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

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

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

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1985). The decrease in copepod densities with water depth within smaller geographic areas is pronounced in the Bay of Biscay (Figure 10). In the Porcupine area densities are higher on the lower (area 2) than on the 27 MEIOBENTHOS OF THE DEEP NORTHEAST ATLANTIC I 2- 1 28 2 Q) 0 0 6 8 E 29 3 7 5 Q) C 'l 12 4 9 13 1030 23 n " l 0 I 1000 I I 2000 3000 4000 5000 6000 depth (m) Figure 7 The relationship between mean nematode density and mean water depth for each area (cf. Table 1) in the northeast Atlantic.

A decrease in available food (quantitative and qualitative input of detritus to the benthos) or an increase in available space (generally lower abundances in deeper regions) with water depth are examples of the third type. While availability of interstitial space probably would not affect smaller benthic size groups (such as the meiobenthos) significantly, the decisive influence of the quantitative and qualitative food supply on benthos is clear. For the smallest benthic organisms such as protozoans (mainly foraminifera) it is clear that they are well adapted, by their short generation times and opportunistic feeding habits, to respond quickly to the variable food input at abyssal depths (Linke, 1992; Pfannkuche, 1993b; Altenbach, 1993).

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 Their densities vary from 166 individualsA0cm2, the highest abundance recorded by Vanreusel and Vincx (unpublished) in the Bay of Biscay, to zero as observed in a few cases by Dinet (unpublished) in some samples from the EUMELI site (areas 28, 29, 30). While the general distribution pattern exhibits a decrease with increasing depths (Figures 9 and lo), high densities of copepods (50450 ind/l0 cm’), are recorded in the northwestern abyssal zone.

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