106. The class Hydrozoa constituted over 15% of the species identified within the East Anglia Zone with Hydractinia echinata (found at 69 sample stations) and Tubularia sp. (identified at 30 sample stations) the most widely distributed.


107. In order to characterise the epibenthic communities across the two data sets, the data were combined (as described above) and cluster analysis was conducted using PRIMER V6 (see Appendix 10.6 for further detail). The result of which identified six different epifaunal groups within the East Anglia Zone. These are presented in Table 10.12 below and their locations are displayed in Figure 10.10


108. Within the East Anglia Zone the multivariate analysis showed six distinct faunal assemblages at the 48% similarity level (Appendix 10.6). A 48% similarity suggests that all of the identified communities are relatively similar and therefore the epibenthic environment across the zone is very homogenous. Details of the epibenthic faunal groups are provided in Table 10.12


Table 10.12. Epifaunal Groups identified using Cluster analysis for the East Anglia Zone and offshore cable corridor


Faunal Group


A B


Dominant species (% contribution)


Crangon allmanni (only one sample in group)


Crangon allmanni (9.71) Pomatoceros (9.44) Paguridae (27.21)


C


Crangon allmanni (14.64) Asterias rubens (13.87) Paguridae (13.00)


D


Paguridae (16.67) Crangon allmanni (13.76) Philocheras (8.59)


E


Crangon allmanni (43.01) Paguridae (15.49) Liocarcinus holsatus (12.17)


F


Ophiura ophiura (17.01) Ophiura albida (14.73) Crangon allmanni (13.41)


Common name Brown shrimp


Brown shrimp A tube worm Hermit crabs


Brown shrimp Common starfish Hermit crabs


Hermit crabs Brown shrimp A crustacean


Brown shrimp Hermit crabs Flying crab


A brittlestar


Serpent’s table Brittlestar Brown shrimp


Average similarity


(only one sample in group)


53.03


Number of stations


(only one sample in group)


3


52.82


4


59.29


30


60.99


2


60


49


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 1 Introduction Page 47


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