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Short-term effects of coastal upwelling and wind reversals on epiplanktonic cnidarians in the southern Benguela ecosystem

AuthorsPagès, Francesc ; Verheye, H.M.; Gili, Josep Maria ; Flos, Jordi
Issue Date1991
PublisherNational Inquiry Services Centre (South Africa)
CitationSouth African Journal of Marine Science 10: 203-211 (1991)
AbstractPatterns in the distribution of epiplanktonic cnidarians collected along the west coast of South Africa during June 1986 were examined. Upwelling-favourable south-easterly winds prevailed prior to sampling. These winds are believed to have transported coastal cnidarian assemblages offshore, resulting in a blurring of the inshore-offshore zonation of species. A wind reversal, to northerly winds in the north and north-westerly winds in the south, followed upwelling and persisted during sample collection. This resulted in the development of a distinct thermohaline front off Cape Columbine. Another consequence was the advection of oceanic water shorewards in the south, disrupting the original pattern of species zonation and redistributing cnidarian assemblages in a longshore pattern. Three different assemblages are differentiated: one north of Cape Columbine, consisting of coastal species, one south of Cape Columbine with a mixture of neritic and oceanic species, and one single-species community with coastal affinity inshore north of Cape Columbine. The effects of wind-driven onshore advection of offshore waters on the coastal communities of gelatinous zooplankters are discussed
Description9 pages, 9 figures, 1 table
Publisher version (URL)https://doi.org/10.2989/02577619109504632
Appears in Collections:(ICM) Artículos
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