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      Horizontal and vertical distribution of mesozooplankton species richness and composition down to 2,300 m in the southwest Atlantic Ocean

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          Abstract

          We describe the species richness, distribution and composition of mesozooplankton over the continental shelf and slope, and in the water masses in the Campos Basin, southwest Atlantic Ocean. We analyzed the mesozooplankton from two oceanographic cruises (rainy and dry seasons, 2009) with samples taken in five different water masses from the surface to 2,300 m depth. In the Subsurface Water (SS), in both sampling periods, more species were recorded over the slope (rainy: 100; dry: 128) than the continental shelf (rainy: 97; dry: 104). Over the slope, species richness decreased with increasing depth: the highest values were observed in the South Atlantic Central Water (SACW), and the lowest values in the North Atlantic Deep Water (NADW), in both sampling periods. We recorded 262 species in 10 groups (Hydrozoa, Siphonophora, Ctenophora, Branchiopoda, Copepoda, Euphausiacea, Decapoda, Chaetognatha, Appendicularia e Thaliacea), with 13 new occurrences for the southwest Atlantic. Copepoda was the group with the highest species richness, containing 138 species. In both periods, the samples from SS, SACW and Antarctic Intermediate Water (AAIW)/Upper Circumpolar Deep Water (UCDW) were clustered in different faunistic zones, based on species composition. This study confirmed that zooplankton richness in the southwest Atlantic Ocean is underestimated, and suggests that additional efforts must be directed toward a better understanding of this fairly unknown region.

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          Most cited references 61

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          On the total geostrophic circulation of the South Atlantic Ocean: Flow patterns, tracers, and transports

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            Deep pelagic biology

             Bruce Robison (2004)
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              On the marine free-living copepods off Brazil

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                zool
                Zoologia (Curitiba)
                Zoologia (Curitiba)
                Sociedade Brasileira de Zoologia (Curitiba )
                1984-4689
                October 2014
                : 31
                : 5
                : 445-462
                Affiliations
                [1 ] Universidade Federal do Rio de Janeiro Brazil
                [2 ] Universidade Federal do Espírito Santo Brazil
                [3 ] Universidade de São Paulo Brazil
                [4 ] Universidade Federal do ABC Brazil
                Article
                S1984-46702014000500005
                10.1590/S1984-46702014000500005

                http://creativecommons.org/licenses/by/4.0/

                Product
                Product Information: website
                Categories
                ZOOLOGY

                Animal science & Zoology

                zooplankton, Deep sea, southeastern Brazil, diversity

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