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

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

ISBN-10: 0120261308

ISBN-13: 9780120261307

Advances in Marine Biology includes updated 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 beneficial properties * updated studies on marine biology * specific concentrate on plankton, fisheries, and crustacea

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1994). Hence, all but the most recent turbidites are blanketed by pelagic sediments. Bottom current deposits (contourites) are well developed on the abyssal aprons, for example around the Rockall Plateau (Hill, 1987). , 1992), areas 7-10 (Dinet and Vivier, 1977) and area 13 (Thiel, 1972a). Some areas less than lo00 m deep have coarser sediments, while most of the other areas are characterized by fine silty clays. 2. Oxygen Unlike those in shallow water, deep-sea sediments are usually well oxygenated.

Considering smaller geographic regions, nematode densities also decrease with water depth in the Porcupine Seabight, near the coast of Mauretania and to a lesser extent in the Bay of Biscay. In the latter case, densities are low (< 1000 ind/lO cm’) at the shelf break and on the upper slope (Figure 8). Copepods represent the second major metazoan meiobenthic taxon after the nematodes. Their densities vary from 166 individualsA0cm2, the highest abundance recorded by Vanreusel and Vincx (unpublished) in the Bay of Biscay, to zero as observed in a few cases by Dinet (unpublished) in some samples from the EUMELI site (areas 28, 29, 30).

D. , not defined. ). ). ). + Vanreusel and Vincx 48 M. VlNCX ET AL. dealt with only taxonomic levels higher than species (Thiel, 1983, and references therein). Species level ecological data are only available for the nematodes, copepods and foraminiferans from a limited number of areas. 1. Nematodes In the deep northeast Atlantic, only two studies (areas 6-10), from the Bay of Biscay, have dealt with the taxonomic composition of nematode communities. , 1992), and the other of several abyssal stations (Dinet and Vivier, 1979).

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Advances in Marine Biology, Vol. 30 by J.H.S. Blaxter, A.J. Southward (Eds.)

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