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Table 5.3. Flight height summary of red-throated divers recorded in flight from monthly aerial surveys across the East Anglia THREE Site and 4km buffer.
Total Red- throated diver
27 48.
Sitting birds
26
Total flying
1
Below PCH
1
Flying birds At PCH
(22-176 m) 0
Above PCH (176 m+)
0
% Flying at PCH
0
The spatial distribution of red-throated divers from across all months (noting that all observations occurred between November and May) were recorded in the west and north west of the East Anglia THREE site and 4km buffer. Due to the small number of individuals recorded the spatial distribution map in Appendix H presents all records in one.
5.3.4 Black-throated Diver 49. A single black-throated diver was recorded during the March 2012 survey within the East Anglia THREE site. This bird was recorded sitting on the water.
5.3.5 Great Northern Diver
5.3.5.1 Abundance estimates 50.
The monthly abundance estimates provided below have been produced for the East Anglia THREE site (Table 5.4). Monthly abundance estimates for the East Anglia THREE site with a 4km buffer are presented in Appendix C.
Table 5.4. Great northern diver monthly mean abundance estimates (includes positively identified and proportioned out individuals) and monthly mean densities from aerial survey data within the East Anglia THREE Site only.
Survey Month
March April
Year Abundance estimate
2012 2013 2012 2013
174 0
13 0
Monthly mean estimate
87 7
Density (birds per sq km)
0.47 0.00 0.04 0.00
Monthly mean density
0.23 0.02
5.3.5.2 Behaviour and distribution All of the seven great northern divers recorded in the East Anglia THREE site and 4km buffer were recorded sitting on the water (Table 5.4).