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An interference visual census technique applied to cryptobenthic fish assemblages
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Orientador(es)
Resumo(s)
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.
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Contexto Educativo
Citação
Vie et Milieu: Life and Environment, 57, 61-65
Editora
Observatoire Océanologique/Laboratoire Arago