Lavernock Point NR 13/05/2018

A nice sunny day at Lavernock NR brought out alot of  butterflies with Holly Blues making a good appearance, others seen were:- Large White, Peacock, Green-veined White, Brimstone, Orange-tip and Speckled Wood. Also found a Latticed Heath moth.

Beetling by the Taff

Shingle and gravel banks by rivers (or Exposed Riverine Sediments, ERS, to give them their proper name) can be rich in specialist invertebrates, beetles in particular. Many of the species also occur in other wetland habitats, but some are confined to ERS. The fauna of the Wye and the Usk is known to be very rich, the Taff less so - perhaps due to greater industrialisation and urbanisation, or maybe just reflecting difference in habitat.

I've poked around on the Taff-side shingle banks in Cardiff, turning stones to look for beetles, but haven't done anything systematic like pitfall trapping. Nevertheless, some nice species have been found which I've not seen elsewhere in Cardiff.

There is a nice shingle bank on a bend in the Taff at Hailey Park (ST139796) which was alive with the shiny blue-black ground beetle Bembidion atrocaeruleum yesterday. Bembidion is the largest genus of carabids in the UK, and often presents identification challenges, but this one keyed out satisfactorily. According to Aderyn it is the 4th most common Bembidion in Wales, and is a specialist of riverside and streamside habitats. Also present under stones were several individuals of the small but attractive click beetle Zorochros minimus - another specialist of river shoals and one which has a north-western distribution in Britain.

Zorochros minimus

Many generalist ground beetles can be found too, particulaly species prefering damp habitats. Slightly further downstream, in May 2015, I found Amara ovata, Paranchus albipes, Pterostichus madidus and Bembidion tetracolum on gravel by the Taff. None of these are thought to be ERS specialists, though some like P. albipes are wetland species found mainly by rivers and streams.

Bembidion tetracolum

At Llandaff Weir Ocys harpaloides was recorded, and in Bute Park the common generalist carabid Notiophilus biguttatus was in similar ERS habitat.

Certainly a habitat that is worth exploring...

Cosmeston Lakes. 25/03/2018

A nice bright and warm day Sunday with a few butterflies making an appearance around the park, a few male Brimstones patrolling the hedgerows with a Comma and a couple of Small Tortoiseshells enjoying the sun.

At the dragonfly pond to the left of the visitor centre there was an unwelcome guest in the form of a Terapin basking near the bank.

All around the pond there were Common Frogs looking for mates plus one or two already mating, there was a single patch of frog spawn in the pond but it looked like it had been killed off by the cold weather we have had as there was no movement from within.

caddisfly - Creigiau 10 March

First 2018 sighting of a caddisfly in the garden - attracted to the moth box last night. Grateful if anyone can point me in the right direction with this. I have attached an image of the underside as I know these are very difficult/impossible to ID without genital examination. Does this image provide sufficient detail ?