Saturday 5th September - Busy betulae.....
Once again I was cursing the weather forecasters when I arrived at the Pembrokeshire Brown Hairstreak site at 10.05 this morning. Light cloud was predicted until 11am whereupon skies would progressively clear. Nowhere did it suggest that rain would be falling in this part of the country but that's what I had to put up with for the first half hour here.
I dutifully did an egg count in the upper field nearest the car park and having reached 14, I noticed that by 10.50am skies were clearing and suddenly the sun came out and warmed things up considerably.
After a fruitless 20 minutes searching this first field I decided to move on down to the foreshore to see what other species were about.
Walking through the sea asters, I was delighted to once again see double figure numbers of Tortoiseshells. However, I was most surprised to encounter my first Brown Hairstreak of the day in this exposed part of the site:
I followed this individual for just over 5 minutes until she flew up over the shrub line:
I carried on wandering through the sea asters and stumbled upon a rather tatty looking female Silver Washed Fritillary. This is the latest date upon which I've ever seen this species. Here she is in company with one of the four female Hedge Browns seen:
And an image of her by herself whiling away the final days of her short life, blissfully unharassed by males:
Walking back along the blackthorn line, I spotted my second Brown Hairstreak just prior to midday. Although these butterflies are no longer immaculate at this time of their flight period, they are all individually recognisable due to the various blemishes they have acquired. The first specimen had a 'nick' missing out of the lower left hindwing, whilst this one was missing a tail:
I watched her ovi-posturing as well as basking for a good half hour:
She kept settling on fairly mature blackthorn but I never saw her actually lay an egg:
I then briefly had that wonderful moment when a second Brown Hairstreak buzzed past me whilst I was observing a different individual. This one flew up and over the shrub line straight away and was the only one I didn't get an image of. However, whilst searching the blackthorn for eggs, I spotted a fourth
betulae basking on convolvulus leaves:
I duly made my way back to the first field, but couldn't resist this Red Admiral en route:
This pristine Comma was equally irresistible:
A further search for ova disturbed a fifth Brown Hairstreak by the perimeter of the first field:
By 2pm, the clouds had evaporated and I decided to stay later than I do normally. This paid dividends, as at 2.03pm I saw my sixth and final female of the day, and I immediately recognised her as the individual I saw laying eggs last Saturday:
There was absolutely no mistaking the deformed hindwing of this female, and it made me so proud to know that she'd survived another pretty dire week of weather and avoided the myriad of predators along the way. Whilst tracking her, there were two occasions when spiders came close to her and I was ready to intervene both times to protect her. She was also the only individual of the day that I observed actually laying an egg. She eventually flew up into the ash tree at the back of the field next to the telegraph pole at 2.22pm, having first enjoyed a well-earned rest on the perimeter fence:
Six females is an excellent return at this site, and a final egg tally of 54 isn't bad either. Clearly, these butterflies have been actively egg laying in the past week as last Saturday I only found 11 ova. On two occasions I found triplets:
Just under four hours on site returned the following:
Speckled Wood 30-40
Small Tortoiseshell 15-25
Small Copper 8
Brown Hairstreak 6
Red Admiral 5
Common Blue 4
Hedge Brown 4
Large White 3
Peacock 3
Silver Washed Fritillary 1
Comma 1
I hope to pay one last visit here in a couple of weeks to do a further egg count. Given the flurry of activity recently as well as a reasonable weather forecast for next week, I hope that this count will break the 100 barrier!