Egg laying at Grafton Wood (thanks to clearance work)

I was very impressed with the results of the shrub clearance near the old pond area. I saw 7 Brown Hairstreaks, today, all either in the old pond area or along the path to the west of the pond. Two of the females were definitely egg laying, however, in the area cleared either last year or the year before, opposite the pond. All the low flying, egg laying females were in this cleared area.

I think I have been missing a lot of sightings by looking around the area of blackthorn next to the pond, when most of the action is opposite the pond in the cleared area on younger blackthorn plants. The female below disappeared low in the blackthorn and I found two eggs, afterwards.


Most of my sightings were between 12.30 and 14.00pm. It was very windy, but they were active during the short spells of sunshine. I photographed four different females on the day. All in all, a very good day. I did notice that there was a lot of trampling in the cleared area. There are a couple of small "paths" through this area so please try to avoid trampling on the blackthorn saplings. Many thanks.




Early days at Grafton Wood

I read on the Grafton Wood blog that the first Brown Hairstreaks (including females) were seen on August 4th. I arrived last Sunday on a warm, sunny but windy day, feeling very hopeful of early season sightings. I walked the main rides for 3 hours, seeing a particularly strong showing of Gatekeeper, Brimstone and Silver Washed Fritillary. I was surprised that, although I saw 5 Purple Hairstreak (even on the ground), I did not see a single Brown Hairstreak in flight, at all, including around the pond area. My only observations were of two females, low in blackthorn, on the west side of the wood, either basking or nectaring on bramble.
Fortunately, one of the females was very photogenic and posed in virtually all the positions I wanted :-) for two minutes; then she was gone. There is something very special about our rarer woodland species. They spend most of their brief lives high in the canopy, rarely, if ever, descending so that we can fully appreciate their beauty. It is the fruitless hours or days that we spend travelling to, and searching these sites in vain, that makes these brief glimpses so very rewarding.

Any sightings yet

Anybody seen one of these yet. As the Purple Emperor season winds down, attention turns, hopefully, to Brown Hairstreak. I noticed on the Purple Empire that Brown Hairstreak were flying at Knepp, last week. As it is a long drive to my nearest site (Grafton Wood), I wondered whether they were out anywhere else yet. Many thanks.

Annual Transect Egg Count at West Williamston, Pembrokeshire

West Williamston’s annual egg count this year was carried out by 15 enthusiastic volunteers on a damp, grey Pembrokeshire day.  Travelling from all over south Wales.  The team also welcomed several new ‘hairstreakers’. 

The total number of eggs found was surprisingly high compared to reports of lower counts from other areas.  Blackthorn management has continued to be carried out on a rota basis by Nathan Walton, WTSWW officer and his volunteers, and it is worth noting that the areas where eggs laid were most concentrated correlates directly to the areas where most males were seen during August and September.

Aerial GPS locations of 2015 Brown Hairstreak eggs found along the foreshore transect (and beyond) with thanks to Stephen and Anne Coker

West Williamston SSSI Annual Brown Hairstreak Egg Count 
Sunday December 6th 2015. 
Area
No
Volunteers
Blkthorn status   previous year
Blackthorn management
000 - 025
37
 Steven,  Anne,  Sarah & Gerry
v good

025 - 050
91
      “         “          “            “
v good

B Glade
56
      “         “        
V good

B Glade 2nd
10
      “         “         
  ok

050 - 075
32
      “         “          “            “
 good

075 - 100
27
      “         “          “            “
  good






100 - 125
16
Richard, Paul, Alan and Chiara
poor

125 - 150
20
     “        “         “           “
poor

150 - 175
20
     “        “         “           “
ok

175 - 200
32
     “        “         “           “
good

Bracken Patch
2
Richard and Paul
ok






200 - 225
66
Madeleine, George, Alan
v good

225 - 250
32
                          
v good

250 - 275
01
      “     “     “       “      “
   ok

275 - 300
10
     “      “     “       “      “
v poor

Shallow Pool
03

  poor






300 - 325
02
David and John
    ok

325 - 350
02
     “           “          “           “
  poor

350 - 375
00
     “           “          “           “
  v poor

375 - 400
01
     “           “          “           “
  v poor






400 - 425
01
Nikki
  poor

425 - 450
07
     “          “         “         “
  poor

450 - 475
07
     “          “         “         “
  poor

475 - 500
08
     “          “         “         “
  poor

       Total
483
This is the total written in diary on the day, after approximately 2 hrs



NB – Stephen and Anne Coker took GPS readings for all at end of December = 494
           Last year’s transect count total (2014) was 232


Egg survival summary from 2015 at West Williamston

Realising that I haven't yet written up the results of last winter's egg survival project I am posting a brief summary now before a much more satisfactory post with the results of our annual foreshore transect last month.                                                                                                              The chosen survey site was on the north side of top field, adjacent to the reserve’s small car park

The original aim of the survey was to try to assess the number of eggs predated by ‘unknown’ predators over the winter months, in order to establish base information for future surveys, including identification of possible predators.  

The survey was begun in September 2014, with fortnightly then monthy checks.  By March 2015  40 of the established 196 eggs were missing or predated, with a further 17 eggs found without tags. (A further 100 eggs were lost under different circumstances - see below).

