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Most users ever online was 248 on Wed Dec 12, 2007 11:53 pm


Incredible abundance of Sphigina in mid-Wales

 
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sat May 31, 2008 10:11 am    Post subject: Incredible abundance of Sphigina in mid-Wales Reply with quote

Went to Pembrokeshire for a few (rather wet!) days with the family over half term, but had nice weather on Thursday (29th May) on the way back.

We stopped for lunch in a forestry picnic site in the Berwyns in mid-Wales. Having a sweep around over buttercups, tormentil, etc beside an open track through conifer, I was getting lots of hoverflies including a great many Sphegina. Quite a few of these were large yellow or piebald specimens which I expected would turn out to be S. sibirica.

Consequently, I stopped again in the next 10km square at a small stream bridge with a nice flowery roadside, again in conifer. A feature here was a small white crucifer growing in abundance. Sweeping this produced Sphegina by the net-full!

I took quite a few specimens and they turned out to be S. clunipes and S. sibirica in a ratio of 3:1. My impression was that the ratio in the field was more likely 5:1 or higher, but I was picking out the larger and more colourful specimens, so ended up with a bigger proportion of S. sibirica.

Got about 25 species in all including both Xylota florum and X. jakutorum (all from buttercup flowers) at both sites and Chrysogaster virescens at the first.
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