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Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)

The general aim of this study is to update the inventory of the fish species and to specify distribution patterns in the Nero River ichthyofauna in order to establish some basis for the conservation of these fish communities and their habitat. From February 2009 to January 2010, thirty-three sites w...

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Autores principales: N’Zi, Konan Gervais, Yao, Stanislas Silvain, Gooré Bi, Gouli, Ndouba, Valentin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4423652/
https://www.ncbi.nlm.nih.gov/pubmed/25972747
http://dx.doi.org/10.1016/j.sjbs.2014.11.007
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author N’Zi, Konan Gervais
Yao, Stanislas Silvain
Gooré Bi, Gouli
Ndouba, Valentin
author_facet N’Zi, Konan Gervais
Yao, Stanislas Silvain
Gooré Bi, Gouli
Ndouba, Valentin
author_sort N’Zi, Konan Gervais
collection PubMed
description The general aim of this study is to update the inventory of the fish species and to specify distribution patterns in the Nero River ichthyofauna in order to establish some basis for the conservation of these fish communities and their habitat. From February 2009 to January 2010, thirty-three sites were sampled monthly with gill nets and a backpack electrofisher, and environmental variables were recorded. Overall, 46 species included in 33 genuses, 24 families and 9 orders were collected. Eleven families and 30 species were the first records for the Nero River. Including all species previously listed in the literature, the number of species presently known in the Nero River and its tributaries is revised to 59. Four families, Alestidae (21%), Schilbeidae (19%), Cyprinidae (17%) and Cichlidae (16%) that made up 73% of the total number of the catches, were the most dominant. The most dominant numerical species were Schilbe mandibularis and Brycinus longipinnis. Fish species and sampling sites along with eight environmental variables were ordinated with canonical correspondence analysis (CCA) coupled to the Monte Carlo test. Ecological status based on fish assemblage according to environmental variables and anthropogenic pressures showed that miss dead wood leaves and roots, electrical conductivity, total dissolved solids, mud, nitrite, basin width, dissolved oxygen and pH, were the primary factors influencing fish distribution. The environmental tolerance index (ETI), ecological tolerance (t(k)) and optima (u(k)) values of 10 species to 8 different environmental variables were analyzed. Six species (Hemichromis fasciatus, Epiplatys chaperi, Barbus ablabes, B. longipinnis, Hemichromis bimaculatus and Chromidotilapia guntheri) have high ETI and a cosmopolitan distribution in the Nero River. In the tributaries of the middle course, high concentrations of nitrite in the water, added to the presence of a lot of tolerant species in the ichthyofauna are indications of disturbance of these areas. Subsequent recommendations were formulated for efficient restoration and conservation management of this River.
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spelling pubmed-44236522015-05-13 Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa) N’Zi, Konan Gervais Yao, Stanislas Silvain Gooré Bi, Gouli Ndouba, Valentin Saudi J Biol Sci Original Article The general aim of this study is to update the inventory of the fish species and to specify distribution patterns in the Nero River ichthyofauna in order to establish some basis for the conservation of these fish communities and their habitat. From February 2009 to January 2010, thirty-three sites were sampled monthly with gill nets and a backpack electrofisher, and environmental variables were recorded. Overall, 46 species included in 33 genuses, 24 families and 9 orders were collected. Eleven families and 30 species were the first records for the Nero River. Including all species previously listed in the literature, the number of species presently known in the Nero River and its tributaries is revised to 59. Four families, Alestidae (21%), Schilbeidae (19%), Cyprinidae (17%) and Cichlidae (16%) that made up 73% of the total number of the catches, were the most dominant. The most dominant numerical species were Schilbe mandibularis and Brycinus longipinnis. Fish species and sampling sites along with eight environmental variables were ordinated with canonical correspondence analysis (CCA) coupled to the Monte Carlo test. Ecological status based on fish assemblage according to environmental variables and anthropogenic pressures showed that miss dead wood leaves and roots, electrical conductivity, total dissolved solids, mud, nitrite, basin width, dissolved oxygen and pH, were the primary factors influencing fish distribution. The environmental tolerance index (ETI), ecological tolerance (t(k)) and optima (u(k)) values of 10 species to 8 different environmental variables were analyzed. Six species (Hemichromis fasciatus, Epiplatys chaperi, Barbus ablabes, B. longipinnis, Hemichromis bimaculatus and Chromidotilapia guntheri) have high ETI and a cosmopolitan distribution in the Nero River. In the tributaries of the middle course, high concentrations of nitrite in the water, added to the presence of a lot of tolerant species in the ichthyofauna are indications of disturbance of these areas. Subsequent recommendations were formulated for efficient restoration and conservation management of this River. Elsevier 2015-05 2014-11-12 /pmc/articles/PMC4423652/ /pubmed/25972747 http://dx.doi.org/10.1016/j.sjbs.2014.11.007 Text en © 2014 The Authors http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).
spellingShingle Original Article
N’Zi, Konan Gervais
Yao, Stanislas Silvain
Gooré Bi, Gouli
Ndouba, Valentin
Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)
title Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)
title_full Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)
title_fullStr Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)
title_full_unstemmed Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)
title_short Update of ichthyofauna diversity and ecological status of a coastal River Nero (Côte d’Ivoire – West Africa)
title_sort update of ichthyofauna diversity and ecological status of a coastal river nero (côte d’ivoire – west africa)
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4423652/
https://www.ncbi.nlm.nih.gov/pubmed/25972747
http://dx.doi.org/10.1016/j.sjbs.2014.11.007
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