Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.3/825
Título: Now you see me, now you don't : a case study of the effect of the sampling method on the perceived struture of Ichthyological communities
Autor: Azevedo, José M. N.
Palavras-chave: Ichthyological Communities
Rotenone Collections
Visual Census
Data: 2000
Editora: Universidade dos Açores
Citação: AZEVEDO, J.M.N., (2000). Now you see me, now you don’t: a case study of the effect of the sampling method on the perceived structure of ichthyological communities. “Arquipélago, Life and Marine Sciences”, Supl. 2(A): 133-143.
Relatório da Série N.º: Arquipélago, Life and Marine Sciences;Supl. 2(A)
Resumo: The fish community of a small rocky area near Ponta Delgada, Azores, was assessed using two methods: visual census and rotenone collections. The results obtained with each method are analysed and compared. A total of 46 species was recorded for this site. The visual census recorded more species than did the rotenone collections, but each method detected species that escaped the other. The total fish diversity was found to be similar to that reported in other localized studies of littoral rocky areas of the eastern Atlantic and the Mediterranean. Each method used revealed a different spatial structure and different trophic relationships of the ichthyological community. The visual census put in evidence the pelagic/demersal component, while the rotenone collections emphasized the benthic one. Both methods agree on the importance of the benthic primary production in the trophic food web. Visual census data further suggest that the relevance of the direct consumption of algal material by omnivores and herbivores is greater than could be guessed by the species diversity in this group. Strategies are discussed for combining visual and destructive sampling methods in order to achieve a more accurate representation of a given fish community.
Descrição: Fauna and Flora of the Atlantic Islands : Proceedings of the 3rd Symposium, Ponta Delgada, 21-25-September 1998.
URI: http://hdl.handle.net/10400.3/825
ISSN: 0873-4704
Aparece nas colecções:DBIO - Artigos em Revistas Nacionais / Articles in National Journals



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