Yesterday we joined the annual visit by Steve and The Pembs RG to Caldey to look at Herring Gull productivity. Several of the colonies were checked, all with poor, although variable productivity.
Even at the most successful part of the colony, only 100 juveniles from c400 nests were ringed. We would expect to be able to ring the required 200 juveniles at this part of the colony.
Small numbers of gull chicks were either too small or too big to ring, but overall Steve will have some poor productivity figures to report, even though this was a late season visit.