Analysis of urban impacts on aquatic habitats in the central Amazon basin: Adult odonates as bioindicators of environmental quality

摘要: Abstract Thirty streams were surveyed in urban and natural settings the municipality of Manaus central Amazon basin (Brazil) with objective identifying species adult odonates that can be used as bioindicators environmental quality. The data collected to test hypothesis suborder Zygoptera are indicators better-preserved environments due their smaller body sizes reduced tolerances habitat modification, whereas Anisoptera presumed impacted habitats no vegetation. classified preserved, intermediate, degraded, based on characteristics. A total 908 specimens collected, representing 60 species. results indicator value (IndVal) identified 13 quality, which nine typical preserved habitats, two intermediate four modified (intermediate or degraded). Odonate richness declined increasing urbanization, a pattern also presented by zygopterans, although anisopteran was higher habitats. Zygopteran showed high fidelity/specificity for small number this similar relationship degraded anisopterans associated only disturbed Overall, indicate diagnosis odonate community provide rapid effective tool evaluation As many stenotopic, they good some more eurytopic