with lime in the soil. The moth occurs in areas of scrub and hedgerows, including some gardens.The Canary-shouldered Thorn breeds on a range of deciduous trees. It flies mainly during September and is striking for its canary-yellow thorax. Despite the bright colouring, the moth is rarely seen unless a light trap is used to attract it. It likes wooded areas, including mature gardens.The Frosted Orange breeds on thistles, particularly on Creeping Thistle, where the larva feeds internally on the plant stems. Despite the abundance of the foodplants, the moth is not very abundant in Ireland. It flies in August and September.The Gold Spot likes wet areas, including marshes, where its wetland foodplants, like Flag Iris, occur. It flies in two broods, in June and later in August/September. It is common in Ireland. It can sometimes be seen flying during daylight, during overcast, mild weather.The Common Blue (male pictured) is widespread in Ireland in grassy places, using a number of vetches and clovers as larval foodplants. Black Medic and Common Bird’s-foot-trefoil are commonly used where these grow in suitable conditions. The species flies in at least two generations annually, and responds to summer drought by producing very small individuals in late summer. In some years it flies into early October.The Small Copper belongs to the same butterfly family as the Common Blue. It breeds on Common and Sheep’s Sorrel, both dock species. This beautiful, active butterfly is widely distributed in Ireland but it is rarely numerous in any one place. Two or even three broods can be seen per year. In years with three broods, it flies from May to October, with an overlap between the second and third broods in years with prolonged warm weather in late summer and autumn.The Brimstone butterfly (the male is brimstone yellow on the upperside of his wings) produces just one generation each year. It is our longest-lived butterfly in the adult form, lasting up to a year. This one hatched in August and is feeding for a few days before disappearing for the rest of the year, reappearing in March to breed. Eggs are laid, in Ireland, on two small trees, Purging Buckthorn and Alder Buckthorn. A puzzling feature of this species is that the abundance of the insect in spring is often unmatched by its apparent relative scarcity during the previous summer and autumn.Red Admiral on Devil’s-bit Scabious. The butterfly in this photo is perfect, having emerged the day the photograph was taken. After feeding, this butterfly is likely to migrate southwards, heading to the continent to breed. Some will stay put, breeding here, in warmer coastal locations, where the immature stages will develop slowly during the colder months. This is a recently noted change; before 2000 all autumn Red Admirals were understood to leave Ireland in autumn. Now, most still do so, but this is changing.
The National Biodiversity Data Centre (NBDC), based in Waterford, has been tracking the fortunes of Ireland’s butterfly populations since 2008. Using 2008 as the baseline for abundance, the recording scheme used by the NBDC the Irish Butterfly Monitoring Scheme (IBMS), involves 26-weekly transect walks carried out during the main flight period from April 1 to September 30. This scheme tracks abundance and flight periods. In addition, the Five-visit Monitoring Scheme also collects data on abundance.
The news emerging from the NBDC over the past two years is concerning. In 2020 and last year the multi-species index showed that once again there was a moderate decline in the number of butterflies flying when compared to the baseline year of 2008 (the start of the monitoring scheme). In terms of the individual species trends, no species shows a positive trend with only two species having ‘stable’ trends and all other species showing either ‘declining‘ or ‘uncertain’ trends when compared to the baseline year of 2008.
In Britain, a new Red List has been published this year, showing that half of Britain’s remaining butterfly species are listed as threatened or near threatened. The Irish Red List, published in 2010 and outdated classifies 33% of our species as threatened or near threatened. The List should have been re-evaluated in 2020 but will now be revised following the collation of data for the Irish Butterfly Atlas 2017-2021, probably in 2023.
When the Irish list is re-evaluated, it is likely that some additional species will be red-listed.
Nostalgia often leads us to think that the past was a better time, and butterfly memories charm reminiscence. We recall times of butterfly abundance in fields and gardens, but the absence or scarcity of data means verification of abundance trends is elusive. What can be gleaned from records taken before 2008 are some indications of distribution change.
It is quite clear why some butterflies are no longer found in certain places. Clearly, when land is built on, the composition of species that live on the land will change, with some doing well, such as the Holly Blue, which finds suburbia highly convivial, and others, like the Wall Brown, disappearing. The more disturbing and mysterious feature of butterfly loss is when a species has vanished, but the habitat remains, apparently unchanged. Subtler forces are at play when this occurs, and such circumstances can be difficult to discover and may be beyond our ability to address.
Some land use changes that cause distribution loss are avoidable and often irreversible. The widescale drainage of bogs, afforestation of bogs and peat extraction has certainly reduced the distribution of bog species, especially the Large Heath butterfly. Extensive changes in land management, particularly farmed land, have powerful impacts on butterflies, especially because 85% of our land is farmed.
A relatively new threat is the impacts arising from introduced invasive alien species, especially along hedges and stone walls in the countryside. The rampant weed, Montbretia, is a serious pest species, forming dense bands along hedgerows, eliminating all native herbs that butterflies, moths and other invertebrates require for their life cycles. This problem is increasingly acute, because of the increased relative biodiversity value of our native hedges and associated extended margins. Recently, Montbretia is appearing along the boreens of the Burren to sinister effect.
We appeal to everyone, especially if you live in a rural area, to remove this plant. It can be easily pulled up and the bulbs will yield easily. These must be destroyed. There are websites that advise on the eradication of this extremely damaging weed.
Montbretia makes up 100% of the flora on roadsides, eliminating native plants (it even excludes nettles) used as food for butterfly larvae. Montbretia does not belong in our ecosystems and must be eliminated before severe damage is done. The four new corms arising from one plant in the photo above show how invasive the plant is. The photograph was taken at Fanore, in the Burren, County Clare.
Another culprit is Fuchsia, a shrub that often accompanies Montbretia, and which is another invasive alien species that displaces native plants. While undeniably pretty, the plant has very little value as a breeding plant, unlike the native shrubs it crowds out. It is hard to get rid of once established and may need to be killed using an herbicide. Our advice is to avoid planting it and grow a native shrub instead.
Fuschia is a dominant shrub on many parts of the Dingle peninsula, and in other areas, and is replacing native food sources for invertebrates. Never allow this plant to naturalise near your home. This photo was taken at Fanore, in the Burren, County Clare.
If the avoidable threats from introducing non-native plants cannot be dealt with, our deeper problems are even less likely to be tackled. However, conservation is also about what not to do.
Do not grow non-native plants, unless you want them in your garden, but make sure they stay there. Do not buy peat for the garden or the fireplace. Leave peat where it belongs, in the bog. Do not buy electricity from wind or solar suppliers if the electricity they generate is derived from infrastructure built on bogs. Our bogs have taken all the abuse they can, and more. They must be re-wetted and allowed to begin recovery of their distinctive habitats and carbon capture capacity.
On top of the things that we need not do, there is a lengthy to-do list. Much of this relates to changes needed in the way our land is farmed, and this is a huge policy question internationally. The widescale use of chemicals is a very significant challenge along with the use of single or reduced-species swards to graze livestock.
A related, and global challenge to biodiversity, of which butterflies are one of the most charismatic and visible symbols, is climate change. Climate change is strongly associated with the over-exploitation issues already stated, as well as its link with industrialisation. Pollution, which is a driver of climate change also changes the soil conditions needed by butterfly foodplants, while increasing temperatures cause a complex range of challenges and outcomes which vary according to species and location.
Therefore, issues such as land use changes and climate change influence butterfly distributions, but the NBDC report quoted in the introduction deals with abundance trends (and flight times) in other words, how large our populations are compared with their 2008 baseline.
When only two out of our 35 butterfly species are recorded as having a stable population, we should not doubt that our butterflies and wildlife generally are under pressure, as a direct result of our behaviour.
The two stable species are the Peacock and Brimstone, although the evidence so far submitted to Butterfly Conservation Ireland this year suggests abundance declines for both in 2022.
