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Read e-book online Advances in Marine Biology, Vol. 30 PDF

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By J.H.S. Blaxter, A.J. Southward (Eds.)

Advances in Marine Biology comprises up to date reports of all parts of marine technological know-how, together with fisheries technology and macro/micro fauna. each one quantity includes peer-reviewed papers detailing the ecology of marine areas. Key gains * up to date studies on marine biology * specific specialize in plankton, fisheries, and crustacea

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2 1 11 1 0 13 4 2 3 ? 8923 n >, v 10 12 30 @289 v) n I -1 -2 -3 -3 -2 -1 0 1 2 MDS (x) Figure 22 Ordination (MDS) of areas based on percentage composition of nematodes, copepods, polychaetes and combined other taxa, using arcsine transformation. 4. , 1991a, b; Pfannkuche, 1993a), from the Norwegian Sea (Dinet, 1979), from the Greenland, Norwegian Sea and Indian Ocean (Thiel, 1975; Jensen, 1988), the Arctic Ocean (Pfannkuche and Thiel, 1987), and the southeast Atlantic (Soltwedel, 1993). 5 2 MDS (x) Figure 23 Ordination, as Figure 22, but excluding area 5 from the analysis.

Nevertheless, the evaluation of all meiobenthic data available from the northeast Atlantic shows changes in taxonomic composition with increasing water depth. Box plots illustrate the trends for different taxa (Figure 13 a-d). In these figures all 17 areas from which composition data are available are arranged in 11 depth classes. The relative abundance of nematodes generally increases with depth, and correspondingly the percentage composition of all other taxa decreases with depth. 05) between mean 32 M.

In the southern part of the northeast Atlantic, off the coast of Mauretania, densities were relatively high at the deepest sites (areas 27, 28 and 29: means 500-1000 ind10cm2), higher than on the upper slope and in the shelf break area (area 26: 500 i n d l 0 cm2) (Thiel, 1975; Dinet, unpublished). The lack of any depth-associated gradient in this area, and the relatively high densities on the lower part of the slope, are due to increased primary production resulting from intense upwelling activity in the water column, and providing high food input to these deeper areas.

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