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dc.creatorLigeiro, Raphael-
dc.creatorMelo, Adriano Sanches-
dc.creatorCallisto, Marcos-
dc.identifier.citationLIGEIRO, Raphael.; MELO, Adriano S.; CALLISTO, Marcos. Spatial scale and the diversity of macroinvertebrates in a neotropical catchment. Freshwater Biology (Print), v. 55, p. 424-435, 2010. Disponível em: <>.pt_BR
dc.descriptionv. 55, p. 424-435, 2010.pt_BR
dc.description.abstract1. Lotic ecosystems can be studied on several spatial scales, and usually show high heterogeneity at all of them in terms of biological and environmental characteristics. Understanding and predicting the taxonomic composition of biological communities is challenging and compounded by the problem of scale. Additive diversity partitioning is a tool that can show the diversity that occurs at different scales. 2. We evaluated the spatial distribution of benthic macroinvertebrates in a tropical headwater catchment (S.E. Brazil) during the dry season and compared alpha and beta diversities at the scales of stream segments, reaches, riffles and microhabitats (substratum types: gravels, stones and leaf litter). We used family richness as our estimate of diversity. Sampling was hierarchical, and included three stream segments, two stream reaches per segment, three riffles per reach, three microhabitats per riffle and three Surber sample units per microhabitat. 3. Classification analysis of the 53 families found revealed groups formed in terms of stream segment and microhabitat, but not in terms of stream reaches and riffles. Separate partition analyses for each microhabitat showed that litter supported lower alpha diversity (28%) than did stones (36%) or gravel (42%). In all cases, alpha diversity at the microhabitat scale was lower than expected under a null model that assumed no aggregation of the fauna. 4. Beta diversity among patches of the microhabitats in riffles depended on substratum type. It was lower than expected in litter, similar in stone and higher in gravel. Beta diversities among riffles and among reaches were as expected under the null model. On the other hand, beta diversity observed was higher than expected at the scale of stream segments for all microhabitat types. 5. We conclude that efficient diversity inventories should concentrate sampling in different microhabitats and stream sites. In the present study, sampling restricted to stream segments and substratum types (i.e. excluding riffles and stream reaches) would produce around 75% of all observed families using 17% of the sampling effort employed. This finding indicates that intensive sampling (many riffles and reaches) in few stream segments does not result in efficient assessment of diversity in a region.pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectBeta diversitypt_BR
dc.subjectDiversity partitioningpt_BR
dc.subjectTaxa richnesspt_BR
dc.titleSpatial scale and the diversity of macroinvertebrates in a neotropical catchmentpt_BR
dc.publisher.programPrograma de Pós-Graduação em Ecologia e Evoluçãopt_BR
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