Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1510
Título: An interference visual census technique applied to cryptobenthic fish assemblages
Autor: Beldade, Ricardo
Gonçalves, Emanuel João
Data: 2007
Editora: Observatoire Océanologique/Laboratoire Arago
Citação: Vie et Milieu: Life and Environment, 57, 61-65
Resumo: We compare the accuracy of an interference visual census technique (IVC), in which dismantling of the habitat is performed, to traditional underwater visual census (VC) and anaesthetic census. We compare the performance of these techniques applied to a temperate cryptobenthic fish assemblage using two strategies: sampling over the whole depth extent of the rocky bottom, and stratified sampling over the main microhabitats present at the study site. T h e number of species encountered was lower using the traditional VC. Fish density estimates were significantly higher using the interference technique compared to the traditional VC, in the transect strategy. These differences were larger for clingfishes and some gobies which occurred preferably under cobble and small rocks. No differences were found when comparing the IVC and anaesthetic census in the habitat strategy, for each microhabitat considered. We conclude that dismantling the habitat increases the performance of the visual census technique and is therefore a valuable approach when applied to temperate cryptobenthic fish assemblages.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1510
ISSN: 0240-8759
Aparece nas colecções:UIE-E - Artigos em revistas internacionais

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