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5.3.17.2 Bio-season mean peak estimates 96. Herring gull is a species for which an overlapping occurrence of passage birds and more local breeding birds had been noted from an examination of the monthly occurrence of the data. The biological mean peak abundance estimates contain an apportionment to account for this overlap, though monthly mean peak estimates for this species before this apportioning across bio-seasons is contained in Appendix B.
97. Numbers peaked during the winter bio-season when an estimated 572 individuals were present within the East Anglia THREE site, with an estimated density of 1.88 birds / km2 (Table 5.30).Monthly densities of herring gulls within the East Anglia THREE site and East Anglia THREE site with a 4 km buffer are presented in Appendix C. Mean peak abundance estimates for all bio-seasons indicate that herring gulls are below regional thresholds in the East Anglia THREE site only (Table 5.31).