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Zooplankton diversity and distribution in a Fresco Lagoon (West Africa, Côte d'Ivoire)

Author Affiliations

  • 1Laboratoire d'Hydrobiologie et d'Ecotechnologie des Eaux, UFR Biosciences, Université Félix HOUPHOUËT-BOIGNY Abidjan-Cocody, 22 BP582, Abidjan, Côte d'Ivoire
  • 2Centre de Recherches Océanologiques (CRO), BPV 18, Abidjan, Côte d'Ivoire
  • 3Laboratoire d'Hydrobiologie et d'Ecotechnologie des Eaux, UFR Biosciences, Université Félix HOUPHOUËT-BOIGNY Abidjan-Cocody, 22 BP582, Abidjan, Côte d'Ivoire
  • 4Laboratoire d'Hydrobiologie et d'Ecotechnologie des Eaux, UFR Biosciences, Université Félix HOUPHOUËT-BOIGNY Abidjan-Cocody, 22 BP582, Abidjan, Côte d'Ivoire
  • 5Laboratoire d'Hydrobiologie et d'Ecotechnologie des Eaux, UFR Biosciences, Université Félix HOUPHOUËT-BOIGNY Abidjan-Cocody, 22 BP582, Abidjan, Côte d'Ivoire

Int. Res. J. Environment Sci., Volume 7, Issue (10), Pages 9-20, October,22 (2018)

Abstract

Our objective during this study was to determine Fresco lagoons zooplankton fauna composition, abundance and biomass spatial and temporal variation in relation to some environment parameters. Zooplankton organisms were collected monthly during an annual cycle (August 2013 to September 2014) in five sampling sites. This lagoonal ecosystem zooplankton community was composed of 54 taxa including Copepoda (42.59%), Cladoceran (14.81%) Rotifera (9.26%), and other zooplankton organisms (33.34%). Fresco lagoon zooplankton community diversity was mainly dominated by zooplankton marine taxa (54.72%), followed by freshwater and brackish taxa with 22.64% each. In Fresco lagoon, zooplankton abundance varied from 207 ind/l(mean) during the rainy season to 296 ind/l (mean) throughout the dry season. During the rainy season, zooplankton abundance varied from 45 to 387 ind/l according to stations while it varied from 29 to 579 ind/l throughout the dry season. All these variation were statistically significant (p < 0.01). Fresco zooplankton community was mainly dominated by Copepoda taxa (main 98 % of total abundance), with Oithona brevicornis (56.11%) and Acartia clausi (33.26%) as main species. This study revealed also that, in Fresco lagoon, zooplankton taxa in stations far from of the channel were mainly influenced by pH, Salinity and conductivity while in stations near of the channel zooplankton composition and abundance variation were mainly under dissolved oxygen, phosphates and ammonium concentrations influence.

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