Benthic Communities at Horns Rev Before, During and After Con

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Horns Rev. Benthic communities Page 58 Although no distinct distribution patterns in abundance and biomass could be shown for the any of the most abundant species, statistically significant differences in community structures between different zones on the scour protection at different distances from the monopile were found (Figure 3.18 and Table 3.15). Gradually overlapping zones with similarities in community structures were found within 2 metres of the monopile, whereas the community structure in zone closest to the monopile was statistically significant different from the community structures closer to the periphery of the scour protections. No differences in the community structure were found between the NNE and the SSW sites with respect to current regimes. In the transect surveys, no significant differences between the NNE and SSW transects were found. In general, as in the quantitative samples, statistical differences were also found between the stations close to the monopile and stations at the edge of the scour protection. Close to the edge of the scour protections, no statistical differences were shown between stations across the zones with different size of stones. Three overlapping zones on the scour protections were identified. One distinct zone covered the distance from the monopiles to 10 m from the piles, the second zone covered the distance from 6 m to 12 m and the last zone covered the distance from 10 m to 16 m from the monopile. The coverage and frequency of Jassa marmorata, Metridium senile and Cancer pagurus decreased towards the edge of the scour protection while the occurrence of the sand dwelling bristle worm (Lanice conchilega) at the outer edge of the scour protections contributed to the difference between the zones. The sea anemone (Sargartiogeton laceratus) was less frequent close to the monopiles and at the periphery of the scour protections compared to the zone 2-10 metres from the monopiles. Scour protections, spring Scour protections, autumn Jassa marmorata Stress: 0.2 Stress: 0.2 2003 2004 2005 Jassa marmorata Mytilus edulis Mytilus edulis Stress: 0.23 Stress: 0.23 2003 2004 2005 Doc. No. 2572-03-005 rev. 4
Horns Rev. Benthic communities Page 59 Asterias rubens Stress: 0.2 Stress: 0.2 Asterias rubens Stress: 0.23 Stress: 0.23 Figure 3.17.MDS plots of relative abundance on scour protections concerning differences between different sampling campaigns. Doc. No. 2572-03-005 rev. 4
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Benthic Communities at Horns Rev Before, During and After Con

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