Fish diversity and distribution in the Gambia Estuary, West Africa, in relation to environmental variables
| Autor: | Jean-Jacques Albaret, Jean Raffray, Luis Tito de Morais, Jean-Marc Ecoutin, Famara Sambou Darboe, Monique Simier |
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| Přispěvatelé: | Institut de recherche pour le développement (IRD [Sénégal]), Réponses adaptatives des populations et des peuplements de poissons aux pressions de l'environnement (RAP), Institut de Recherche pour le Développement (IRD), UMR 212 EME 'écosystèmes marins exploités' (EME), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM), Department of Fisheries (DoF) |
| Rok vydání: | 2004 |
| Předmět: |
0106 biological sciences
Pollution SALINITE STRUCTURE DU PEUPLEMENT Range (biology) Fauna media_common.quotation_subject Biodiversity DIVERSITE SPECIFIQUE Aquatic Science 010603 evolutionary biology 01 natural sciences West Africa 14. Life underwater fish assemblage DISTRIBUTION SPATIALE media_common Diversity geography geography.geographical_feature_category Ecology ACL IMPACT DE L'ENVIRONNEMENT 010604 marine biology & hydrobiology Estuary TURBIDITE 6. Clean water Salinity Disturbance (ecology) 13. Climate action ESTUAIRE [SDE.BE]Environmental Sciences/Biodiversity and Ecology Estuaries POISSON Hydrobiology |
| Zdroj: | Aquatic Living Resources Aquatic Living Resources, EDP Sciences, 2004, 17, pp.35--46. ⟨10.1051/alr:2004001⟩ |
| ISSN: | 0990-7440 1765-2952 |
| Popis: | indexedcc; International audience; The Gambia Estuary, a “normal” estuary with a decreasing salinity gradient from the mouth towards the head, is moderately exploited by small-scale fisheries and does not receive any severe pollution from either agriculture or industrial activities. Neither the Gambia River nor its estuary are artificially impounded. As the last large West African estuary free of major human disturbance, it is of considerable interest for comparative studies on the effect of major environmental perturbations in West African estuarine ecosystems. The aquatic environment and fish communities of the Gambia Estuary (about 250 km long) were studied by purse seine sampling at different periods in the river cycle, covering all hydro-climatic seasons that are characteristic of West African estuaries. Emphasis was placed on the diversity, composition, structure and distribution of fish assemblages in relation to fluctuations in physico-chemical factors such as water temperature, salinity and turbidity. Results on the aquatic environment, mainly the salinity range (from freshwater to 39) and dissolved oxygen (never a limiting factor for fish in the estuary) and on the main characteristics of the fish fauna (high diversity of life cycles, all the ecological categories represented) indicated that the Gambia Estuary was free of major climatic perturbation and reinforced the choice of this system as a reference for the study of the effects of major perturbations on estuarine tropical fish communities. |
| Databáze: | OpenAIRE |
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