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

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

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

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Particulate organic matter is trapped occasionally by such structures. Opportunistic taxa, such as nematodes (Aller and Aller, 1986), may become unusually abundant early in the colonization of these patches, increasing variability in faunal composition within a sampling station (Grassle and Mosse-Pocteous, 1987). Thistle and Sherman (1985) found evidence for the association of nematode species with pebbles which they assumed to provide a refuge for meiobenthos from some type of predators. At the species level, there is no evidence of an association between small-scale variations in nematode abundance and variance in the abundance of bacteria or several classes of biogenic structures.

1985). Recently there has been some evidence for benthic storms in the northeast Atlantic; currents capable of eroding and depositing sediments are associated with the sediment drifts which are extensively developed to the west of the Rockall Trough and elsewhere (Emery and Uchupi, 1984). At BIOTRANS (area 12), the deep mean flow is 3-5 cm s-l but benthic storms occur with durations between 3 and 27 days with maximum velocities of 27cm s-l (Klein and Mittelstaedt, 1992). Maximum current velocities here may approach 40 cm s-l (Dickson and Kidd, 1987) and must have an impact on the benthic fauna similar to that described by Thistle et al.

N C S N E Figure 14 The mean metazoan densities (+ SE) for each urea in the northeast Atlantic. The areas are grouped into depth zones and arranged by latitude (N, North; S, South) and/or longitude (W, West; E, East). 063 lat. 527 / - 21 15 I I 20 25 I 30 I 35 I 1 I 40 45 50 55 latitude (“N) Figure 15 The relationship between mean metazoan density and mean latitude for all areas in the northeast Atlantic deeper than 1000 m,except areas 27,28 and 29 in the upwelling near Mauretania, and the northeastern areas 13, 9 and 10 off the Bay of Biscay.

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