Willow Warblers on a Roll

Our recent catches at Leighton Moss have been dominated by Willow Warblers, partly because the nets in the reed bed have been exposed to wind reducing the catch of Reed Warblers and Bearded Tits but the  nets near willows are more sheltered. However its interesting to compare this years catch with the  same period over the past three years. To date this year we have caught 225, this compares with an average catch of just 107 over the past three years. This suggests good productivity this year in common with many other species. Our local Willow Warblers  have maintained their populations. However ringing recoveries from previous years suggest that  the bulk of the passage population originates in Scotland with 15 recoveries there mainly in the breeding season. We have also ringed more Chiffchaff although their main passage period is usually a little later.
John