BIOGEOGRAPHY AND COMMUNITY STRUCTURE OF THE DECAPOD CRUSTACEAN FAUNA OFF NAMIBIA (SOUTHEAST ATLANTIC)

被引:48
作者
MACPHERSON, E
机构
关键词
D O I
10.2307/1548466
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
The communities of pelagic and benthic decapod crustaceans off Namibia (Southeast Atlantic) were studied. The samples comprised 97 species differing widely in their geographical and depth distribution. The analyses revealed distinct assemblages, with several well-defined boundaries. However, the barriers were different for pelagic and benthic species. The zonation of the pelagic species presented two clearly differentiated communities, an "inshore associations" from the coast to about 70 miles (113 km) offshore, largely coinciding with the self, and an "offshore association" more than 70 miles off the coast. Both associations were present in the active (September-October) and quiescent (April) upwelling period, although during the active upwelling period the number of species clearly decreased. These results support the existence of different circulation patterns over the shelf and slope separated by a cross-shelf barrier. A third association seemed to be related to the seasonal intrusion of waters from Angola during the quiescent upwelling period. The communities of benthic species were mainly delimited by the depth, although several latitudinal boundaries exist. The bathymetric boundaries were well defined: the main boundary was located around 400 m, separating the shelf and slope-bathyal species. The latitudinal boundaries seemed to be related to different features of the Benguela upwelling and the circulation pattern in the region.
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页码:401 / 415
页数:15
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