Data/hora: 01/06/2024 09:51:33

Provedor de dados: | 5
País: | France
Título: | Long-term variability of the Abra alba community in the southern bight of the North Sea
Autores: | Carpenter, P; Dewarumez, Jm; Lepretre, A.
Data: | 1997
Ano: | 1997
Palavras-chave: | Long-term trends; Time series; Multivariate; Methods; Benthos.
Resumo: | The Abra alba community from the Gravelines area has been studied since 1976. During this period, sudden and unpredictable variations of the species composition have been observed. These important changes affect a limited number of species without changing the bionomical structure of the community. The species in question are found to be characteristic of this community, and are the more abundant ones. Multivariate statistical methods were used to study quantitative data on the benthic population collected from 1978 to 1992. This analysis was performed in association with air temperature data. Results showed the existence of a six- or seven-year cycle, and this is confirmed by the observation of two complete periods. This cycle, which is found to be related to variations in climatic conditions, is generated by characteristic species of the community. Nevertheless, the species mainly responsible for the two ''maxima'' phases of the cycle are not the same. A different situation emerges during the years 1991-1992, with a new incoming species, Ensis directus, and modification of the nature of the sediment. The study of the community performed without the representative species, taking into account less abundant and less frequent species, shows a different kind of trend.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00093/20398/18065.pdf
Editor: | Gauthier-Villars
Relação: | http://archimer.ifremer.fr/doc/00093/20398/
Formato: | application/pdf
Fonte: | Oceanolica Acta (0399-1784) (Gauthier-Villars), 1997 , Vol. 20 , N. 1 , P. 283-290