Two of my extra duties during the reed cut on Sunday, initially car park attendant and later a dash to a filling station for fuel for the cutting machines, enabled me to keep an eye on the Chiffchaffs around the sewage works. Numbers gradually rose as the morning progressed and peaked around midday and there were plenty around when the sun was at its highest. The current area of high pressure has led to sharp frosts, but the associated dry weather and light NE breeze are the perfect conditions for trapping beside the sewage works as both insects and birds drift towards the net rides.
Consequently, together with my wife Nikki, we deliberately arrived a little later than usual and set up the maximum number of nets possible downwind of the works. Numbers did not disappoint, and 53 birds were trapped in around four hours. Just over half of these were re-traps, which is normal here for this stage of the winter, but the total included 23 Chiffchaffs, 7 Firecrests and 4 Goldcrests. In fact, except for one female Bullfinch, all of the birds caught were insectivores highlighting the importance of the midge population breeding in the sewage works.
My long-suffering wife has always been supportive of my ringing and frequently accompanied me during my training, visiting Icklesham and even sleeping in a bird hide in Portugal for two weeks but she’s definitely not a fan of the early mornings! Today’s later start persuaded her to accompany me. I had forgotten how much easier it is to erect the nets with two people and how having someone else to scribe speeds up the ringing process so, although tiring, the day was much more relaxed than it might otherwise have been!
The first stable area of high pressure since last September produced a beautiful sunny day for the first reed cut of the winter. Although cold, the physical efforts of the 20 or so volunteers and the subsequent burning of the cut reeds kept everyone warm. Unfortunately, the Devon Birds’ reed cutting machine suffered a major breakdown for the third successive year, which reduced the area cut. However, thanks to the personal efforts of Rory Sanders, who had purchased a second machine for parts we were able to continue and cut and burn around 5,500m2.
None of this would have been possible without the sterling efforts of Nick Townsend, who had dug down through the compacted sandbar at South Milton Sands, allowing the water impounded within the Ley to drain in time for the cut.
More of my and James Day’s photos can be seen in the following gallery.
The first calm and sunny day of 2020 drew me to SML like a moth to a flame. After two weeks of dull, wet and windy weather confining me to home, I was starting to get cabin fever and, although bright conditions make the nets more visible and can reduce catches, knowing that the forecast for the next week is grim saw me slopping through the mud at 8am. In the not too distant past decent numbers of Reed Buntings roosted in the reedbed in winter and up to nine birds could be found together in the same net. However, these have declined significantly in recent years and, apart from the odd Cetti’s Warbler, the reedbed nets are not very productive in mid-winter. Consequently, I decided to try Crest ride at the wooded, eastern end of the reserve as an alternative, which provided a quarter of the birds trapped.
Catches in previous Januarys have ranged between 12 and 73 birds, depending partially on weather conditions and the number of visits, but principally on the presence or absence of chironomid midge swarms. Midges were few and far between today and the number of birds trapped reflected this with a final total of 28 of which just 14 were new. Five of the re-traps were Firecrests, a bird which manages to brighten even the dullest of days. Birds processed: 3 Blue Tit, 1 Bullfinch, 8 Chiffchaff, 1 Dunnock, 5 Firecrest, 4 Goldcrest, 2 Great Tit, 1 Robin, 1 Song Thrush and 2 Wren.
Given the continuing overcast weather, combined with other commitments over the festive period, I decided to make a start on revising some of the other pages on this blog. I’ve been working on a paper detailing the population dynamics of Chiffchaffs wintering at South Milton Ley. British Birds sent the first draft out to five reviewers and it returned with a lot of comments. Fortunately, these were almost entirely constructive and I have recently resubmitted a significantly revised second draft. When (or if) this is eventually published, I intent to expand the section on wintering Chiffchaffs in the blog considerably. However, in the meantime I have updated and sorted all the photos of Siberian Chiffchaffs ringed at SML since December 2014 into a thumbnail gallery, which can be accessed here:
Firstly, a happy and productive New Year to my handful of regular readers. My last day’s ringing at SML for 2019 turned out to be the least productive session ever with just one new bird and six re-traps caught in four hours with 90 metres of net erected. A minor consolation came in the form of a UK control Chiffchaff but everything was hard work. The weather was particularly gloomy with enough moisture in the air to condense on the nets requiring more frequent rounds than usual. The wind, although light, was from the southwest, the least favourable direction for trapping around the sewage works in winter and the ground was saturated making progress between and along the net rides slow and hazardous. Even my lightweight Daihatsu 4×4 with the diff-lock on struggled to find enough grip to get me and the ringing gear on-site.
I tend not to visit on days like this as experience has shown that most Chiffs are present when it’s calm and sunny, which encourages chironomid midges to swarm around the sewage works. It does make me wonder where the birds go when the weather is less favourable. Perhaps they feed in woodland and large private gardens further up the valley on days like this. Ringing in previous winters has shown the minimum population at SML to be around 90 birds with estimates, made using capture/recapture models, suggesting that the true figure could lie between 188 and 227. That’s a lot of disappearing birds!
Crops of photos taken recently at South Milton Ley by Richie Moore, published on the Devon Birds’ website and reproduced here, clearly show the importance of chironomid swarms to wintering insectivores when the sun is out. Reassuringly, all the birds have rings on!