Depth-related patterns of macrobenthic community structure and composition have been studied from box-core samples from the Scottish continental slope where deep-sea trawling and oil exploration are becoming increasingly important. There is a strong pattern of declining biomass and faunal abundance...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.627.2666 2023-05-15T17:45:40+02:00 The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.627.2666 http://www.db.uac.pt/pdf/island/32_margin.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.627.2666 http://www.db.uac.pt/pdf/island/32_margin.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.db.uac.pt/pdf/island/32_margin.pdf Key words macrobenthos deep sea bathyal community structure downslope pattern text ftciteseerx 2016-01-08T15:16:49Z Depth-related patterns of macrobenthic community structure and composition have been studied from box-core samples from the Scottish continental slope where deep-sea trawling and oil exploration are becoming increasingly important. There is a strong pattern of declining biomass and faunal abundance with increasing depth, but results also indicate reduced biomass and numbers of macrobenthos in the shallowest samples from just below the shelf edge where there are coarse sediments and a regime of strong bottom currents. There is also reduced species diversity at the shallowest stations, probably caused by hydrodynamic disturbance, but no clear mid-slope peak in species diversity as described from the northwest Atlantic. Taxonomic composition of the macrobenthic community shows most change between about 1000 and 1200 m, expressed as a major dichotomy in multivariate analysis by cluster analysis and ordination. It also shows up as a step-like increase in the rate of accumulation of new macrofaunal species. This corresponds to a change in hydrodynamic regime, from a seabed rich in suspension- and interface-feeding epifauna, to one where biogenic traces from large, burrowing deposit feeders are well developed, and visible epifauna rare in seabed photographs. It also corresponds to the depth zone where earlier study of megafaunal echinoderms in trawl and epibenthic sled samples also shows a clear peak in across-slope rate of change in faunal composition. Text Northwest Atlantic Unknown |
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English |
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Key words macrobenthos deep sea bathyal community structure downslope pattern |
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Key words macrobenthos deep sea bathyal community structure downslope pattern |
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Key words macrobenthos deep sea bathyal community structure downslope pattern |
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Depth-related patterns of macrobenthic community structure and composition have been studied from box-core samples from the Scottish continental slope where deep-sea trawling and oil exploration are becoming increasingly important. There is a strong pattern of declining biomass and faunal abundance with increasing depth, but results also indicate reduced biomass and numbers of macrobenthos in the shallowest samples from just below the shelf edge where there are coarse sediments and a regime of strong bottom currents. There is also reduced species diversity at the shallowest stations, probably caused by hydrodynamic disturbance, but no clear mid-slope peak in species diversity as described from the northwest Atlantic. Taxonomic composition of the macrobenthic community shows most change between about 1000 and 1200 m, expressed as a major dichotomy in multivariate analysis by cluster analysis and ordination. It also shows up as a step-like increase in the rate of accumulation of new macrofaunal species. This corresponds to a change in hydrodynamic regime, from a seabed rich in suspension- and interface-feeding epifauna, to one where biogenic traces from large, burrowing deposit feeders are well developed, and visible epifauna rare in seabed photographs. It also corresponds to the depth zone where earlier study of megafaunal echinoderms in trawl and epibenthic sled samples also shows a clear peak in across-slope rate of change in faunal composition. |
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The Pennsylvania State University CiteSeerX Archives |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.627.2666 http://www.db.uac.pt/pdf/island/32_margin.pdf |
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Northwest Atlantic |
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Northwest Atlantic |
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http://www.db.uac.pt/pdf/island/32_margin.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.627.2666 http://www.db.uac.pt/pdf/island/32_margin.pdf |
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