The really worrying feature is the decline of very common, widely distributed species. Our best-distributed butterflies are four whites: Large, Small, Green-veined White and Orange-tip, the Small Tortoiseshell, and three browns: Speckled Wood, Meadow Brown and Ringlet.
Selecting one year only will not tell us much if anything about trends. Let us see how these did in 2008-2020 and 2012-2021.
Large White:
Trend 2008 – 2021 – Strong decline (-76%)
Trend 2012 – 2021 – Moderate decline (-34%)
Small White:
Trend 2008 – 2021 – Strong decline (-77%)
Trend 2012 – 2021 – Moderate decline (-44%)
Green-veined White:
Trend 2008 – 2021 – Strong decline (-87%)
Trend 2012 – 2021 – Strong decline (-59%)
Fertiliser use is removing habitat for the Green-veined White which is also at risk from drought caused by our longer, drier summers.
Orange-tip:
Trend 2008 – 2021 – Strong decline (-68%)
Trend 2012 – 2021 – Moderate decline (-20%)
Small Tortoiseshell:
Trend 2008 – 2021 – Moderate decline (-49%)
Trend 2012 – 2021 – Uncertain (no significant change, changes likely to be >5% per year)
The familiar Small Tortoiseshell loves human company. This lovely butterfly is feeding in our gardens now, and entering our houses to seek roost and over-wintering sites.
Speckled Wood:
Trend 2008 – 2021 – Strong decline (-78%)
Trend 2012 – 2021 – Moderate decline (-40%)
Meadow Brown:
Trend 2008 – 2021 – Strong decline (-86%)
Trend 2012 – 2021 – Moderate decline (-70%)
The Meadow Brown was once described as “a butterfly that is hard to get rid of.” Not any longer, according to the decline statistics.
Ringlet:
Trend 2008 – 2021 – Strong decline (-88%)
Trend 2012 – 2021 – Strong decline (-62%)
There is a group of butterflies that are not as widespread as these but are still widely distributed but more specialised in their requirements. Two examples are given here.
Small Copper:
Trend 2008 – 2021 – Moderate decline (-69%)
Trend 2012 – 2021 – Uncertain
Small Heath:
Trend 2008 – 2021 – Moderate decline (-76%)
Trend 2012 – 2021 – Uncertain
The IBMS report 2021 does not make any attempt to interpret the reasons for these declines but changes in how land is farmed must be the greatest influence on populations. Chemical usage is a major factor driving declines. Two doses of NPK fertiliser per year plus an application of herbicide rids grasslands of plant diversity and benefits a small number of vigorous grasses. Add to that the spread of non-native, invasive species on the last strips of farmland, the hedge and strip of parallel land at the field margins, especially adjoining public roads, and the last vestige of habitat is lost.
There is little doubt that habitat loss is the major factor driving the current declines of widespread butterflies, and that widespread, severe environmental degradation is the key issue. With a degraded environment, resisting and adapting to climate change is becoming impossible.
Moreover, add cobblelock and tarmacked driveways replacing gardens, public green spaces planted with useless and harmful non-natives and mismanaged, and our best wild places neglected.
We get what we deserve.
In F. Scott Fitzgerald’s novel, The Great Gatsby, an incident occurs when a drunken guest who attended Gatsby’s party crashes the car into a wall, causing it to lose a wheel.
“But how did it happen? Did you run into the wall?”
“Don’t ask me”, said Owl Eyes, washing his hands of the whole matter. “I know very little about driving-next to nothing. It happened, and that’s all I know.”
“Well, if you’re a bad driver you oughtn’t to be driving at night.”
“You don’t understand,” explained the criminal. “I wasn’t driving. There’s another man in the car.”
…a pale dangling individual stepped out of the wreck, pawing tentatively at the ground with a large uncertain dancing shoe.
“Wha’s matter?” he inquired calmly. “Did we run outa gas?”
“Look!”
Half a dozen fingers pointed at the amputated wheel-he stared at it for a moment, and then looked upward as though he suspected that it had dropped from the sky.
“It came off,” someone explained.
… “Wonder’ff tell me where there’s a gas station?”
At least a dozen men, some of them a little better than he was, explained to him that wheel and car were no longer joined by any physical bond.
“Back out,” he suggested after a moment. “Put her in reverse.”
“But the wheel’s off!”
He hesitated.
“No harm in trying,” he said.
(The Great Gatsby, Penguin edition, pp. 55-56)
This incident foreshadows a much more serious car accident later when the consequences of human excess, irresponsibility, and delusion destroy the most vulnerable in the story. The motor car operates as a symbol of wealth, status, individualism, and human achievement yet it plays a major role in the destruction of idealism and happiness. The novel implies the moral and ecological bankruptcy of man’s exploitation of nature when the serious accident occurs in a grotesque “valley of ashes,” an industrial wasteland presided over by a billboard showing pair of sightless eyes, mistaken by a grieving character for the eyes of God. Without seeing where we are heading, without heeding the relationship between our treatment of Earth’s ecosystems and our reliance on them, we will lose more than our butterflies.
The butterfly is a symbol of all that is good and healthy in our world. Where they abound in their diversity of species, the ecosystems are healthy and functioning as they should be. As August stands on the doorstep of September, enjoy the butterfly spectacle now on show in nectar-rich gardens. Spectacular though it is it will be of short duration. Their brevity and vulnerability should touch us to respect and love our butterflies and the landscapes they represent even more.
Flower-rich semi-natural grassland is just a memory in many places. Soon areas like this will be a myth.
Key Reference
Judge, M and Lysaght, L. (2022), The Irish Butterfly Monitoring Scheme Newsletter, Issue 14.
When will we ever learn? Nature is in crisis. Changes in land and sea use, overexploitation of biological resources, climate change, pollution, and invasive alien species have eroded our once rich natural capital and pushed more species to the edge of extinction than at any other point in human history. In the last four decades alone, global wildlife populations have fallen by 60% because of human activities, and nature is now in steep decline in almost every corner of the planet.
We face the extinction of three-quarters of global biodiversity by 2100 if we continue to pump the same quantity of greenhouse gases into the atmosphere as we have during the past decade.
The effects of climate change on animal and plant populations can be simple and complex. A relatively simple example is that some animals that favour warm conditions are shifting their European distributions further north, and to sites with a northerly aspect and to more elevated altitudes as these areas, now warmer, become suitable. Some species that favour cool conditions are responding in the same way, to avoid the habitat and other changes created by increasing warmth and because the increased temperature is enabling these cool climate specialists to use areas that had previously been too cold.
There are limits to the success of these responses. In a scenario of continued temperature rises, some species, such as the montane and arctic butterflies (such as Lapland Fritillary Hypodryas iduna), will run out of higher ground and cooler terrain to retreat to. This species breeds in damp habitats such as bogs and marshes. Increased heat will change the character of these areas resulting in habitat change and likely extinction. One of the world’s rarest species, the Sinai Hairstreak Satyrium jebelia, breeds on buckthorn bushes growing at altitude on the Sinai Peninsula. High-mountain endemics with very restricted ranges are likely to have a high risk of extinction under the various scenarios of global warming.
Endemic to the high mountains of the St Katherine Protectorate in South Sinai, the total world population in 2012 was estimated to be 1,010 individuals. Aspects of hostplant and habitat quality were significant predictors of the presence of Sinai Hairstreaks on individual trees. No immediate threats are evident except global warming: if current climate-change predictions for Egypt are correct, the quality of habitat and plant diversity will decrease in the St Katherine Protectorate, with negative conservation results likely (Power et al. 2014).
Let us look at just a couple of our butterflies, the Small Tortoiseshell and Peacock butterflies.
