Defining quantitative stream disturbance gradients and the additive role of habitat variation to explain macroinvertebrate taxa richness

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dc.creatorLigeiro, Raphael
dc.creatorHughes, Robert M.
dc.creatorKaufmann, Philip R.
dc.creatorMacedo, Diego R.
dc.creatorFirmiano, Kele R.
dc.creatorFerreira, Wander R.
dc.creatorOliveira, Déborah
dc.creatorMelo, Adriano Sanches
dc.creatorCallisto, Marcos
dc.date.accessioned2015-10-09T18:07:48Z
dc.date.available2015-10-09T18:07:48Z
dc.date.issued2013-02
dc.descriptionv. 25, p. 45-57, fev. 2013.pt_BR
dc.description.abstractMost studies dealing with the use of ecological indicators and other applied ecological research rely on some definition or concept of what constitutes least-, intermediate- and most-disturbed condition. Currently, most rigorous methodologies designed to define those conditions are suited to large spatial extents (nations, ecoregions) and many sites (hundreds to thousands). The objective of this study was to describe a methodology to quantitatively define a disturbance gradient for 40 sites in each of two small southeastern Brazil river basins. The assessment of anthropogenic disturbance experienced by each site was based solely on measurements strictly related to the intensity and extent of anthropogenic pressures. We calculated two indices: one concerned site-scale pressures and the other catchment-scale pressures. We combined those two indices into a single integrated disturbance index (IDI) because disturbances operating at both scales affect stream biota. The local- and catchment-scale disturbance indices were weakly correlated in the two basins (r = 0.21 and 0.35) and both significantly (p < 0.05) reduced site EPT (insect orders Ephemeroptera, Plecoptera, Trichoptera) richness. The IDI also performed well in explaining EPT richness in the basin that presented the stronger disturbance gradient (R2 = 0.39, p < 0.001). Natural habitat variability was assessed as a second source of variation in EPT richness. Stream size and microhabitats were the key habitat characteristics not related to disturbances that enhanced the explanation of EPT richness over that attributed to the IDI. In both basins the IDI plus habitat metrics together explained around 50% of EPT richness variation. In the basin with the weaker disturbance gradient, natural habitat explained more variation in EPT richness than did the IDI, a result that has implications for biomonitoring studies.We conclude that quantitativelydefineddisturbance gradients offer a reliable andcomprehensive characterization of anthropogenic pressure that integrates data from different spatial scales.pt_BR
dc.identifier.citationLIGEIRO, Raphael; HUGHES, Robert M.; KAUFMANN, Philip R.; MACEDO, Diego R.; FIRMIANO, Kele R.; FERREIRA, Wander R.; OLIVEIRA, Déborah; MELO, Adriano S.; CALLISTO, Marcos. Defining quantitative stream disturbance gradients and the additive role of habitat variation to explain macroinvertebrate taxa richness. Ecological Indicators, v. 25, p. 45-57, Feb. 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1470160X12003214>.pt_BR
dc.identifier.doi10.1016/j.ecolind.2012.09.004
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S1470160X12003214
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/11123
dc.language.isoengpt_BR
dc.publisher.countrybrasilpt_BR
dc.publisher.programPrograma de Pós-Graduação em Ecologia e Evoluçãopt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectReference condition approachpt_BR
dc.subjectLocal disturbancespt_BR
dc.subjectCatchment disturbancespt_BR
dc.subjectDisturbance indicespt_BR
dc.subjectStream habitatspt_BR
dc.subjectEPT assemblagespt_BR
dc.titleDefining quantitative stream disturbance gradients and the additive role of habitat variation to explain macroinvertebrate taxa richnesspt_BR
dc.typeArtigopt_BR

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