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Tipo do documento: Artigo
Título: Defining quantitative stream disturbance gradients and the additive role of habitat variation to explain macroinvertebrate taxa richness
Autor: Ligeiro, Raphael
Hughes, Robert M.
Kaufmann, Philip R.
Macedo, Diego R.
Firmiano, Kele R.
Ferreira, Wander R.
Oliveira, Déborah
Melo, Adriano Sanches
Callisto, Marcos
Abstract: Most 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.
Palavras-chave: Reference condition approach
Local disturbances
Catchment disturbances
Disturbance indices
Stream habitats
EPT assemblages
País: brasil
Programa: Programa de Pós-Graduação em Ecologia e Evolução
Citação: LIGEIRO, 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: <>.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1016/j.ecolind.2012.09.004
Identificador do documento: 10.1016/j.ecolind.2012.09.004
Data de publicação: Fev-2013
Aparece nas coleções:ICB - Artigos publicados em periódicos

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