22/08/17 Ruddy Darter dragonfly - a new record for the reserve! Easily confused with Common Darter, but note it is slightly waisted, has a somewhat deeper red colour and black legs.
Report & photograph by Stephen Lewis
The flight season of the Silver-studded Blue butterfly has come and gone for another year. This was another good year, with numbers on the single species transect up again, for the third year in a row. The reserve saw plenty of visitors, many armed with cameras. The guided walk took place in good weather on the afternoon of Sunday 2nd July, with a turnout of about 30 people, some of whom can be seen in the photograph taken at the reserve entrance.
|Silver-studded Blue male (Roger Littleover)||Open Day|
Perhaps even more notable than the Silver-studded Blues this year were the huge numbers of Purple Hairstreak butterflies to be seen. Normally this species is seen on its larval host plant, oak trees, or adjacent trees, feeding on the honeydew left by the aphids. However this year many came down off the trees onto brambles and rosebay willowherbs at ground level. We think this may have been due to heavy rain washing off the honeydew. On one single willowherb stalk six Purple Hairstreaks were seen. They normally rest with their wings folded, but if you are very patient, and maybe a bit lucky, you will see their wings open revealing a purple suffusion if the light catches the wings at a certain angle.
3 Purple Hairstreaks on Rosebay Willowherb (Lucy Lewis)
This year we have been trying to record all the different species of damselflies and dragonflies on the pond. So far we are up to twelve species, but hope to be able to add to the list before the season ends. Sadly the fish that we believe someone has introduced into the pond are still present, and these will eat many of the early stages of the insects and amphibians that the pond was designed to support when we constructed it in 2010. Please do not introduce anything into the pond.
Common Blue Damselflies mating
The vegetation on the reserve has been surveyed this year by undergraduate students from Harper Adams University and by an MSc student from Manchester Metropolitan University. We expect that the outcomes of these surveys will be very useful in planning the future management of the reserve.
Shropshire Wildlife Trust acquired a 7 acre area on the eastern half of Prees Heath Common recently, currently known as Lot 15, and when our volunteers visited it in July we found four Silver-studded Blue butterflies, all in one small patch close to ants’ nests. A notable record.
Prees Heath Volunteer Warden
The reserve bursts into life at this time of year, with the migrant birds returning and filling the air with their songs and the wildflowers starting to show their colours. One plant has its only confirmed site in the county at Prees Heath, Heath Dog-violet, Viola canina. This plant has paler blue flowers than the Common Dog-violet and its leaves are more pointed. The good news is that it is spreading on the reserve and can now be seen in a number of places. Another unusual plant which has been seen in good numbers this spring in the grassland is Moonwort, Botrychium lunaria,which is actually a fern. It grows to about three inches tall and the leaves are shaped like half-moons - it was once believed to be a cure for snake bite.
Moomwort (Stephen Lewis}
Chiffchaffs are the first migrant birds to arrive, followed by Willow Warblers. Their distinctive songs can be heard throughout the summer, the first a two-toned rocking rhythm and the latter a descending scale weakly petering out. Common Whitethroats have also arrived. Wheatears have also been seen on the reserve as they make their way further north. Other resident species are making their voices heard on the reserve, such as Skylarks and Yellowhammers. Eight Stonechats were seen on the Hangars field in May, and it was hoped that they might breed, but they seem to have dispersed. To protect all ground-nesting birds it is important that all dogs are kept on short leads as directed by the signs on the reserve.
|Wheatear (Stephen Lewis)||Yellowhammer (Stephen Lewis)|
Each year the beginning of April marks the start of the butterfly transect on the reserve. Every week until the end of September I or another volunteer walk a set route recording all the butterfly species two and a half metres either side and five metres in front. The counts are sent online to Butterfly Conservation headquarters in Dorset and form part of a huge dataset that informs everyone – ecologists, the UK Government, the public – how our British butterflies are faring. On the reserve numbers were low during a relatively cold and cloudy April and early May, but have picked up in the recent warmer weather. A few Silver-studded Blue caterpillars have been seen, attended by ants, although not on the transect. Brimstone eggs and a Brimstone caterpillar have also been spotted on Alder Buckthorn.
Brimstone Egg (Janet Vernon)
Butterflies may be the most visible insects on the reserve but they are by no means the only ones. Lowland heath is particularly good for a huge range of invertebrates - many hundreds of insects and spiders. Two that have been seen recently are the Blue Shield Bug and the Tiger Cranefly, neither of them particularly rare but no less remarkable for that.
Blue Shield Bug (Lucy Lewis)
Tiger Cranefly (Gavin Woodman)
Contractors have been on site controlling the ragwort and docks with herbicide in the large area to the east of the runway, and will also be working there during the summer to control birch saplings. This is very necessary work as part of the ongoing restoration of the site.
