10.5.2.2 Infaunal communities in the East Anglia THREE site 80.
The infaunal communities within the East Anglia THREE site are dominated by many of the same species groups as the East Anglia Zone. Polychaetes are the most numerous class in terms of individuals followed by malocastraca. The East Anglia THREE site however, is less diverse than the Zone containing a fewer number of species (146 compared with 512).
2% 4% 4% 7% 8% 14% 59% 2%
Polychaeta Malacostraca Ophiuroidea Echinoidea Bivalvia Gastropoda Nemertea Other
Diagram 10.3 Infaunal breakdown for the East Anglia THREE site (including data from the Zone surveys and EA THREE / FOUR surveys): Number of individuals by class. Where species identification to class is not possible, species are displayed by phylum (for example Nemertea).
81.
The species composition of the East Anglia THREE site differ slightly from that of the East Anglia Zone. S. spinulosa is far less abundant with only 15 individuals found across nine stations. Other polychaetes such as Spiophanes bombyx (935 individuals found across 37 stations) and Nephtys cirrosa (81 individuals at 30 stations) are more numerous. Also of note was a high abundance of Capitella sp. at station 163 in the north of site. This species is known for its aggregating behaviour which is sometime associated with areas of pollution.
82.
The malacostracan Urothoe brevicornis was the most abundant crustacean across the East Anglia THREE site with 98 individuals found across 18 sample stations. This species was also important in the context of the East Anglia Zone being found at more stations than any other species in its class as well as being the third most abundant in terms of individuals identified. Bathyporeia elegans (53 individuals
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 1 Introduction Page 40
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