The Small Tortoiseshell butterfly is faring better in Ireland than in Britain. Here the population is regarded as showing a moderate increase (Judge and Lysaght, 2020) while in the UK it has shown a significant major decrease in abundance of -73% from 1976-2014 (Fox et al. 2015). It should, however, be noted that the Irish abundance study covered a shorter time (2008-2020) than the UK study. The species has declined in abundance by over 70% in Europe (Van Swaay, pers. comm. April 2021).
However, we should not be complacent about the butterfly’s abundance in Ireland. The arrival of the parasitoid, Sturmia bella, a fly species, in England in the late 1990s (first confirmed in Peacock caterpillars in Hampshire in 1998) has had a significant impact on the Small Tortoiseshell (and to a lesser extent, on the Peacock butterfly) in England. S. bella occurs naturally in Europe and its appearance in England may be the result of accidental or deliberate introduction or the result of climate change. S. bella lays its eggs on nettle leaves which are ingested by Small Tortoiseshell and Peacock caterpillars. The egg hatches inside the caterpillar. The parasitoid kills its host after the caterpillar pupates. The grub descends from a thread to pupate on or in soil.
A study by Gripenberg et al. (2011) found that the fly was present in 26% of larval groups of the Small Tortoiseshell assessed and that survival was 25–48% lower in batches of Small Tortoiseshell larvae where S. bella was present, indicating that S. bella causes host mortality in addition to that caused by native parasitoids. In some batches, all the caterpillars were infected. S. bella was found as far north as Lincolnshire, and the Small Tortoiseshell has declined significantly south of Lincolnshire but not north of this county. The report concludes that S. bella may be playing a role in the recent decline of the butterfly but “further research is needed to establish its effects relative to other potential drivers of trends in the abundance of this butterfly.” (Gripenberg et al. 2011)
S. bella also attacks the Peacock, Comma, Painted Lady, Speckled Wood and other butterfly species, but none of these are in decline in England. The Peacock’s stable status might be partly because the Peacock favours different breeding sites, particularly nettles close to woods, where S. bella is less common and because the Peacock, which is single-brooded, produces its larvae mainly between April and June, when S. bella is not numerous. The Small Tortoiseshell produces two or even three broods, and the second brood of larvae, in July, coincides in time with the abundance of S. bella.
The Small Tortoiseshell continues to thrive in Ireland, occurring in up to three generations in some areas during favourable years. Photo J. Harding
A further climate-related problem for the Small Tortoiseshell is that prolonged dry weather in mid-summer reduces foodplant quality which may cause longer development times for the larvae or which results in the butterfly cancelling reproduction in the year of its birth and undergoing a reproductive diapause until the following spring. This necessitates a prolonged hibernation with adults entering their dormant state in July instead of September/October. This strategy helps the butterfly avoid second brood production which is more at risk from the effects of malnutrition and S. bella than its first brood, produced in spring. But it would certainly be at increased risk from animals that have not yet over-wintered and that use Small Tortoiseshell hibernacula as roosts or breeding sites, such as Brown Long-eared Bats Plecotus auratus.
The Small Tortoiseshell and Peacock have several native parasitoids to contend with. Larvae of the Small Tortoiseshell and the Peacock are also attacked by several other parasitoid species, of which the most common ones are the ichneumonid wasp Phobocampe confusa Thomson, the braconid wasp Cotesia vanessae, and the tachinids (fly species) Phryxe spp., Pelatachina tibialis, and Compsilura concinnata. These are all endoparasitoids (the parasitoids develop inside the host), and in all cases the parasitoid larvae emerge from the fully developed caterpillars before host pupation.
Small Tortoiseshell pupae (and the pupae of several butterfly and moth species) are attacked by a wasp, Pteromalus puparum, discovered in Ireland in 2002 (but present before that date, with the earliest known museum specimen dated 1928) which lays its eggs into newly formed, still soft pupae. Although the pupa is aware it is being disturbed and wriggles vigorously, it has no defence. Instead of a butterfly emerging from the pupa, tiny wasps, which may number over 100, bite their way out and exit through tiny holes. This parasitoid wasp is widespread in Ireland and has been found as far apart as Warrenpoint, County Down (1928), Glengariff, County Cork (1943) and Drumachon, County Kildare (2015).
This newly formed Small Tortoiseshell chrysalis is being infected by Pteromalus puparum, on August 18, 2015, Drumachon, Co. Kildare. Photo J. Harding
Aside from S. bella, the native parasitoids have been present in England and Ireland for a long period, and these did not cause a prolonged decline in the species. However, irresponsible behaviour such as deliberate introduction can bring in a new parasitoid that creates severe difficulty for our native species.
A warming climate also encourages colonisation events, bringing threats to our indigenous species. It should be underlined that S. bella is native to Europe, so the great decline in the Small Tortoiseshell in the continent has not been explained by reference to the fly, and the causes of decline are currently unknown. However, could the decline be attributed to a warming climate favouring the fly?
And does the warming climate mean that the fly can make greater use of other host species? One reason for the Peacock’s lower vulnerability to S.bella is its use of nettles at wood edges, where the Peacock has a warmer micro-climate. However, recently the Peacock has also been observed using nettles in more open situations, possibly because the warming climate now makes these suitable; I have encountered several Peacock larval clumps on nettles along a track running through an open field.
For the second year in succession, the Peacock has shown a great decline in abundance in many areas in Ireland. This has been noted as a widespread reduction, in areas as distant as the Burren, County Clare, Lullymore, Co. Kildare, and County Antrim. This is a sudden and dramatic abundance decline, following the Peacock showing a “strong increase” 2008-2020 (Judge and Lysaght, 2020). The Peacock is believed to have benefited from the warming climate. In the 1960s it was a rare migrant to northern Scandinavia. In the 1970s it began to acclimatise, beginning to survive hibernation over the winter. Today, it is one of the most abundant Nordic species in late summer (Haahtela et al. 2011). Parasitoids might be responsible, however for the population reduction during the past two years. The coming years will tell us if this decline is a trend, but it is far too early to make any assessment.
Peacock butterfly, August 2022. The large populations frequently observed in flower-rich sites from 2008-2020 have not been repeated in the past two years, 2021-2022. Photo J. Harding
One useful conservation response the gardener can make is to allow nettles to grow in different areas, in semi-shaded, unshaded, exposed and sheltered locations. Heterogeneity in the location of the nettles offers the best hope of satisfying the breeding requirements of the Peacock under the changing circumstances wrought by the changing climate.
We are incapable of reversing climate change as individuals, and whatever the causes driving the decline of the Small Tortoiseshell in England, one fact is at least clear. One should not bring plants (including from overseas nurseries), eggs, larvae or pupae from Europe into Ireland or Britain, or from Britain into Ireland. The immature stages of butterflies often contain parasites or even viruses which our butterfly populations do not need, especially with climate change and habitat change and loss added to the challenges faced by our beleaguered butterflies.
Key References
Fox, R., Brereton, T.M., Asher, J., August, T.A., Botham, M.S., Bourn, N.A.D., Cruickshanks, K.L., Bulman, C.R., Ellis, S., Harrower, C.A., Middlebrook, I., Noble, D.G., Powney, G.D., Randle, Z., Warren, M.S. & Roy, D.B. (2015). The State of the UK’s Butterflies 2015. Butterfly Conservation and the Centre for Ecology & Hydrology, Wareham, Dorset.
Gripenberg, S., Hamer, N., Brereton, T., Roy, D. B., Lewis, O.T. (2011). A novel parasitoid and a declining butterfly: cause or coincidence? Ecological Entomology, 36, 271–281.
Haahtela, T et al. (2011) Butterflies of Britain and Europe. A&C Black, London.
Judge, M and Lysaght, L. (2020) ‘2019, the year of the Painted Lady’, The Irish Butterfly Monitoring Scheme Newsletter, Issue 13.
