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)

Monday, 25 August 2014

Warbler Miscellany

With decent weather we caught 333 birds in three visits to our reed  bed sites at Leighton Moss RSPB Reserve. Bearded Tits our main study species started to feature again as the first brood complete their moult. Bearded Tits are one of those species where the juveniles moult their flight feathers and they become almost flightless during the moult but all 5 that we caught had all but completed their moult.  Two had been ringed as first brood nestlings  giving us precise data as to their age in relation to completion of the moult.

Warblers  though proved the most interesting. Our catches of Sedge Warbler have been low this year, on Saturday it looked as though they were picking up with a catch of 25 compared to 39 Reed Warblers, but Sundays catch produced only 2 compared with 35 Reed Warblers. One feature of Saturdays catch was the low weights with many under 10 grams suggesting they had migrated over night, probably from  Scotland.

Reed Warblers appear to be having a bumper season, we are just short  of the 1000 mark for the year. Despite ringing 450 juvs in July all but one of the 28 retraps we had this weekend were from August ringing, the exception was a bird ringed as a short  tailed IJ  on 21/7. this strongly suggests that all the first brood Reed Warblers along with most of the  adults have moved out. We have caught only  14 adults in August.

But the star of the show was Willow Warbler. If our catches are any thing to go by they also have had a bumper season. In the whole of the 2013 season we caught only 183 but to date this year we have already caught 307. Many of this weekends catch were  long winged birds suggesting a northern origin


1 comment:

Pete Marsh said...

The small Reed Warbler population at Middleton Nature Reserve disappeared about two weeks ago with just one migrant ringed since then. Can I add Whitethroat to the bumper year for warblers with about 200 ringed at Middleton/Heysham, almost 50 more than the previous highest catch in 35 years of coverage.... and another week or so to go for this species, mist netting weather permitting