The overall total of eggs surviving therefore was established as 78%. 
This compares well with survival counts carried out by David Redhead in the Midlands where survival rates appear to be slightly lower, being in the region of 75%. 
Could these be possible predators?
This survey was flawed and after 2 months there was a serious problem.
  • horses that graze the field broke managed to 'predate' several eggs along with the tender twigs they were on.
  • 85+ eggs were lost when the ‘over-enthusiastic’ contractor employed to top the meadow failed to see the young tagged Blackthorn and removed them too. These numbers were not included in the 196 eggs surveyed mostly by David Redhead, in a much denser area of blackthorn inside the fence.

This is an important learning curve, and the next egg predation survey will be carried out  with tighter limits and guidelines. Loss by horse and machine were not anticipated.
Encouragingly we established that the predation/egg loss was steady over the months from October to March.   In the past one of the 3 small sample survival counts had indicated that increased predation may have taken place very soon after the earliest eggs were laid i.e. possibly taken by  Warblers. 

These 3 old studies had resulted in  a higher survival percentage than the current study – they were all in the 80% band.  

Another late Brown Hairstreak sighting in S W Wales......further to Thursday's post, yesterday, I came across another female (in fairly fresh condition) flying below us on a habitat hotspot in Cwm Hiraeth, near Newcastle Emlyn in NW Carmasrthenshire - Teifi valley, where the species still thrives, largely due to high concentration of small holdings and low penetration of modern agriculture.

Anyone, who can contribute to other request on Thursday re growing blackthorn from seed, please share with us.

Whilst working out a coppicing plan, I disturbed a Brown Hairstreak this afternoon in a deep valley in a field of one of our few remaining southern Carmarthenshire sites. We've apparently gone from 56 sites in 2006 within 15kms of Carmarthen, down to just 6 still occupied. This includes one large site, part of which we manage.

On a related matter, although coppicing to regenerate via suckering is our main tool, the owner of one of the managed sites also wants to grow his own Blackthorn from seed (sloes) in his own tree nursery, so that they can be planted out into new hedges, and is asking for any tips on germination, growing etc. Does anyone have or can point me to suitable experience/advice please. Thanks.


GRAFTON BROWN HAIRSTREAKS STILL GOING STRONG

I visited Grafton Wood yesterday for the first time since the cloudy, and hence somewhat disappointing, Open Day eight days ago. However it was a beautiful sunny day yesterday and I was rewarded with five sightings of separate female Brownies.

It was fairly chilly when I first arrived in the wood at 10:30, even though it was sunny, but it gradually warmed up and about an hour later I had my first sightings of two females in a large overgrown hedgerow, to the north of the main pond.

Half an hour or so later I bumped into Steve Williams and he told me he'd seen two females too, but in different locations to mine. We both went to investigate the area where he'd had his sightings and almost immediately found one of the females searching the blackthorn for suitable egg laying sites.
















After crawling up and down various tiny blackthorn stems, this one (presumably?!) seems to have
got confused and I watched it lay an egg on a Field Maple sucker!




Walking back towards the pond, Steve then spotted another female flying and basking on a different stretch of hedgerow. No more sightings at the pond, although I'd earlier met someone who'd seen a female in an Oak tree there first thing in the morning at around 9:30.

At about 2:15 Steve and I both decided to call it a day and walk back to the car park. However
on the way back, Steve pointed out the area where he'd had his first sighting of the day - on a hedgerow roughly halfway between the church car park and the wood. Believe it or not, within a few seconds there it was - flying out of the hedge and stopping to bask just in front of us.


This was the fifth separate female I'd seen on the day, and shortly afterwards I spoke to another guy who'd had a sighting of a female right in the middle of the wood. That one, together with the one seen early on near the pond, plus my five sightings, meant that at least seven separate female Brownies had been seen in or near the wood yesterday. Evidence that the flight season is still very much alive!

Blasted to Kingdom Come...

The Gloucestershire - Wiltshire border suffers from a foul and abusive climate...

The sun reappeared on Friday August 28th, after several days of wind and rain.  I went out streaking, of course, but struggled to see a single battered male before cloud billowed up around 10.30.  My guess is that the males have been blasted away here, though there certainly should be egging females lingering on.  

The North Wilts flight season seems to end early - the butterflies are usually gone by the end of the first week of September, after starting circa 26th July (25th July this year).  Males disappear around 20th August leaving a tail of females.  

The brevity of the flight season here may have something to do with habitual foul and abusive weather during August...

Had August been better I would have returned to Shipton Bellinger in pursuit of that elusive century...  As it is, I'm going to Knepp Wildlands in West Sussex for a few days this week.  Knepp also supports a strong population.  Watch this space...

Weather-beaten but undeterred

After a highly promising start to the season, Pembrokeshire Brownies have been battered by nine successive days of storms, wind and rain.

Saturday 29th August provided a short window for any remaining betulae to get down to business again, but in a four hour visit between 10am and 2pm, I only managed to find one solitary female doing so, although she did provide a fascinating 20 minute tutorial regarding behaviour.

Previously, I'd only ever seen females lay eggs in isolation, but this one laid two, one after the other, on the same fork of a blackthorn sucker.

The images below show this process taking place, with the two freshly laid eggs then photographed immediately after the butterfly had moved away. This individual had a deformed right hindwing which, whilst unfortunate for her (though it didn't seem to impair her flight), allowed the abdomen to be clearly seen during ovi-positing.

She was found at 1.33pm and remained in ovi-positing mode until 1.54pm when she flew out into the open field before veering back round towards the shrub line whereupon I lost sight of her.

This site really needs some fine weather over the next couple of weeks. The Hairstreaks are there (albeit in reduced numbers thanks to the storms), but they are largely imprisoned by the atrocious conditions, meaning that egg-laying is simply not on the agenda except for during rare and brief bright periods.