O’ Connor, J. P. 2002, “Pteromalus puparum (L.) (Hym.: Pteromalidae), a chalcid new to Ireland” The entomologist’s record and journal of variation Vol. 114 pp. 111-112. Available at https://www.biodiversitylibrary.org/part/194950 (Accessed 22 August 2022)
Power, A., Zalat, S. & Gilbert, F. 2014, “Nowhere left to go: the Sinai Hairstreak Satyrium jebelia”, Journal of insect conservation, vol. 18, no. 6, pp. 1017-1025.
Cast your imagination back 125,000 years. The climate then was as warm, on a sustained basis, as it has been in the past decade. Where Trafalgar Square stands today, alligators, hippopotami, and lions roamed the savanna while elephants grazed the banks of the Thames. Today, Sir Edwin Landseer’s bronze lions guarding Nelson’s column grandly survey the Square where the wildlife consists mundanely of feral pigeons.
Imaginative indulgence conjures dreams of restoration ecology, beloved by hankerers for the recovery of ecosystems deficient in parts of the puzzle. In Ireland, such projects are usually concerned with iconic apex predators, such as the Grey Wolf, Red Kite, White-tailed Sea Eagle, and Golden Eagle. The latter three have been introduced to Ireland while the Grey Wolf is busy recovering lost territory throughout western Europe, under its own steam, but benefiting from the ban on poisoning and hunting that brought the animal to the edge of oblivion in most of Europe in the late 1970s.
But clocks are not easily turned back, and as the Covid pandemic demonstrated, we are not in control. The greater powers, the wrath of whom we have provoked, are in the ascendant. We are reactors, employing a scattergun approach to problem-solving that Manchester United’s transfer negotiator John Murtough would recognise, but be embarrassed by.
Our vulnerability to greater power than our meagre selves was spelled out to the cabinet committee on the environment and climate change in early May 2022 by Professor Peter Thorne, a lead author on the Fifth Assessment Report of the Intergovernmental Panel on Climate Change and one of the world’s leading climate experts.
Professor Thorne told the Climate Committee, which consists of the Taoiseach (Prime Minister), Tánaiste (deputy Prime Minister), Ministers of Public Expenditure and Reform, Social Protection, Agriculture, Climate Action, Tourism and Housing, that to keep the temperature below 1.5 Celsius above the pre-industrial era temperature, we need net emissions to reach zero by 2050. This requires halving methane emissions and getting carbon emissions to net zero.
You probably knew that. But then the devastating news was delivered that stabilisation of all effects of climate change is impossible in the next few centuries. Sea levels will rise by five metres.
There is nothing we can do to change this.
If you live in Cork City, Limerick, Galway, or Belfast you are in peril, especially if you are in junior infants’ class, typically a five-year-old. Here is what the sea level rise means for Dublin.
By the time our five-year-olds reach old age, Dublin will no longer contain Sandymount, Blackrock, Monkstown, Sandycove, Dun Laoghaire, and Ringsend on the south side and Malahide, Clontarf, Portmarnock and Sutton on the north side of the River Liffey. The Hill of Howth will be an island and there will be no Bull Island. The Liffey, by then hundreds of metres in width, will enter the sea at Phoenix Park. Dublin Bay will stretch from Cabra on the north side to Donnybrook to the south. The flooding will reach Lombard Street, near Trinity College.
Flood Map of Dublin 2100 (Image Climate Central)
The past 10,000 years have seen a remarkably stable global climate, allowing humans to develop from nomadic hunter-gatherers to settle in great urban centres facilitated by the industrial and agricultural revolutions. This climate stability is rapidly unraveling, according to Professor Thorne.
It will be worse elsewhere, such as on the Indian sub-continent, but we will feel the shocks, directly, economically, and in human terms, with mass migration to this country. We are at the edge of human livability in some areas already, such as the Horn of Africa, and this year, in parts of India.
If we are stupid enough to go to three Celsius above pre-industrial temperatures by the time our Junior Infants reach advanced old age, and this is where we are heading with current emission levels, 75% of all the planet’s biodiversity will be lost. Imagine what such a world would look like.
Many of our familiar plants and animals have ceased to exist. The photographs in The Irish Butterfly Book will likely show several extinct species. I wonder if the Wall Brown, Hedge Brown, Small Heath and Large Heath will still exist. These species are already in serious decline, and climate change and issues driving climate change are among the causes. The extinction list is also likely to contain the species that need well-drained skeletal soils: Dingy Skipper, Small Blue, and Pearl-bordered Fritillary.
The Pearl-bordered Fritillary breeds on violets growing on thin, fertile soils over free-draining carboniferous limestone in the Burren. These soils are vulnerable to water loss if hot, dry summers, as are the plants and dependent invertebrates. Photo J. Harding
There are studies concerning the link between the warming climate and butterfly declines. There are indications that a combination of climate change and pollution is damaging the habitat of the Wall Brown. Kurze et al. (2018) suggest that it is very likely that nitrogen enrichment from fertilisers is killing some species larvae on farmland while Habel et al. (2015) suggest that increased plant growth rates arising from nitrogen deposition, increased rainfall and climate warming are cooling the micro-climate at larval sites, driving declines of species that depend on nutrient-poor habitats.
Hazel bushes suffered dehydration during drought conditions on July 1, 2018. Photo J. Harding
A study that looked specifically at the Wall Brown’s decline, Impact of nitrogen deposition on larval habitats: the case of the Wall Brown butterfly Lasiommata megera by Klop et al. (2014) found that nitrogen addition to potted foodplants on which larvae were fed had beneficial effects on larval development. However, the study found the influence of nitrogen deposition on larval micro-site cooling the most likely reason for the decline: “The raised levels of green plant biomass under excessive nitrogen availability leads to an increase of both shading and green: dead ratios in the vegetation, which should be expected to result in a cooling of microclimatic conditions.”
Like Habel et al. (2015), Klop et al. (2014) believe the decline of heat-loving species “could be explained by a combination of excess nitrogen and climatic warming, with both factors enhancing plant growth in early spring and reducing the availability of warm microclimates.” Elevated temperatures at the larval micro-site, typically arising from a combination of unshaded bare patches of ground containing sparse foodplant vegetation and warm, dry, dead plant litter are critical to the caterpillar in spring when air temperatures are cool. If these findings are correct, geographical scale pollution reduction measures must be implemented along with measures to tackle climate change. If not, we could be lamenting the extinction of one of our formerly common and widespread butterflies.
However, in such a devastating context that Professor Thorne outlined, the fate of our butterflies may seem of small consequence, a trivial footnote to a doomsday of mass extinction and global crisis for mankind, with continued human existence at stake.
Thorne stated that a brief and closing window exists to secure a livable future if concerted global action takes place.
But the past decade has had the highest greenhouse gas emissions in human history.
Professor Thorne stated that technological solutions exist to produce low emissions, but investment, which is available, and leadership, are needed.
How, then, did the cabinet committee react to Thorne’s presentation? A few polite questions later, the ministers began to discuss sectoral contributions to emission reduction targets. The Irish Government reacted by producing, according to the Environmental Protection Agency (EPA) report published three weeks (May 31, 2022) after the briefing, an emissions policy that adds up to 28% of greenhouse gas (carbon dioxide, methane, and nitrous oxide) reductions by 2030, not the required 50%.
When RTE’s HOT MESS programme sought an interview with any of the ministers who attended the briefing, no minister was made available.
Before we blame the Government, let’s look at ourselves. Do you want to sell your second car, get rid of your beloved SUV, pay higher taxes, and pay more for food?
I doubt it. But politicians need to lead public opinion, not follow it. Opportunities for leadership exist. Jim Hacker, the fictional minister in the British comedy, ‘Yes, Minister’, when asked to defy public opinion for the good of Britain, responded, “I am their leader. I must follow them.”
No more of that.
Policies that are unpopular now, will become more popular, over time, as people realise how crucial they are. Let us act so we don’t run out of it.
