It's taken me almost three weeks, but finally I broke out my sieve and tray and hit the large woodchip pile that has been sitting in the grounds for several months. This was formed when two large Wych Elms were pollarded before they started dropping limbs onto cars parked below. The logs were split and stacked and the brash was reduced to this large pile of woodchips.
I gave it all of about five minutes before quitting with absolutely nothing to show for it. It just didn't seem right, maybe I needed to be in deeper, or maybe it needed to be warmer. Who knows? Anyway, I moved elsewhere which soon proved to be far more profitable
This is the smoking shelter I built for some staff last springtime, hidden away between the back of a shed and a steep earthen bank full of Scaly Male-ferns and a little bit of Bracken. At this time of year it's clearly a bedraggled mess, but in the summertime it's luxuriantly green and lovely. I figured it could be worth ragging out some of the dead stuff and shaking it over my tray
| The smaller debris that has fallen through the sieve and into the tray |
I wasn't honestly expecting a great deal in the tray, but it held a surprising number of spiders and springtails, a couple of flies and quite a few small beetles, staphylinids mostly.
| The results of just two shakes over the tray |
The brown beetles in this image are all Anthobium unicolor. The short black one bottom centre is Proteinus brachypterus. The two elongated staphs to the left are aleocharines and are well beyond my current abilities. The fly in the middle is a sciarid, the first I've ever recognised and it turns out to be a complete and utter bugger to key through. In the end I quit trying - I need higher magnification, better lighting and a greater understanding of fly morphology.
| Beautiful looking, but a nightmare to try and key through to family |
And the little black dot next to the sciarid's wingtips is a Ptiliidae, one of the featherwing beetles, rocking in at almost a whole millimetre in length. Here's a close up to prove it really is a beetle and not just a full stop
| I'm gonna have to gen det this - wish me luck... |
So, within a mere 30ft of my room, I sieved more beetles in two shakes of dead ferns than I've seen over the past three weeks put together! Clearly I need to start taking my sieving gear with me when I go out into the woods. Gonna need a bigger rucksack, that's for sure. And another storebox (or two) for the backlog of stuff I'm identifying to family level but not species. Hmmm.
Planning a bit of sieving meself, though I am hoping for slightly large beetles to have a go at! With the rains we've had over the last few months there is plenty of 'tidal' debris if I can get organised and out.
ReplyDeleteLovely. Sieving is the gift that keeps on giving. Has given me 13 new species so far this year!! I'll be back there tomorrow lunchtime for more of it. One of the piles at work is a real mix of different types of material, woodchip, pine needles, leaves and grass. Lots in there still to find....
ReplyDeleteI remember doing a woodchip pile couple of years ago and the dry top layer was barren. The warmer, wetter stuff gave up a coupe of staphs I think. I've had about 20 species from tussocks in the last month though - ground beetles, staphs (several Stenus spp.), even a new earthworm. Winter is under-rated!
ReplyDeleteI keyed a sciarid to family over the weekend and it wasn't too bad. I was using Oosterbroek's 'The European families of the Diptera' - is that what you're using? The eye-bridge was a clincher at the end and made me confident I'd keyed it out right.
ReplyDeleteIt's one of two books and an online key that I use, yep. I flew through the first half of the key no problems, but couldn't really say for sure whether the post-pronotum was bare or not and the eye bridge wasn't quite complete, but almost so. Couple of other things that I couldn't honestly and conclusively discern. Oh yeah, whether the inner apex of the front tibia had a comb of setae or not - simply need more mag!
DeleteMy belief is that the best bit of a woodchip heap is at the apex, a couple of inches down - beneath the dry outer layer, and above the permanently soggy inner core. But every heap is different, and every handful chucked into the sieve seems to yield a different set of species.
ReplyDeleteAh cool, cheers for that. Not what I would have expected, so thanks for the heads-up!
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