Reliable sample sizes for estimating similarity among macroinvertebrate assemblages in tropical streams

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dc.creatorSchneck, Fabiana
dc.creatorMelo, Adriano Sanches
dc.date.accessioned2015-10-08T17:29:15Z
dc.date.available2015-10-08T17:29:15Z
dc.date.issued2010-06-16
dc.descriptionv. 46, n. 2, p. 93-100, 2010.pt_BR
dc.description.resumoStudies in tropical streams are relatively few, and one of the still-unresolved methodological issues is sample size. Adequate sample size for temperate streams cannot be extrapolated for tropical sites, because of the differences in species richness and the proportions of rare species. We evaluated reliable sample size for estimation of resemblance among samples of macroinvertebrate assemblages inhabiting riffles of tropical streams, using the autosimilarity approach. Sample sizes were much larger than those currently employed in tropical studies. Sampling units consisted of individuals associated with single stones (15–20 cm). Evaluations employed the Bray-Curtis index for abundance data and the equivalent Sorensen index for presence-absence data. Autosimilarity curves were constructed using both sampling units and individuals. The estimation of resemblance among samples was strongly dependent upon sample size at reduced sampling effort, particularly for the Bray-Curtis index. For the same sampling effort, fixed counts of individuals obtained randomly from sampling units gave better estimations of resemblance, and their similarity curves tended to stabilize earlier than those using sampling units. A minimum of 9–15 sampling units (stones) or 150–850 individuals is necessary for adequate estimations of resemblance using presence-absence data, and 13–18 sampling units or 750–1550 individuals are required for relative abundance data in tropical streams.pt_BR
dc.identifier.citationSCHNECK, Fabiana; MELO, Adriano S. Reliable sample sizes for estimating similarity among macroinvertebrate assemblages in tropical streams. Annales de Limnologie, v. 46, n. 2, p. 93-100, 2010. Disponível em: <http://www.limnology-journal.org/articles/limn/pdf/2010/02/limn10013.pdf>.pt_BR
dc.identifier.doihttp://dx.doi.org/10.1051/limn/2010013
dc.identifier.urihttp://www.limnology-journal.org/articles/limn/pdf/2010/02/limn10013.pdf
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/11100
dc.language.isoengpt_BR
dc.publisher.countrybrasilpt_BR
dc.publisher.programPrograma de Pós-Graduação em Ecologia e Evoluçãopt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectAutosimilaritypt_BR
dc.subjectSample representativenesspt_BR
dc.subjectSampling effortpt_BR
dc.subjectPecies richnesspt_BR
dc.subjectSpecies relative abundancespt_BR
dc.titleReliable sample sizes for estimating similarity among macroinvertebrate assemblages in tropical streamspt_BR
dc.typeArtigopt_BR

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