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10.1 MULTIVARIATE STATISTICAL ANALYSIS OF COMBINED DATA
10.6.1 Introduction 1.
This appendix contains information regarding the multivariate statistical analysis that was conducted in order to characterise the faunal groups which exist across the East Anglia Zone.
10.6.2 Data acquisition 2.
As outlined in Chapter 10 Benthic Ecology data from three separate survey campaigns commissioned by East Anglia Offshore Wind (EAOW) have been used to inform the Benthic Ecology baseline. These include: ZEA surveys, East Anglia ONE cable route surveys and East Anglia THREE and East Anglia FOUR surveys. Data has been collected using three different methodologies:
• •
• 3. Grab samples to characterise the infauna (animals living within the sediment);
Beam trawls to characterise the epifauna (animals living attached to the sea bed); and
Video footage to identify the presence and extent of biogenic reefs (Reef structures created by organisms).
Table 10.6.1 shows the number of samples that have been acquired from the three different campaigns across the East Anglia THREE site and the offshore cable corridor. Further detail regarding the different surveys is provided in Chapter 10 Benthic Ecology and the survey methodologies in Appendix 10.2 and Appendix 10.3 within Volume 3 of this Environmental Statement and in Appendix 9.2 of the East Anglia ONE Environmental statement.
Table 10.6.1. Sample stations included within the multivariate analyses Study Area
Grab samples (Infauna)
ZEA Surveys
East Anglia ONE Cable Route Survey East Anglia THREE FOUR surveys Total
566
41 None acquired 49
656
Trawl samples (Epifauna)
78
12 90
10.6.3 Analysis 4. Multivariate statistical analysis was conducted on the infaunal data (from the grab surveys) and the Epifaunal data (from the trawl surveys) separately. The analyses