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)

Wednesday, 14 July 2010

Whitethroat parity

A quick perusal through the Heysham NR/Middleton NR ringing totals so far this year sees Lesser and Common Whitethroat both registering at 32 new-ringed birds each. I'll produce a graph of the Whitethroat ratios at Heysham over the years when I get some time, but it will almost certainly show a general trend of significant increase in the numbers of Lesser Whitethroat in relation to Common Whitethroat. In this respect, the ringing totals so far this year seem to be a reflection of local breeding birds & offspring with any 'pure' spring passage birds appearing to be non-existent (Common Whitethroat)and less than five (Lesser Whitethroat). This seems to be an especially good year for Lesser Whitethroat, notably on the Heysham NR CES where it has almost been the commonest bird!

1 comment:

Pete Marsh said...

Forgot to mention a control Lesser Whitethroat