Limestone grassland in the Burren, June 29, 2018. The heterogeneity of these grasslands is threatened by the predicted hotter, drier summers predicted to be the norm by 2050. Photo J. Harding
Habel, J., Segerer, A., Ulrich, W., Torchyk, O., Weisser, W., and Schmitt, T., (2015). Butterfly community shifts over two centuries. Conservation Biology, Volume 30, No. 4, 754–762, accessed 28 December 2020, https://conbio-onlinelibrary-wiley-com.jproxy.nuim.ie/doi/epdf/10.1111/ cobi.12656
Harding, J.,(2021) The Irish Butterfly Book, privately published, Maynooth.
Klop, E., Omon, B. & Wallis DeVries, M.F. (2015) Impact of nitrogen deposition on larval habitats: the case of the Wall Brown butterfly Lasiommata megera. Journal of Insect Conservation 19, 393–402. https://doi.org/10.1007/s10841-014-9748-z
Kurze, S., Heinken, T. & Fartmann, T. Nitrogen enrichment in host plants increases the mortality of common Lepidoptera species. Oecologia (2018) 188: 1227. https://doi.org/10.1007/s00442- 018-4266-4
A view from the summit of Mullaghmore, Burren National Park, County Clare.
Our Burren outing began at 10 am when we gathered at the unofficial car park at the crossroads in the Burren National Park. The sky was grey, streaked with pale, fearful blue but the air was still, with a hint of warmth. Perhaps we would be lucky.
Following introductions, we over-stepped a low Burren wall and entered the area north of the road, where limestone pavement, open grassland, and scrub are beautifully flower-rich, with the heavily sweet influence of Fragrant Orchid flavouring the breeze, imbuing the atmosphere with alluring exoticism. To be there at this time of the year is to step into a dream world. August may be seen as summer grown old, a little wrinkled from its long exertions, frayed and browning, the glowing bloom of earlier days thinning and paling, paradise lost. The grasses are tinged with oatmeal, the light lower, sharper, flowers bedraggled.
Burren Green moth is found only in the Burren, and nowhere else in Ireland or Britain.
The jaded look is challenged by the arrival of freshly hatched butterflies, especially our latest butterfly to take flight, the Brown Hairstreak, our main priority for this day. The Brown Hairstreak is the last Irish butterfly to emerge each year. Speckled Wood-sized, it is a most elusive species, common nowhere in Britain or Europe. Ireland has most of its brown Hairstreak populations in the Burren, with scattered presences in west Tipperary, south Galway, and in Mayo near Lough Corrib. But it is not easy to find, especially where tall oak trees occur, for the more active males tend to occupy tree-tops, rarely descending. The Burren has fewer tall trees, and very few oaks so we do see males at eye level, feeding on nectar, rather than aphid secretions on oak leaves.
The Brown Hairstreak is quite tame, especially in cool weather.
Females are especially richly coloured with warm orange-brown undersides, while males usually look paler. Males are more active, jinking around the canopy, especially in the mornings, seeking newly emerged females. Mated females and males spend the long afternoons feeding on bramble and tall hedge side Creeping Thistles.
A female Brown Hairstreak suns herself on a hazel leaf.
The overcast weather was against us, because the hairstreaks typically perch quietly on tall scrub, typically on hazel in the Burren. Before we reached likely habitat, we noticed the large population of fresh-looking Meadow Browns, sharply different from the diminished populations in the east, now in rapid decline, their life’s work already done. Common Blue, Small Copper, Ringlet, Grayling, and the occasional Small Heath were encountered in the tall sward.
Small Copper warming itself on limestone.
The scrub patch identified in previous years as a good source of Brown Hairstreak sightings was searched. Nothing at first but high up one was seen, restless around the canopy before settling, wings ajar, on hazel. We failed to coax it to land lower down, but at least we knew they remained faithful to their patch. “If it brightens up, and you’re still around, you should find more here.” I learned that this is what some of our group did in the afternoon when the sunny weather appeared. A female was also found later, and they are rather lovely, in their tame, quiet, approachable way.
The intricate patterning on the True Lover’s Knot is a delight to observe. This moth occasionally flies during the day.
Later we crossed the road, finding another traditional haunt and another, less camera-shy male, who did fly down to feed on Creeping Thistle. A male Vapourer Moth was seen and photographed close by, a nice addition to the Burren Green and True Lover’s Knot moths caught the night before and shown to our group.
The resting Common Blue blends well with the Wild Carrot blooms.
We later returned to our cars, for refreshments, and positive feedback on our outing. A great thank you to all who joined our outing, some having made long journeys to share an experience with nature. May the sights we saw live on in our memories, and may the amazing Burren continue to hold its amazing depth and range of wilderness and biodiversity.
A Burren Grayling resting on a rock. The species is abundant here during August.Mountain Avens Dryas octopetala is a lovely arctic-alpine flower. It blooms again in late summer after flowering in May. This photo was taken on Mullaghmore, where this dwarf shrub is abundant.
Some years ago, a gardener told me she was enjoying the butterflies in her garden. It was early in a sunny September, and a range of butterflies flapped their vibrant wings around the nectar-filled blooms in her compact, warm sun-trapping garden. Did she grow any plants to encourage the butterflies to breed?
No, came the emphatic answer. She hates caterpillars.
But you cannot have butterflies without caterpillars.
No, she still didn’t want them.
The clarion call to save biodiversity is a cry that meets with broad public support nationally and internationally. Yet for many people, conservation is something that happens somewhere else. It is not. It is everyone’s responsibility. Covering your garden with artificial grass, tarmac, concrete, and cobbles do little to save nature.
Mowing your garden every week is damaging to the prospects of most wildlife and yet it is an endemic practice in Ireland, the UK and much of Europe. Yet many of the same people, if asked, would claim to care about nature.
Just as you cannot have the butterfly without the caterpillar, there is no biodiversity without a loving and hospitable home for our wildlife.
For most people, including butterfly and moth lovers, the larvae are rarely seen. But in some cases, the larvae are extremely interesting and very beautiful. Here we show a selection of butterfly and moth caterpillars and tell you a little about them.
All photographs J.Harding except Alder moth F. Parnell.
