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Suficiencia de muestreo para ensambles de peces en ríos del bosque tropical del Atlántico, en el sureste de Brasil
Author(s) -
Freitas Terra Bianca,
Hughes Robert M.,
Araújo Francisco Gerson
Publication year - 2013
Publication title -
fisheries
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 79
eISSN - 1548-8446
pISSN - 0363-2415
DOI - 10.1080/03632415.2013.775572
Subject(s) - electrofishing , species richness , streams , dominance (genetics) , ecology , benthic zone , sampling (signal processing) , temperate climate , channel (broadcasting) , species diversity , environmental science , biology , geography , habitat , computer network , biochemistry , filter (signal processing) , computer science , gene , electrical engineering , computer vision , engineering
Knowledge of the adequacy of field sampling protocols is critical for detecting species and assessing biological conditions. Several studies have been conducted to determine the appropriate electrofishing distance for estimating fish assemblage richness in temperate North American streams. We tested whether electrofishing 40 times the mean wetted channel width was sufficient for estimating species richness and developing precise metrics for Atlantic Forest streams in southeastern Brazil. We sampled 32 sites with differing gradients, substrates, and anthropogenic pressures. Our results show that 40 channel widths were not sufficient to estimate species richness in those systems, presumably because of the high number of rare species. However, 40 channel widths were sufficient for applying other metrics of assemblage condition (e.g., number of common species, percentage of tolerant individuals, percentage of Characiform species, percentage of Siluriform species, percentage of water column species, percentage benthic species, Shannon diversity, dominance). This suggests that 40 channel widths are an appropriate sampling distance for applying environmental assessment protocols to Atlantic Forest streams.