Stephen Lewis, Volunteer Warden
Spring has arrived, and Small Tortoiseshell, Comma, Peacock and Brimstone butterflies have all been seen on the reserve in March, as well as an Orange Underwing moth. Work to improve the heathland habitat has continued. Students from Reaseheath College have helped to clear some brambles from near the entrance to the reserve after enjoying a guided walk around the site. Our own group of volunteers have also been busy clearing brambles and birch seedlings from the restoration areas.
|Orange Underwing Moth||Reaseheath Ciollege Students|
Mowing has continued on the Hangars field, concentrating on the heather that has been blighted by the Heather Beetle and some very tall heather. This has been done in patches, and should create suitable habitat not just for the Silver-studded Blue butterfly but also for Skylarks. The volunteers raked off and burned some of the heather cuttings, which unfortunately were found to contain many Heather Beetles, which indicate that further damage to the heather can be expected this year.
The volunteers have also been forking out ragwort rosettes on the Hangars field. Whilst doing this a Jack Snipe was flushed – at first I thought this was a Common Snipe, but I was later corrected by Allan Dawes, a very knowledgable local bird expert. I believe that this is a first time this species has been seen on the reserve since purchase, and also a first for me. It is a migratory species, only to be seen in this country in the winter, and is somewhat smaller than the Common Snipe. Several Chiffchaffs arrived in March, and a Stonechat has been seen perched on the heather.
Volunteers raking mown heather
An article appeared in the Whitchurch Herald asking people who visit the reserve regularly to help clear litter, especially from the track and
around the gates. Of course it is the responsibility of everyone to deal with their own litter responsibly, but I hope that the article results in less litter being left lying around. Pink washable paint spray continues to be used to highlight the fact that not all dog users all clearing up after their dogs. Dog mess is a health hazard and damages the soils, so any dog mess must be cleared up by the owners of the dogs.
Some plywood sheeting has been installed inside the former RAF control tower to make two rooms more secure for the bats that have been seen there, on the advice of the Shropshire Bat Group. This will mean that any bats should not be subject to disturbance during the control tower open day on Sunday 2nd July, 10.00am to 4.00pm.
Students from Harper Adams University have completed their botanical survey of the restoration areas by carrying out a series of quadrats – 2 metre by 2 metre squares, recording all the vegetation. It is hoped that these squares will be re-surveyed in future years so that we gain an understanding of the changes that are taking place, as well as giving the students some important training in survey techniques. Many thanks to Andy Cherrill and Simon Irvin of Harper Adams University for arranging this.
A local resident who knows the reserve well thinks she saw a Water Vole by the pond last year. We have not been able to confirm this, but it is well worth keeping an eye out for these likable creatures and their footprints and nibbled pieces of vegetation – go to www.whitchurchwatervoles.co.uk for more information about how you can spot the signs. The Kingfisher has been seen again, and there has been masses of frogspawn in the pond, which has already hatched, and a Little Egret has been seen locally – has he visited the pond?
Frogspawn in the pond
Prees Heath Warden, Butterfly Conservation
2016 was the 10th anniversary of the Reserve, and generally it was a very successful year. Numbers of Silver-studded Blue butterflies were their highest for three years, several events were held engaging many members of the public and we saw educational events with a local school, a college and a university. The summer was pretty good and, during the Silver-studded Blue season, we met visitors from as far afield as Kilkenny in the Irish Republic, Inverness in Scotland and Kent.
December witnessed more mowing on the Hangars field of the heather that had been damaged by the Heather Beetle. This time Lucy Morton, Butterfly Conservation Reserves Officer, did the mowing, and more is planned for February. We hope that the beetle will not be so prevalent this year, and we expect that the damage it inflicts will tend to be cyclical, meaning that we can expect an outbreak once every few years. During the mowing I was able to photograph a rather attractive small heathland moth that flies in the winter, Acleris hyemana.
|Mowing||Small Heathland Moth|
Before Christmas the Butterfly Conservation volunteers litter-picked the site, an annual event, resulting in a large quantity of litter being taken to Whitchurch Recycling Centre. Afterwards they enjoyed a lunch at the Midway Café courtesy of Butterfly Conservation as a mark of gratitude for all the work they have done over the year. This year they have already done some bramble clearance work on the north end of the reserve.
Litter on the reserve is becoming more of a problem as visitor numbers increase. It needs to be picked up more often. I am asking anyone who visits the reserve on a regular basis to help by collecting litter, especially around the entrance gates and the track. I have a number of litter pickers and bags I can give to people who are willing to assist – just give me a call or send me an email, details are at the bottom of the report.
A few weeks ago I was contacted by Harper Adams University suggesting a student project on the reserve. Since then a group of undergraduate students have been busy designing a vegetation survey of the restoration areas, and they are now carrying this out – maybe this time of year is not the best time to be doing botanical work, but it has to fit in with their course timetable. It is planned that the survey will be repeated every two or three years so that we can have some useful data as to how these areas are changing over time, as well as the students benefitting from increasing their survey skills and botanical knowledge. Many thanks to Andy Cherrill and Simon Irvin of Harper Adams for their work on this, and of course to the students themselves.
Prees Heath Volunteer Warden