Spatio-temporal Variability of Acartia clausi (Copepoda, Calanoida) Population Structure, Abundance, Body Length, and Biomass in a Tropical Coastal Lagoon (Grand-Lahou, Côte d’Ivoire)

Spatio-temporal Variability of Acartia clausi (Copepoda, Calanoida) Population Structure, Abundance, Body Length, and Biomass in a Tropical Coastal Lagoon (Grand-Lahou, Côte d’Ivoire)

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Author(s)

Author(s): Raphaël N’doua Etilé, Georges Kassi Blahoua, Théophile Aké Bédia, Paul Essetchi Kouamelan, Valentin N’Douba

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DOI: 10.18483/ijSci.1296 148 496 16-28 Volume 6 - Jun 2017

Abstract

The spatial and seasonal variations of Acartia clausi population structure, abundance, biomass and body length variation in relationship to environmental variables were investigated in the Grand-Lahou lagoon at 21 stations from January to December 2004. A. clausi abundance, biomass and body (prosome) length showed considerable seasonal and spatial variation. On average, total population abundance and biomass obtained during the dry season (Mean: 7.11 ind/l and 9.08 µgC/l respectively) were higher than that those which have gotten during the wet season (Mean: 2.98 ind/l and 2.76 µgC/l respectively). The same tendency was registered for prosome length of all development stages, with 275-1000 µm during the dry season versus 225-975 µm during the wet season. A. clausi population (without the nauplii) was dominated by copepodids stages in all seasons. During the dry season, on average, copepodids stages constituted 76.65% of total density and 52.98% of total biomass. During the wet season, copepodids stages represented 92.23% of total density and 72.42% of total biomass. In the adults stages, on average females (F) were more numerous than males (M), with a sex ratio (M/F) of 0.75. However, males were slightly more abundant than females during the dry season (February to April and September) with sex ratio (M/F) range from 1.10 to 1.46. Correlation on data of this study analyses showed that spatio-seasonal variations of A. clausi abundance, Biomass and Body length were mainly linked to water salinity, pH, transparency and dissolved oxygen, phosphates and nitrates concentrations.

Keywords

Acartia clausi, Population Structure, Abundance and Biomass, Body Length, Tropical Lagoon

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