Lake Vyrnwy

Lake Vyrnwy

Lake Vyrnwy
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Lake Vyrnwy

  • #gotthemall

    In a recent blog, Lake Fernwy, I mentioned that I was busy looking for the 22 species of fern that had previously been recorded on the reserve and that I was still looking for a few. Well I have now successfully found all 22 species (#gotthemall) and potentially found a new species for the reserve. The final couple of ferns found were the green spleenwort and hard shield fern, both of which are associated with calcareous soil or rock. Here at Lake Vyrnwy we don’t have a lot of calcareous rock but there is at least one relatively small band of mudstone inter-bedded with limestone which is ideal for the calcareous lovely plants to grow. My potential new find is the mountain male fern, however it can be very tricky to ID and we are therefore looking to get an expert to confirm its identification.
    Green spleenwort by Gavin Chambers
    Late summer has seen an increase in insect life with lots of late flowering plants emerging such as knapweed, devil’s bit scabious and heather (both ling and bell heather) which certainly adds a lot of colour to the uplands. Butterflies seen have included: peacock, red admiral, green-veined white, larger skipper and the not so common, at Lake Vyrnwy at least, common blue which looked stunning feeding on a knapweed while I didn’t have a camera to hand! Bumblebees, solitary bees, wasps, hoverflies, moths and a whole host of other insects take advantage of what will be potentially their last decent nectar source before they sadly die or go into hibernation.
    Ling (lilac flowers) and bell heather (deep purple flowers) by Gavin Chambers
    While these flying insects enjoy the nectar slightly larger insects, particularly dragonflies, take advantage of the bountiful supply of food. Common hawker, southern hawker and brown hawker are seen occasionally ‘hawking’ up and down open forest tracks or around pools looking for an easy meal, rarely sitting for a rest while the sun shines.

    Brown hawker by Gavin Chambers

    Then comes the birds. There are many youngsters around at the moment all needing to find a juicy meal and insects and caterpillars are there prime target. You would think that a dragonfly would be nimble and fast enough to avoid being caught, but the hobby, a small falcon, has learnt how to do just that. On bank holiday Monday (29th) there were 2 seen over the forestry on the road to Hirnant catching insects in midair. They along with the rest of our summer migrates will be heading south to find better feeding areas in southern Europe and Africa. A marsh harrier doing just that passed over the reserve on 29th, only the 2nd reserve record. 

     Previous Blog: Rediscoveries

  • Rediscoveries

    The Lake Vyrnwy reserve is around 10,100 hectares in size which makes the finding and recording of certain species rather difficult, needle in a haystack at times. Given the size, conducting comprehensive surveys of the whole site would be extremely time consuming and therefore surveys of specific habitats or areas are more realistic. The other method for recording species is Ad-hoc, which is basically coming across species while out and about, either specifically looking for certain taxa or randomly wandering.

    Gethin trying to be artistic with my camera! (Photo by Gavin Chambers)

    Last weekend Gethin and I (Assistant Wardens) went wandering around areas on the reserve we hadn’t explored much before and where some old records of interesting plant species occurred. The first location was a steep rocky heather clad slope which we had not explored before. A lesser clubmoss, not recorded on the reserve for several years, was the highlight along with banks of bilberry ladened in large juicy berries to keep us well fed!

    Lesser clubmoss - less than 5cm tall (Photo by Gavin Chambers)

    Our next aim was to go looking for some old records within the boggier areas of the reserve, with sedges being the point of interest. However the first plant to find was somewhere along a stream on a rock, which after a short wander we found it – mountain everlasting (Antennaria dioica). Only a couple of sites in the county of this species which has male and female flowers on separate plants (dioica meaning ‘separate’).

    Mountain everlasting - no flower stalks seen (Photo by Gavin Chambers)

    It was then time to start wading into almost wellington deep bogs to look for interesting sedges. Fortunately Gethin knows what he is looking at when it comes to sedges so it wasn’t long until we (I mean Gethin) found Carex limosa (bog sedge) with its distinct drooping seed heads and soon after several clumps of Carex paniculata (greater tussock sedge). The final sedge was Carex magellanica (tall bog sedge), which to me just looked like Carex limosa but Gethin reliably informed me that it was different… I’ll let you decide!

    Carex magellanica (left) & Carex limosa (right) (Photos by Gavin Chambers)

    Previous Blog: Lake Fernwy

  • Lake Fernwy

    In our recent RSPB magazine, Natures Home, it stated that 16,000 species have been found on RSPB reserves across the UK. It then breaks it down to the top 10 reserves and also the reserve with the most species of a certain taxonomic group (birds, dragonflies etc.). Lake Vyrnwy turns out to be the RSPB reserve with the most ferns, with 22 species, which I immediately saw as a challenge!

    Given my limited knowledge of ferns I thought it would be a good summer/autumn project to learn how to identify ferns while at the same time trying to find as many of the 22 species as I could. There are only 64 species found in the UK with many of these being fairly distinct which meant I could get off to a quick start without too much head scratching.

    Probably the easiest species, which I would suspect the majority of you reading this will have already seen, is bracken. To be honest it hadn’t crossed my mind that it was a fern but having now studied all ferns it quite clearly exhibits fern characteristics.

    Wall rue (left) and maidenhair spleenwort (right) on office wall - by Gavin Chambers

    Old mortared walls are a good place to look for ferns with a few limestone species liking the lime mortar. Around the shop/office I found maidenhair spleenwort, wall rue, and hart’s tongue. The local graveyard wall has in the past been known for its ferns and from what I have found it still is, with some nice species such as: rustyback, black spleenwort and brittle bladder fern (my latest find). Another rocky species, though not requiring limestone, is the parsley fern which as its name suggests looks a little bit like parsley.

    Parsley fern likes rocky screes - by Gavin Chambers

    Identification gets a little trickier when looking at woodland species, especially the ‘shuttlecock-shaped’ species. So far I have identified male, lady, broad-buckler and lemon-scented fern along with the scaly male fern, but this is split into three species which I am yet to fully understand. Other woodland species found are beech, oak and hard fern as well as common polypody which is often found growing on tree branches and trunks.

    Lemon-scented fern which has a citrus smell when young - by Gavin Chambers

    Perhaps the trickiest species that I have found is the wilson’s filmy fern which is one of the smallest ferns and grows over damp rock, often in the splash zone of running water. Fortunately I had a rough idea where it had been found and after a couple of visits to the area found three rock faces which had it growing. It wasn’t at its best given the recent drought but it was good to see it was still present.

    Wilson's filmy fern, curled up due to dryness - by Gavin Chambers

    So I have currently found 18 of the 22 species on the reserve in around 2 months of searching. Two of the four remaining ferns are tricky to separate and will require more studying and a third species, the narrow-buckler fern, I may have found but it hasn’t completely unfurled yet so will have to go back for another look.

    Previous Blog: Mimics and Migrants