NLRG was formed in 1957 to help in the study of birds in the Lancaster and District Birdwatching Society area. There are currently 12 active ringers. Species currently being studied include: Pied Flycatcher, Bearded Tit, Sand Martin, Twite, Goosander, Oystercatcher and Grey Wagtail. Migration has been studied for 28 years at Heysham. We welcome anyone who wants to observe, help or perhaps wish to become a ringer. Photo: A Heysham-ringed Twite on the Mull of Kintyre (thanks to Eddie Maguire)

Sunday, 20 July 2014

Reed Warblers Prepare to Leave

Highlight of a catch of 64 Reed Warblers today was Y332103. Originally ringed as a juvenile on 25/08/2011. It was caught on  18th of June this year when it weighed 11.8 grams. Today it weighed 14.5 grams and had a fat score of 5 and was obviously preparing to  leave. The average weight of 5 other adults caught today was 11.1 grams.

Numbers of adults caught start to drop in late July and early August and most have left before the end of August.  We have 6 controls of adult Reed warblers on the south coast in the second half of July, 11 in August and 3 in the first few days of September. By contrast juveniles don't occur there until the middle of August and reach a peak in the last days of August and early September and continue into September. Almost  all the juvs caught today were in post juvenile body moult and had normal weights.

The other amazing thing about todays catch was the complete  absence of Sedge warblers on the same date last year at this site we  caught 8.
John







 

Friday, 18 July 2014

Where are the Sedge Warblers?

To date we have only caught 21 Sedge warblers in our study of reed bed birds  at Leighton Moss RSPB. This compares to 61 up to the same time last year. The good weather has allowed us to make more visits and this reflects in the catch of Reed Warblers on our RAS study- 329 compared with 182 in the same period last year. So in theory the Sedge  Warbler catch should be higher

Judging from recoveries, most of our catch of Sedge Warblers are migrants as opposed to Reed Warblers which are mainly birds bred on the reserve so it will be interesting to see how the season unfolds. Lets hope the weather continues  good.

We have now equaled the total 2013 catch of 48 young Bearded Tits with some of the best time for catches to come. All the recent catches have been of later broods and the first brood young have started to moult making them difficult to catch. Bearded Tits are one of those species which renews their flight feathers in their first  year.

John

Saturday, 12 July 2014

Reed Warblers Bounce Back

After a period of very low catches (see my last post) with catches as low as 2 per session. Reed Warblers have come good over our last three RAS catches. This culminated in todays catch of 47 which consisted of 11 adults and 36 Juveniles.

We have now caught  96 different adults as part of the RAS study. This compares with 146 in the whole season in 2013 and an average of 190 over the 17 years of our study at Leighton Moss RSPB Reserve.
Our total catch so far this year is 249 compared to 1021 in 2013 but there is  well over 2 month to go.

Sedge Warblers though have so far been low with only 19 caught to date. Most of the birds we catch are passage birds so may be they are  rather late this year. Bearded Tits though  are doing well with 45 juveniles caught compared with just 48 in the whole of 2013.
John

Friday, 4 July 2014

Bearded Tits Prosper while Reed Warblers Falter

Bearded Tits appear to have had an excellent season at Leighton Moss RSPB Reserve. To date we have caught 42 juveniles which compares with just 48 in the whole of 2013. Young Bearded Tits can be aged by their iris colour which changes from dark brown to  yellow  with age. Using this data almost all the ones caught to date are from the first  broods but in our  last catch on July 1st out of the 9 caught 4 had dark brown eyes and were obviously second broods.The first photo shows an older male with a yellow eye, while the second is of a very young female  with dark brown eye.

Our Reed Warbler RAS got off to a good start and to date we have caught 76 adults (44 new birds and 32 retraps. The retraps included a six year old and a five year old.
Young birds started to appear quite early on 21st June but since then catches of both adults and juveniles have declined especially at two of our sites which are normally good for this species. One possible explanation is that the reed bed is in better condition this year  because of only little damage over the winter by roosting Starlings. For the previous five or so years large areas of the reed bed have been devastated by the Starlings rendering them unattractive  to  breeding Reed Warblers and concentrating the early breeders at least in the remaing good areas close to our ringing sites. This year they can spread right thoughout the reed bed.  However only our visits over the next three months will tell. Would be interesting to know how other Reed Warbler ringers are finding the season.
John

Wednesday, 2 July 2014

A Colour Ringed Greenshank

A colour ringed Greenshank has  frequented the Eric Morecambe Pool  at RSPB Leighton Moss since June 26th. It was ringed by the Highland RG on the breeding grounds in Sutherland on June 4th.  Ron Summers reports that it was an unsuccessful breeder which probably accounts for it quick move away from the breeding area. It will be interesting to see how long it stays and if it remains on the pools to moult. It was also fitted with a geolocater  which if it can be trapped again next year should tell the full story of its migration  and wintering area.
Thanks to Janet Dewhirst for the photo.

This is the second colour ringed Greenshank to visit the Eric Morecambe Pool. The previous one was  ringed as a juvenile in Aberdeenshire in September 2007 . It spent the following winter in  Donegal Ireland. But it appeared on the Eric Morecambe Pool  on 21st June 2008 and moulted there until late August. In 2009 it returned on 28th June and again moulted there being last recorded on 20th of August. It will be interesting to see if the present one follows a similar route.

John

Saturday, 28 June 2014

Nest Boxes have a Successful Year

It's  been a successful and early  season for all the seven nest box schemes that I collect data for. Of the 213 nest boxes 124 (58%) were occupied by 54 Blue Tits, 46 Great Tits, 17 Pied Flycatchers 3  Nuthatch,  and 2 each of Marsh Tits and Coal Tits. Compared with 2013 Blue Tits are up by 8, Great Tits down by 8 and Pied Flycatchers up by one. Distribution though was interesting. Comparing the numbers of Great Tits to Blue Tits, in the mainly Ash dominated woodlands in the low lying Silverdale area 60% were Great Tits but in the higher Oak Woodlands of the Lune valley 84% were occupied by Blue Tits. The figure in the Lower Oak woods was 66% for Blue Tits


Pied Flycatchers appear to be moving away from the lower oak woodlands. This year they have declined from four pairs to just two. But  the upper woodlands have seen an increase of three pairs.

Success rate for all species was very high with 95 boxes (79%)producing young. Apart from losses of complete broods in one area which was almost certainly due to predation of the adults by Sparrowhawks. Survival after hatching has been high being 92% in Blue Tits and 98% in Great Tits. These high survival rates are no doubt due to the  large numbers of moth caterpillars reported this year and the favorable weather.

John

Sunday, 15 June 2014

A Promising Start to Our Bearded Tit RAS

Our first three catches of the season at Leighton Moss RSPB resulted in the capture of 24 juvenile Bearded Tits. This compares with just 48 in the whole of the 2013 season and suggests excellent productivity. Young Bearded Tits can be aged by the colour of their iris  and almost all the ones we caught were from the first brood which fledged in late April/early May. Six of the 24 had been ringed as first brood nestlings. Shortly after fledging Bearded Tits form apparent pairs.  Almost all the birds we caught were in pairs, interestingly three of the nestlings were from the same brood but  they had  linked up with  birds from other broods. In previous years we have caught juveniles  throughout the summer and occasionally into early October, so all being well we should have many more yet to catch.

Census work on Bearded Tits is very difficult as they do not sing or behave territorially, so our RAS study gives a good guide to the size of the breeding population. From sightings of colour ringed birds and our re-trapping  we have so far identified 9  adult males and 8 females but we continue to trace more adults as the season goes on right up to grit tray sightings in October and November.

John