Reed Warbler RAS Results

Just about the end of the Reed warbler season and a chance to compare this season's results with previous years. This is the 20th year of our study at Leighton Moss RSPB Reserve where we run a Reed Warbler RAS as a side line to our main study of the Bearded Tit populations.

Due mainly to poor ringing weather especially early in the season our visits at 33 have been lower than usual,this compares with 46 in 2015.

We caught 104 adults(61 new and 43 retraps). This compares with 140 (84 new and 56 retraps) adults last year, but allowing for the drop in effort early in the season it does suggest a possible small drop in the breeding population. Productivity though has been better with 350 juveniles ringed compared to 267 last year and possibly a few yet to come if we get out in the next few days.

Of the retrap adults the oldest was 8 years, one at 5 years and 5 at four years. A highlight was the catching of a Spanish ringed bird ringed on autumn passage in North Spain, only our fifth from that country although we have had 29 from France, 8 from Portugal and 4 from Morocco.One of our juveniles ringed on July 6th was caught 31 days later at Icklesham East Sussex.