By Paul Homewood
h/t Dave Ward
From The Mail:
The changing climate means conditions in the UK may be suitable again for the return of one of Sir Winston Churchill’s favourite butterflies, experts said.
The black-veined white butterfly was once found across southern England but became extinct in the UK in the mid-1920s, wildlife charity Butterfly Conservation said.
Changes in land use were a major factor in declining populations, and once numbers were at a low ebb, a few years of bad autumn weather were sufficient to finish off the species in the UK, the charity’s Professor Tom Brereton said.
Sir Winston was a fan of the butterfly and attempted to release hundreds in the grounds of his Chartwell home in Kent in the mid-1940s, an activity that would be frowned upon today.
Studies have revealed that with climate change over recent decades, average conditions may now be more suitable for the black-veined white again, particularly in the warmer parts of southern and eastern England.
Though the butterfly can be found as far north as Scandinavia, it needs warm weather in late May and early June, with temperatures of 19C required for the adults to become really active, Prof Brereton said.
Two recent studies in parts of northern France that have a similar climate to southern England found it would be easy to recreate the habitat the butterflies need, by creating field margins rich in wildflowers and patches of scrub.
The results of the studies were revealed at Butterfly Conservation’s international symposium in Southampton.
Fabrizia Ratto, from the University of Southampton, who conducted one of the studies, said: “Our study found that the butterfly has a strong preference for small isolated bushes of Blackthorn and Hawthorn as egg-laying sites with abundant nectar sources such as red clover nearby.
“These habitat conditions can be recreated relatively easily in the UK through the implementation of agri-environmental measures such as nectar flower mixes in crop margins and by allowing some scrub regeneration beside adjacent hedgerows.”
Sir Winston is thought to have become a butterfly enthusiast during his time as a young officer stationed in India.
His plans to release the black-veined white were thwarted by his gardener who accidentally cut the nests of the young caterpillars from the hawthorn bushes where they had been carefully placed.
Before a modern attempt to reintroduce the species is made, more research is needed to see if conditions really are right for them, and whether they could withstand the increase in extreme weather events which are also the result of the UK’s changing climate, Butterfly Conservation said.
But while climate change poses a threat to many UK species, the warmer average temperatures could provide an opportunity for the black-veined white, with a reintroduction a possibility in the future.
What on earth gets into the minds of these idiots?
Butterflies thrive in warm climates, not cold ones. Apparently these little beggars were quite happy flying around in southern England, before habitat changes all but wiped them out.
Given that they are still thriving throughout most of Europe, it is clear that climate does not enter into the equation.
Butterfly Conservation then go on to wheel out the usual nonsense about the increase in extreme weather events which are also the result of the UK’s changing climate.
Yet it was extreme autumn weather that finished the species off in the UK in the 1920s.
This appears to refer to some really cold autumns in the 1910s and early 1920s. (Autumn rainfall was not unusually high at that time).
As with most species of butterflies, a warmer climate will be beneficial. It is habitat change however which is the real issue, not imaginary extreme weather.
via NOT A LOT OF PEOPLE KNOW THAT
April 7, 2018 at 04:16PM