The sun was out for much of the dog walk up on the plain yesterday morning but there weren’t many butterflies about. During the course of the mile or so walk to our local Special Site of Scientific Interest, the total number of butterflies seen came to: one Small White, one Meadow Brown, a couple of Small Heaths and not a single blue. It looked like most of the species that were usually on the wing at this time of year had gone. Taken out, I was assuming, by Storms “Ellen” and “Francis”. It had been a stormy week or two.
The Adonis Blues at the SSSI had faired better. There were a dozen or more that I saw flitting about on the gently-sloping top of the escarpment.
I’m guessing the Hawthorn bushes – of which there are quite a few there – would have given more shelter than on more open areas of Salisbury Plain. But wherever butterflies had ended up roosting it would’ve been pretty tough, clinging to a piece of vegetation for dear life – literally – with winds gusting to over fifty miles an hour. One can imagine they might easily have been battered by the other strands of vegetation flailing about – maybe thistles or scrub branches – or ripped from their stalk and thrown to the winds. And that would have been it. It was blowy enough in our sheltered valley at home. Up on the exposed Salisbury plain it would’ve been fierce.
On the way back to the car, I didn’t see many more butterflies – one or two – but I was pleased to see a Wall Brown that was still flying along one of the tracks.
Another intrepid survivor, it had a bit of its front left wing missing and a chunk of the right rear looked to be absent too, but it was still flying. Maybe it would find a mate with which to produce some of the next generation. He/she would have deserved it. But the chances – bearing in mind how few other survivors I’d seen – looked a bit slim. It struck me that it’s no good being the fittest to have survived if there are no others left to survive with.
Far more butterflies were about in our relatively sheltered garden, and in the adjoining field, the day before: Meadows Browns and Small Heaths, the odd common Blue and a few Green-veined Whites.
But Large Whites were the most prevalent. They were all over the place. And they all seemed to be in beautifully fresh condition.
It looked like they’d emerged that day – or very recently – and it made me wonder what had triggered it. Do their chrysalises know somehow that conditions are favourable? Are they maybe sensitive to temperature or levels of sunlight? But then again, some of the winds have been pretty warm and the skies had been clear while the wind was blowing fiercely. Could they be sensitive to vibrations caused by high winds perhaps? Is their an instinct in the dormant chrysalis that makes it wait until things have calmed down?
Whatever had caused the new generation to appear, it was like a Large White carnival: butterflies chasing each other and dancing and feasting on the nectar of flowers in our garden, and in the field too where there was a profusion of wild mint in bloom.
And what about the Adonis Blues up on the Plain? I’d comes across one male on a walk during the last couple of weeks that was about quarter of a mile from where they were normally found. Perhaps blown there by the wind? But it wasn’t the location so much as the condition of the butterfly that I found intriguing. The worst of one storm had only subsided a day or so before, and this butterfly was in pristine condition. It had to have only recently emerged, perhaps that morning.
At the time I had wondered whether this was just a lucky individual who’d avoided the storm by chance – in emerging a day or two after it – while other butterflies had been emerging and perishing in the fierce winds. Or whether this was the tail end of the Adonis Blue emergence, and there was some innate instinct that made the chrysalises that were left wait. Instinct or chance, it looked like timing was pretty much everything, as usual. Though, having said that, there was no way the butterfly – or chrysalis – could have known that another storm, Francis, was just round the corner. But then there’s bad luck as well as good timing.