A Cinnabar moth caterpillar on Common Ragwort. This is one example of a highly conspicuous caterpillar and is easily the most reported caterpillar. This larva feeds in groups when younger, and their brash colouring warns predators of their toxicity. The caterpillars absorb toxins from the foodplant which contains pyrrolizidine alkaloids which are fatal to livestock and humans if absorbed in sufficient quantity. This appears to make the larva distasteful too, and birds learn to avoid the caterpillar. Common Ragwort and Marsh Ragwort are native plants, important for pollinators, but the plant should never be allowed to grow in hay meadows where hay is used to feed livestock. The Cinnabar moth controls Common Ragwort, eating the flowers before seed can form.Next is a green caterpillar, the larva of the Green Hairstreak butterfly. This one is feeding on Bilberry, a bog and heath plant. The larva is well hidden on its foodplants and is very hard to find in the wild. It pupates in summer and the adult emerges the following spring and summer. The larva is stated to be cannibalistic but it has been reared collectively in captivity without any fatalities.Another green larva, the Cryptic Wood White, relies on camouflage to be undetected by birds. It lies flat against the stems of its foodplant, especially Meadow Vetchling, adding to its blending ability. This caterpillar is also remarkably hard to locate. Eggs are usually laid singly, meaning the larvae are well dispersed, presumably allowing the species to avoid predation. Larvae that blend with their food are typically edible.Time for something exotic! This is the larva of the Common Swallowtail butterfly on Common Fennell growing against a limestone rubble wall in Gozo, Malta. The butterfly is rarely seen in Ireland but is a possible future colonist. The fleshy protuberance is an organ called the osmeterium, extended when the caterpillar experiences a threat. The organ emits a sour smell of rotting pineapple to deter predators. Strangely, this organ does not appear to be used by the larva in its final growth stage.The Tussock moths produce wonderfully flamboyant larvae, and the Dark Tussock, a bog moth, is one example. It feeds on heather and sometimes gorse. Its dense covering of bristles must be unappetizing to Meadow Pipits, a bird frequent on bogs.The Pale Tussock moth caterpillar is more widespread and even showier. This species breeds on birch, oak, apple, hazel, limes, elms, Common Blackthorn and Common Hawthorn. The larva is usually seen in late August and September when it appears on or near the ground when it leaves the tree to pupate among debris on the ground.The Vapourer moth is another member of Lymantriidae, the tussock moths. In Victorian England, a Vapourer was the name for a braggart or boastful person, and this larva certainly boasts extravagant outline and livery. The larva feeds on willows, Bog-myrtle and the same trees used by the Pale Tussock.We don’t have the iconic Purple Emperor butterfly in Ireland but we do have the Emperor Moth, a beautiful bogland, heathland, fen, mature dune, and scrubland inhabitant. The newborn larvae are black, resembling miniature Peacock larvae, but colour changes eventually culminate in the form you see here. This species uses a range of foodplants. In Ireland, it has been recorded on birches, Alder Buckthorn, willows, and heathers.A clouded Yellow on Common Bird’s-foot-trefoil. The butterfly appears in Ireland every year but not in abundance, except in some special years, like 2000. It is very common in Southern Europe, emerging in early April in Tuscany and probably earlier further south.The Narrow-bordered Bee Hawkmoth is a day flyer, and very popular among nature photographers. The caterpillar feeds on Devil’s-bit Scabious, and its apparently unnecessary purple markings make sense if you see the foodplant, which often contains dark purple blotches on the leaves and purple on the flowering stems. Like the other hawkmoth species, the caterpillar has a tail.The Lackey moth belongs to the family Lasiocampidae, the Eggar moths. It breeds on a number of trees, especially Common Hawthorn, and is mainly southerly in its occurrence in Ireland. The larvae feed in large groups and bask on webs, which can be large and conspicuous. Like many moths with colourful larvae, the adults are rather cryptic. The adult Lackey is usually straw-coloured and nocturnal.The Small Eggar is rare in Ireland, despite having common foodplants like Common Hawthorn. This photo was taken in the Burren, near Carran, on open limestone with scattered scrub. It overwinters as a pupa, sometimes for two or three winters before the adult moth emerges. The adult flies early in the year, from January to March.This is the larva of the Narrow-bordered Five-spot Burnet moth, a black moth with red spots on the forewings’ upper surfaces. The larva feeds on Meadow Vetchling growing in a tall sward, often on damp soils. The moth, both in the larval and adult stage, is easily confused with a much commoner species, the Six-spot Burnet, which is abundant on dunes in summer.The colourful larva of the Sweet Gale moth belies the subdued, grainy grey adult’s colouring. Oddly, this moth has two generations a year in Ireland but just one in Britain. It feeds on Sea Plantain, Ribwort Plantain, Sea Campion and woody plants like heather.The caterpillar of one of Ireland’s rarest butterflies, the Pearl-bordered Fritillary, is feeding on Common Dog-violet in the Burren, County Clare. This larva leaps off its foodplant when it wants to bask, landing impressively on its feet. Like many larvae that develop in early spring, it spends long periods basking in the sun on dry vegetation while it digests its food. It also appears to use its basking site as a latrine.The Knot-grass is another dull moth with a colourful larva. It has a range of foodplants, including Meadowsweet and Devil’s-bit Scabious. This one has coiled into a ring, a typical defensive pose for a disturbed larva.Like the Pale Tussock larva, the handsome larva of the Alder moth is usually seen when it leaves the foodplant (Alder, birches willows, oaks) to pupate in rotten wood on the ground. Photo by Fionnuala Parnell.The Dew moth is an orange-yellow black-speckled day and night flyer that can be seen in the Burren in May, June and July. The caterpillar feeds on lichens growing on rocks.A Comma butterfly caterpillar on Common Nettle. The species include Hops, elms and willows in its diet. Since the larva was first recorded in Ireland on 17th May 2014 in Carlow, the Comma has been recorded breeding in several counties, including Wexford, Wicklow, Meath and Dublin. It has recently been recorded breeding in Irish gardens and appears poised to colonise the entire island.
ULYSSES: The heavens themselves, the planets and this centre
Observe degree, priority and place,
Insisture, course, proportion, season, form,
Office and custom, in all line of order…
But when the planets
In evil mixture to disorder wander,
What plagues and what portents! what mutiny!
What raging of the sea! shaking of earth!
Commotion in the winds! frights, changes, horrors,
Divert and crack, rend and deracinate
The unity and married calm of states…
O, when degree is shaked…
Take but degree away, untune that string,
And, hark, what discord follows! each thing meets
In mere oppugnancy: the bounded waters
Should lift their bosoms higher than the shores
And make a sop of all this solid globe:
Strength should be lord of imbecility,
And the rude son should strike his father dead:
Force should be right; or rather, right and wrong,
Between whose endless jar justice resides,
Should lose their names, and so should justice too.
Troilus and Cressida William Shakespeare (Act I, Scene III, 85-118, edited)
Interfere with nature and chaos follows. Order, security, justice and our very sense of right and wrong are at risk in a context dominated by a greedy, stupid, and self-defeating consumerist mentality where personal gain and the demand for constant economic growth is the all-consuming imperative of the global financial architecture. Like pigs at the trough, we gorge unsustainably on what is bad for us oblivious of our contribution to our impending downfall.
The signs of chaos are here already. Temperatures are soaring throughout Europe, America, and India with heat waves now hotter, more frequent, and longer lasting. The UK recorded temperatures above 40C for the first time on 19 July. The record temperatures in the UK last week would have been “almost impossible” without human-induced climate change, leading scientists have concluded. Reaching 40C is regarded as an event that is still rare in Britain that we would “expect (them) between once every 500 years and once every 1,500 years.” (https://www.bbc.com/news/science-environment-62335975)
Posturing, with ecological and climate rectitude the ostensible priority of our age, will not repair the damage. Recently Padraig Fogarty of the Irish Wildlife Trust told RTE’S Claire Byrne that Ireland has no natural habitats left. Aghast, she exclaimed “What?” Fogarty pointed out that the last natural habitats we had, our bogs, have been destroyed.
Out of necessity, the Irish Government announced a rewetting programme for the minority of bogs in semi-state ownership in 2020 (https://www.irishtimes.com/business/energy-and-resources/bord-na-mona-ends-all-peat-harvesting-1.4459179).
Exploit and destroy the bogs, then greenwash them in peatland rehabilitation. For anyone reading this, ‘rehabilitation’ won’t happen. Many of the bogs taken out of production are still being cut by people claiming turbary rights. Re-wetting, the method to be used, will not restore the peatlands we lost unless we wait for a thousand years or longer, and we continue to receive rainfall levels and climatic conditions that built bogs. Bord na Móna, which is charged with rewetting, admits that the bogs will not be returned to their pristine state:
It is not expected that the site (a reference in most if not all of the rehabilitation plans) has the potential to develop active raised bog (ARB) analogous to the priority EU Habitats Directive Annex I habitat within the foreseeable future (c.50 years). Furthermore, only a proportion of the bog has potential to develop Sphagnum-rich habitats in this timeframe. Nevertheless, re-wetting across the entire bog, as part of the proposed Scheme, will improve habitat conditions of the whole bog, making the overall bog wetter. Other peatland and wetland habitats such as fen, wet woodland, Reed Swamp and embryonic Sphagnum-rich vegetation will develop in a wider mosaic that reflects underlying conditions. It will take some time for stable naturally functioning habitats to fully develop…(Bord na Móna, Belmont Bog Cutaway Bog Decommissioning and Rehabilitation Plan, p.31)
The bogs in Ireland developed over 10,000 years. Whatever habitats develop on re-wetted peatlands, these will not be active (growing) raised bogs. Under the EU Habitats Directive the National Parks and Wildlife Service (NPWS) is obliged to complete a report every seven years on the condition of designated habitats. In 2019 the NPWS rated the prospects of the protected raised bogs it assessed as BAD in terms of range, area, structure and functions. The overall assessment of conservation status and the overall trend is BAD. (https://www.npws.ie/sites/default/files/publications/pdf/NPWS_2019_Vol2_Habitats_Article17.pdf)
These assessments only apply to the small number of legally protected sites, so given that the report lists ongoing burning, peat extraction, drainage, afforestation and temperature changes arising from climate change, the situation will deteriorate. One strategy to save protected raised bogs has been to relocate peat extractors…to other raised bogs.
