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Sublittoral hard substrate communities off Helgoland
Helgoländer Meeresuntersuchungen volume 45, pages 317–344 (1991)
Abstract
In the Helgoland region eight sublittoral hard substrate communities occur. These communities were stationary in time during the years 1987–1989. The major governing parameters are the available amount of daylight and the degree of exposure to water movement. In the photic zone, three communities are met with, one of which is widespread and appears to be independent of the exposure to water movement. Under exposed conditions, at the lower border of the photic zone, a second community is observed. A third community is established on erosive muschelkalk substrates. In the aphotic zone also, three communities are found. The distribution of these communities is related to the rate of water movement. One community is divided into three variants, with different preferences regarding the angle of inclination and nature of the substrates. In the artificially constructed harbours, where sedimentation exceeds erosion, two different communities have settled. In the community under moderately sheltered conditions many species are found which also occur in the natural photic zone. Under extremely sheltered conditions a group of species has become dominant which is very rare in the Helgoland region outside the quay-walls but which has been described as being characteristic for sheltered localities elsewhere.
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de Kluijver, M.J. Sublittoral hard substrate communities off Helgoland. Helgolander Meeresunters 45, 317–344 (1991). https://doi.org/10.1007/BF02365523
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DOI: https://doi.org/10.1007/BF02365523