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5.3.18.2 Bio-season mean peak estimates 102. Great black-backed 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.
103. Numbers peaked during the winter bio-season when an estimated 634 individuals were present within the East Anglia THREE site, with an estimated 2.08 birds / km2 (Table 3.34). Monthly densities of great black-backed gulls within the East Anglia THREE site and East Anglia THREE site with a 4km buffer are presented in Appendix C.Mean peak abundance estimates for all bio-seasons indicate that great black- backed gulls are below regional thresholds in the East Anglia THREE site only (Table 5.35).
Table 5.34. Bio-seasonmean peak abundance estimates and mean peak densities of great black- backed gulls within the East Anglia THREE Site only.