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On the distribution of shrimp in West African waters
Burukovskii, RN. (1998). On the distribution of shrimp in West African waters. ZooL. Zh. = Russ. J. Zool. 2(3): 778-787
In: Zoologicheskij Zhurnal = Russian Journal of Zoology. Akademiâ nauk SSSR: Moskva. ISSN 0044-5134; e-ISSN 1560-0912
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| Abstract |
About 250 shrimp species inhabit the waters of West Africa. They belong to three faunal complexes,corresponding to the following zoogeographical regions: Mediterranean-Lousitanian region (Mauritania prov-ince), West African tropical region, and Indian-West Pacific region (South African province). Boundariesbetween the West African tropical and adjacent regions lie in the sublittoral zone at 15°-16° N and 12°-13° S;in the outer shelf, the boundaries shift to the north and south to 21° N and 17° S, respectively. For the speciesof the shelf and of the continental slope, the northern boundary is situated at 26° N. The southern boundary isat about 22° S for shrimp living at the shelf border and at 26° S for shrimp of the slope. At greater depths, thetropical zoogeographic regions broaden (a phenomenon of equatofugal deepwater shift). To the south of thesouthern boundary and to the north of the northern boundaries of the West African tropical zoogeographicalregion, there are antiecotones, i.e., areas where shrimp species are scarce, their abundance is low (to total dis-appearance), species dominating in the persisting taxocenoses do not dominate in the adjacent regions, andendemics are absent. These zones are situated symmetrically to the equator and correspond to the increase ofupwelling in summer. As a result of upwelling, in subtropical regions, there are some areas with low bottomtemperatures similar to those in the temperate zone. Therefore, no tropical and subtropical species can inhabitthese waters. |
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