Data/hora: 09/06/2024 06:05:08

Provedor de dados: | 5
País: | France
Título: | Macrobenthic communities on the continental shelf of Cote-d'Ivoire. Seasonal and diel cycles in relation to hydroclimate
Autores: | Le Loeuff, P; Intes, A.
Data: | 1999-09
Ano: | 1999
Palavras-chave: | Faune benthique; Golfe de Guinée; Cycle saisonnier; Cycle circadien; Perturbation; Benthic fauna; Gulf of Guinea; Seasonal cycle; Diel cycle; Perturbation.
Resumo: | Benthic communities of the shrimp (Penaeus notialis) grounds off Grand-Bassam, Cote-d'Ivoire, exhibit distinct variations, correlated to annual changes in hydroclimate, characterized by warm and cold (upwelling) seasons. These changes appear to be the result of the well-defined reproduction periods of many short-living benthic species, as clearly shown by the peaks of abundance in the samples, at different times of the year, but quite often at the end of the cold and the beginning of the warm seasons (September-November). Many species show marked diel rhythms, either diurnal (pagurids, brachyurans) or nocturnal (macrurans, brachyurans, molluscs), so that the species composition displays distinct differences between day and night samples (February 1970 survey). This diel rhythm can be disturbed at the beginning of the rainy season (May 1969 survey) by the passing of turbid water lenses over the bottom, drifted from the Ebrie lagoon mouth, close to the study site. The diel cycles of some species (stomatopods) appear to be completely altered by the reduced light intensity near the bottom whereas others (some pagurids and brachyurans) are practically unaffected: they seem to be governed by internal physiological mechanisms or they need only a very low threshold of light to maintain their rhythms. So the differences between day and night samples are appreciably reduced, as shown by Correspondence Analysis.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00325/43601/43985.pdf

DOI:10.1016/S0399-1784(00)87685-9

http://archimer.ifremer.fr/doc/00325/43601/

Editor: | Gauthier-villars/editions Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 1999-09 , Vol. 22 , N. 5 , P. 529-550

Fonte:

1999 Ifremer / CNRS / IRD / Editions scientifiques et medicales Elsevier SAS

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