Another idea is to conduct “investigations to establish if turf cutting is feasible within circumscribed parts of a limited number of SACs (the legally protected bogs) without impacting on the integrity of the site.” (National Parks and Wildlife Service, The Status of EU Protected Habitats and Species in Ireland Habitat Assessments Volume 2 pp 742-3)
There are more ingenuous ideas to save our bogs in the document for anyone with the resilience to read it.
Less than one percent of Ireland’s midland-raised bogs are in a natural state and growing peat. In other words, over 99% are in various states of degradation, releasing carbon dioxide, a warming gas, into the Earth’s atmosphere.
And anyone who thinks that recent publicity concerning restricting the burning of turf has engendered improved conservation will be disappointed. Peat cutting continues, throughout Ireland, on raised and blanket bogs. Advertisements for turf for burning are widespread, such as the one I saw recently opposite the Garda station in Bandon.
One of the bitterest ironies is that peatland destruction can make it hard to enjoy the nature we still have. The Marsh Fritillary, our only legally protected insect is a beautifully patterned species, with brick red, cream, yellow and black upper sides. Seeing this sylph-like creature should be a delight, but its presence is frequently indicative of environmental degradation, because this butterfly, which does not live on wet intact raised bogs has colonized the degraded bogs. Over a short few years, these breeding sites disappear as scrub and woodland take hold.
It is perhaps somewhat ungrateful to interpret the presence of a threatened and beautiful butterfly as indicative of habitat loss, but ecologically this is correct. The butterfly can make use of new suitable habitats within its reach, but the species cannot use these transient areas for long-term survival. Before the bog was destroyed, the butterfly probably occurred in more stable habitats in the lagg zone, a transition zone along the outside margin of a raised bog, characterized by a fen or swamp plant community and adjoining wet grassland.
Our aesthetically atmospheric, wild cooling wetlands absorb and retain carbon dioxide. They hold great biodiversity. They must be cherished, not drained and burned. Woods are said to be good for our environment. Eco-lies exist, with statistics used to assuage concern. We are told that there is more forest in Ireland today at 11%forest cover than 200 years ago. This information suggests these are Irish woodlands. They are not.
They are crops, often planted on peatlands. Instead of planting native trees in the correct places, we are disfiguring the landscape with ugly, uniform conifer plantations. These are dark, miserable, depressing, and largely lifeless, with the only sound being the wind soughing bleakly through the trees. Lest anyone think these trees on peatlands help to retain damaging warming gases, consider this statistic from the Environmental Protection Agency Report:
In light of future climate change, the most important function of peatlands in the 21st century is that of a carbon store and sink. Covering only about 3% of the Earth’s land area, they hold the equivalent of half of the carbon that is in the atmosphere as carbon dioxide (CO2) (Dise, 2009). It is estimated that the carbon stored in peatlands represents some 25% of the world soil carbon pool (i.e. 3–3.5 times the amount of carbon stored in the tropical rainforests) (EPA, Bogland: The Sustainable Management of Peatlands in Ireland, p32).
The report gives a good indication of the damage to peatland by afforestation:
The national forest area has dramatically increased in Ireland since the 1950s and a third of it (some 267,000 ha) has been planted since 1990 (classified as ‘Kyoto forests’). According to the Forest Service National Forest Inventory (NFI), 43% of the total forest estate is located on peat soils (Black et al., 2008). Most forests on peatland in Ireland are located on blanket bogs (both mountain and Atlantic), with a small proportion occurring on either raised or on industrial cutaway bogs. While large tracts of natural blanket bogs were afforested between the 1950s and 1980s/90s, the last decade has also seen the afforestation by private landowners of smaller areas of blanket bogs – most of which are likely to have been degraded to some extent by previous human activities (turf cutting, animal grazing). (EPA, Bogland: The Sustainable Management of Peatlands in Ireland, p76).
The way of operating especially by smaller landowners is to destroy the bog and plant alien conifers on the peat soils. When the crop is ready, the clear-felling often used creates a further rise in carbon dioxide emissions.
Ireland and the world have choices to make, as has every individual. The choice is mass extinctions, global instability, and ensuing chaos from following the business-as-usual model or change to repair what we can repair. There is an order in nature. We are disrupting this order, making ourselves vulnerable.
Wake up and smell the carbon before the last Curlew calls and before the last Wall Brown butterfly presses golden wings against a warming surface. May we continue to enjoy the wonders of the natural world, reflected in the Peacock butterfly’s starry neon-bright eyespots.
We need to change. It’s later than you think…
The Peacock butterfly’s eyespots have long fascinated observers: The eyespots “shine curiously like stars, and do cast about them sparks of the colours of the Rainbow.” Sir Theodore de Mayerne, 1634.
To date, July 2022 has produced some dull, overcast weather and a few days of extremely hot, but not uniformly sunny conditions. In June, the percentage of long-term average sunshine values were variable across the country. The percentage of monthly sunshine values ranged from 82% (monthly sunshine total of 128.4 hours) at Shannon Airport, Co. Clare to 104% (monthly sunshine total of 166.4 hours) at Casement Aerodrome, Co. Dublin.
Direct sunshine is important for some of our day-flying moths and butterflies. Moths like the Least Minor Photedes captiuncula ssp. tincta and Forester Adscita statices and butterflies like the Brimstone and Comma fly only or mainly in bright sunlight. In dull weather, these species remain hidden.
Comma dark form male, 22 July 2022, Lullymore. J. Harding.
One of our most attractive high summer butterflies is a woodland butterfly and our largest native species. The Silver-washed Fritillary, named for the silver wash makings across moss-coloured hindwing undersides, is a flamboyant, characterful and handsome butterfly, and is widely but locally distributed throughout Ireland, haunting woods comprising mainly native trees with a high percentage of sunlight penetrating down to the woodland herb layer, where the butterfly must be able to find its breeding plant, the Common Dog-violet.
A delight on the wing, males are especially frenetic movers in bright sunshine, dashing jaggedly and powerfully over wood edges and glades before dipping down and apparently vanishing. A careful approach often brings a view of the male on pink bramble blossom, a sweet contrast with his hot orange uppersides.
The onset of dull conditions or light rain will set him off to the tree-tops, where roosting takes place, and his slivery green hindwing underside blends with the silver, watery sheen of wet leaves.
The female is more heavily spotted on her uppersides, and is duller overall, with more subdued colouring. She is often, although not always, larger than the male, with the wing spanning up to 80 mm. She is more circumspect in her habitats, avoiding heavily used feeding areas once she has mated, and less dramatic in her flight, although very capable of making flights across unwooded terrain in her search for new breeding grounds. When ready to lay eggs, she enters the dimly-lit areas of woodland, leaving the sun-filled clearings to search for violets growing near trees. When located, she flies upward to a tree trunk and lays her eggs, typically, or always, singly.
The caterpillar over-winters on the tree without feeding on anything aside from its eggshell. Eight long months later, he descends to the violets his mother located, and begins to feed.
