The study area in Poole Harbour known as Wytch Lake, indicating the sampling stations visited in June and November, 2015. The Wytch Lake Bird Sensitive Area (BSA) is indicated by the hatching. The southern hatching represents the area closed to dredging (control) and the northern hatching represents the area open July 1–October 31st (newly opened, short-term dredging). The most northerly sampling grid outside of the hatching has historically been heavily fished. The southern tip of Round Island is indicated immediately north of the study site. Shellfish dredging is permitted outside of the BSA from 25th May–24th December. The location within Poole Harbour, the UK south coast and the UK is also indicated.