Big Butterfly Count 2021 sees lowest ever number of butterflies recorded in Wales

Wildlife charity warns that we must act now if we are to save Wales’ butterflies and moths for future generations.

Butterfly Conservation has today released data on the number of butterflies and day-flying moths counted across the UK in this year’s Big Butterfly Count, which ran from 16th July – 8th August.

Worryingly, the decline in the number of butterflies and moths across the UK is continuing, with the overall number of butterflies recorded per count at its lowest level since the Big Butterfly Count began 12 years ago.

The nation’s love of butterflies isn’t diminishing. Despite the low butterfly numbers, and relatively poor weather, more butterfly counts were submitted than ever before. 5,911 butterfly counts were submitted in Wales – a 36% increase on 2020 and representing almost 15,000 hours of butterfly counting in gardens, parks and the countryside.

Dr Zoë Randle, Senior Surveys Officer at Butterfly Conservation said: “This year’s results show that the average number of butterflies and moths per count is the lowest we’ve recorded so far. The average number of butterflies and moths per count in Wales was down by 6% on 2020 figures. More counts are undertaken and submitted year on year, but it seems that there are fewer butterflies and moths around to be counted.”

Some of Wales’ most-loved species including the Small Tortoiseshell and Peacock butterflies dropped in numbers this summer. This was a situation repeated across the UK, with the iconic Peacock butterfly suffering its lowest numbers since 2012. The Small Tortoiseshell, once a frequent visitor to gardens in the UK, had its third worst summer in the history of the Big Butterfly Count and shows a significant long-term decline in Britain.

It wasn’t bad news for all species, with some, including the Ringlet, appearing to bounce back from their low numbers during last year’s Big Butterfly Count. However, scientists at Butterfly Conservation warn that last year’s unusually sunny spring allowed them to emerge earlier, and that 2021’s results are therefore more typical for these species.

This year’s weather has had a significant impact on butterfly and moth species, and with more climate change related extreme weather events likely, the impact on some of the UK’s most loved insects could be devastating.

Dr Randle explains: “Some of the UK’s butterflies have more than one generation per year, meaning we would see adult butterflies in spring and summer. The majority of these double-brooded species experienced their worst year since the start of the Big Butterfly Count in 2010. Weather changes are likely to be the cause of this. March 2021 was warmer than average which would have stimulated butterfly activity. However, May was very wet which will have hampered butterfly feeding and breeding. These combined weather effects are likely to have reduced the spring generation which has knock-on effects for the second generation in the summer.”

Butterflies and moths are important indicators of the health of the environment, and a decline in abundance is a serious cause for concern.

Butterfly Conservation has launched an ambitious strategy to help address the problems for butterflies and moths and be part of nature’s recovery.

Julie Williams, CEO of Butterfly Conservation, says: “The facts are clear. Nature is in crisis and we need urgent action, not just to prevent further species losses but to rebuild biodiversity.

“Since 1976, 76% of butterflies have declined in abundance or distribution, and the downward trend continues. We have come to accept that encounters with butterflies, moths and other wildlife are unusual, delightful but infrequent. It doesn’t have to be this way and through our new strategy Butterfly Conservation is pledging to halve the number of threatened butterfly and moth species in the UK, double our impact on landscape restoration, and galvanise thousands of people to create new wild spaces for nature.

“We can’t do this alone though and are urging people to join us to create a world where butterflies and moths thrive and can be enjoyed by everyone, everywhere.”

To find out more visit www.butterfly-conservation.org