The Silver-washed Fritillary was featured on RTE Radio 1 last Monday, 18 July, on the Mooney Goes Wild Show. A must-see butterfly, the newly emerged male seen perching in bright sunshine is a summer jewel. The peak of its flight season may vary according to the locality, but late July and early August are great times to look.
Good places to search can be found by entering ‘Silver-washed Fritillary’ as a search term on our Records page: for 2022 records, see https://butterflyconservation.ie/wp/records/2022-2/
For its seasonal topicality, its popularity among butterfly lovers and its magnificent flight and beauty, we offer him to you as The Butterfly of the Month.
Silver-washed Fritillary male, 22nd July 2022, Lullybeg. Photo J. Harding.Silver-washed Fritillary, male underside, 26 July 2020, Lullybeg, J. Harding.
A male Silver-washed Fritillary on Wild Carrot. The black bars of the forewings and deeper orange distinguish the sexes in this species. Females are duller and lack black barring.Green-veined White on vegetation. In warmer countries and probably in warmer summers in Ireland, females will mate more than once.Ringlet on Common Spotted Orchid. The Ringlet and Silver-washed Fritillary feed on this flower. The Ringlet can be very abundant in tall, humid grassland growing near woods, or among scrub.Narrow-bordered Bee Hawkmoth larva on Devil’s-bit Scabious. There were three larvae on a large plant. The adult moth had a good year on the Butterfly Conservation Ireland reserve at Lullybeg, in County Kildare.A male Dark Green Fritillary feeds on Marsh Thistle on Lullybeg Reserve, County Kildare.Purple Hairstreak female on an oak leaf containing its nourishment, an aphid’s secretions. This has a sticky texture and sweet taste. It also provides camouflage to the butterfly which has silvery undersides that blend in with the silvery glare the secretions emit in bright sunshine.The Meadow Brown has a long flight period that peaks during July in parts of the east and midlands and during August, sometimes in mid-August, in parts of the west of Ireland.
All photos J. Harding
Early July and late July are quite different in the butterflies on view. Later in the month, the Brimstone, Wood White, Large White, Small White, Small Copper, Brown Hairstreak, Holly Blue, Peacock and Grayling join the species highlighted here. July has more species on the wing than any other month.
Butterfly Conservation UK has recently produced a new Red List for Britain’s butterflies, and the news is not very good.
The declines reported by the Red List authors are linked mainly to habitat loss, not climate change. But climate change is playing a negative role in the fortunes of more northerly species.
Head of Science for Butterfly Conservation, Dr Richard Fox, says: “Shockingly, half of Britain’s remaining butterfly species are listed as threatened or Near Threatened on the new Red List. Even prior to this new assessment, British butterflies were among the most threatened in Europe, and now the number of threatened species in Britain has increased by five, an increase of more than one-quarter. While some species have become less threatened, and a few have even dropped off the Red List, the overall increase clearly demonstrates that the deterioration of the status of British butterflies continues apace.”
While land-use change remains the most important driver of decline, the impact of climate change on butterflies is also evident in the new Red List, with all four British butterflies with northerly distributions, adapted to cooler or damper climates, now listed as threatened (Large Heath, Scotch Argus, Northern Brown Argus) or Near Threatened (Mountain Ringlet).
Britain currently has 59 species (the Red List assessed 62 species, 4 of which are assessed as extinct, although one of these, the Large Tortoiseshell, has been recorded breeding this development occurred after the assessment for the Red List). The List covers Britain only, not the UK as a whole. Disturbingly and perhaps presciently for Ireland’s butterflies, some of the species we have become more concerned about have been uplisted on the Revised Red List of British Butterflies.
The Large Heath ranked vulnerable on the Irish Red List (2010) has been up-listed from Vulnerable to Endangered on the British list. The Grayling ranked Near Threatened in Ireland, has been up-listed from Vulnerable to Endangered on the British list. The Small Heath ranked Near Threatened here, has moved from Near Threatened to Threatened on the British list.
The most disturbing assessment concerns the Meadow Brown, assessed as Least Concern. However, this finding is, to my mind, dubious. The species has shown a major increase in the rate of decline over the period of the assessment (2010-2019) but is assessed as Least Concern because of the potential for a rescue effect, with the British population having the potential to receive influxes from Ireland and Europe.
The Meadow Brown is not the universally common butterfly it was once. Photo J. Harding
This assessment makes little sense if the decline is attributed to land-use changes. The habitat does not become suitable for the species simply by receiving immigrant Meadow Browns. A mathematical model shows a projected decrease of 28% (2013-2022). The assessment must apply the International Union for the Conservation of Nature (IUCN) process for assessing the status of species, but this should set alarm bells ringing shrilly.
The decline of such a widespread, undemanding habitat generalist suggests widescale environmental degradation. The Victorian Lepidopterist C G Barrett wrote that there is “hardly a grassy field in the United Kingdom from which it is wholly absent.” This is not the case today, for Britain or Ireland.
In better news, conservation measures have helped to improve conditions for the Pearl-bordered Fritillary in Britain which has moved from Endangered to Vulnerable. However, these conservation measures must be ongoing, because this butterfly requires a determined programme of scrub control and rough grazing for its survival in many regions. In Ireland the 2010 Red List ranked this species as Endangered, applying the precautionary principle because the butterfly has such a restricted distribution here, occurring only in the Burren and close to the Burren.
The Pearl-bordered Fritillary is responding well to conservation measures in Britain, showing that declines can be tackled. Photo J. Harding
The Wood White, ranked Near Threatened here, remains Endangered in Britain. This species occurs mainly in the Burren and in other areas containing exposed Carboniferous limestone, in scattered locations from just south of Ennis to southern areas of County Mayo.
How are butterflies dealing with land-use changes and climate change on the continent? Broadly, in northern Europe butterflies are in trouble while in southern Europe populations are more stable. Woodland species are doing considerably better than grassland species.
A female Purple Hairstreak basking on an oak leaf coated in aphid secretions. Woodland butterflies are doing better than grassland species. Photo J. Harding
The European Grassland Butterfly Indicator is based on the national Butterfly Monitoring Schemes (BMS) in 19 countries across Europe, most of them in the European Union. The indicator shows that from 1990 to 2011 butterfly populations have declined by almost 50 %, indicating a dramatic loss of grassland biodiversity. This also means the situation has not improved since the first version of the indicator was published in 2005. Of the 17 species that the Indicator assessed, eight have declined in Europe, two have remained stable and 1 increased. For six species the trend is uncertain.
The eight species that showed declines were (species that occur in Ireland in bold) Small Heath, Wall Brown, Small Copper, Dusky Large Blue, Meadow Brown, Common Blue, Marsh Fritillary, and Large Skipper.
From Seville and Cordoba comes the startling news that Common Swift Apus apus and Pallid Swift Apus pallidus nestlings are being killed by extreme heat or when attempting to escape the extreme heat. Hundreds of nestings are being found on pavements, near death. Great tit chicks in Montpellier are starving to death because their parents cannot forage in 45-degree heat.
These are cavity-nesting birds, which often breed in cultural environments such as cities, parks and gardens, making the effects of extreme heat easily observable.
We might be missing what is going on elsewhere and to less conspicuous wildlife, like our moth species.
Apart from drastic global action needed to reduce emissions of greenhouse gases, we need to protect landscapes, like the Burren, to buffer the effects of a warming climate. Bog restoration, grassland restoration, native woodland restoration would also help.
One step you can take right now to express your support for our wetland habitats is to sign the petition in support of the establishment of the National Peatlands Park in Northwest Kildare and East Offaly. The petition is being run by No Planet B, a dedicated group of young environmentalists, ably led by Butterfly Conservation Ireland member Niamh Cowdell. The petition is here: https://chng.it/hYm7vfJjJT