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 updated reports of all components of marine technology, together with fisheries technological know-how and macro/micro fauna. every one quantity comprises peer-reviewed papers detailing the ecology of marine areas. Key positive factors * updated stories on marine biology * specific specialise in plankton, fisheries, and crustacea

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Data evaluation is therefore a challenge and observations of differences in faunal densities and changes in faunal composition have to be made with some caution. 1. 1. e. under constant climatological and ecophysiological life conditions). This tendency does not hold for the total northeast Atlantic ocean, as illustrated in Figure 4, in which the mean densities per area are plotted as a function of mean water depth. In general the lowest densities are recorded at abyssal depths where mean densities for each area are never higher than 600 individuals (ind)/10cm2, and the highest densities are found in the shallowest areus (< 1000 m: mean per area up to 2000 i n d l 0 cm2), but occasionally densities of less than 500 i n d l 0 cm2 are recorded on the upper slope and in the shelf break area.

VINCX ET AL. , METAZOA densities 40" 24 ~ -1000m 3000m -5000111 Figure 5 Map of the northeast Atlantic showing the mean metazoan density for each ureu (as defined in Table 1) (indl0 cm2). MEIOBENTHOS OF THE DEEP NORTHEAST ATLANTIC 25 explained the lower densities found during the Meteor 21 cruise by the outflow of warm Mediterranean water, which accelerates along the Atlantic slope due to its higher density, preventing the sedimentation of detritus. On a transect near the Portuguese coast (Thiel, 1975), meiobenthic densities decrease from 1400 to 100 ind/lO cm2 in relation to bathymetric depth (areas 14, 15 and 16).

1988), Rutgers van der Loeff and Lavaleye (1986) and Rutgers van der Loeff (1991) (area 11; Figure 2). Oxygen invariably penetrates to a depth of at least several decimetres and usually much deeper. , 1985, 1986). This was attributed by Wilson et al. (1985) to the oxidation of organic matter in a turbidite layer. A relatively shallow depth (25-30cm) of oxygen penetration was also observed by Rutgers van der Loeff (1991) (area 11) in a core from the Porcupine Abyssal Plain. However, even at such localities, meiobenthos living in the upper 5 cm of sediment in the northeast Atlantic should not normally experience a lack or shortage of oxygen.

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