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dc.creatorBenone, N. L.-
dc.creatorEsposito, M. C.-
dc.creatorJuen, L.-
dc.creatorPompeu, P. S.-
dc.creatorMontag, L. F. A.-
dc.date.accessioned2018-11-17T10:58:14Z-
dc.date.available2018-11-17T10:58:14Z-
dc.date.issued2017-06-
dc.identifier.citationBENONE, N. L. et al. Regional controls on physical habitat structure of Amazon streams. River Research and Applications, [S.l.], v. 33, n. 5, p. 766-776, June 2017.pt_BR
dc.identifier.urihttps://onlinelibrary.wiley.com/doi/full/10.1002/rra.3137pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/31784-
dc.description.abstractDrainage basins are inherently hierarchical and are composed of a series of nested subsystems, in which the functions and structure of lower levels depend on the features of higher levels. For a comprehensive understanding of the functioning of river systems, it is necessary to identify which factors are important at different scales and how they interact. Considering the importance of assessing lotic systems in the Amazon, our aim was to answer the following question: how do regional features at catchment scale constrain local physical habitat of streams? We sampled 55 streams distributed among six protected river basins of the Amazon, examining the associations of 11 catchment metrics with 146 local variables describing physical habitat structure derived from field measurements. Multivariate analyses showed that basins were structured according to different factors at both scales; variables related to substrate, cover for aquatic organisms and fast channel habitats were explained by altitude, catchment slope and proportion of coarse fragments in soils. Altitude was the most important catchment variable, strongly affecting flow velocity and regulating channel morphology and sediment transport. Spatial differences in environmental heterogeneity indicate that different processes act at each scale; this emphasizes how difficult it is to choose the most relevant spatial scale in ecological studies. Our results highlight the importance of regional variables, especially altitude and slope, as drivers of local‐scale environmental heterogeneity. We hope these results will help in developing more efficient monitoring projects and restoration practices to better understand and conserve aquatic resources in the Amazon Basin.pt_BR
dc.languageen_USpt_BR
dc.publisherWileypt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceRiver Research and Applicationspt_BR
dc.subjectPhysical habitatpt_BR
dc.subjectAquatic ecosystempt_BR
dc.subjectEnvironmental heterogeneitypt_BR
dc.subjectProtected areaspt_BR
dc.subjectFluvial hierarchypt_BR
dc.titleRegional controls on physical habitat structure of Amazon streamspt_BR
dc.typeArtigopt_BR
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