Abstract
Prompt assessment and management actions are required if we are to reduce the current rapid loss of habitat and biodiversity worldwide. Statistically valid quantification of the biota and habitat condition in water bodies are prerequisites for rigorous assessment of aquatic biodiversity and habitat. We assessed the ecological condition of streams in a southeastern Brazilian basin. We quantified the percentage of stream length in good, fair, and poor ecological condition according to benthic macroinvertebrate assemblage. We assessed the risk of finding degraded ecological condition associated with degraded aquatic riparian physical habitat condition, watershed condition, and water quality. We describe field sampling and implementation issues encountered in our survey and discuss design options to remedy them. Survey sample sites were selected using a spatially balanced, stratified random design, which enabled us to put confidence bounds on the ecological condition estimates derived from the stream survey. The benthic condition index indicated that 62 % of stream length in the basin was in poor ecological condition, and 13 % of stream length was in fair condition. The risk of finding degraded biological condition when the riparian vegetation and forests in upstream catchments were degraded was 2.5 and 4 times higher, compared to streams rated as good for the same stressors. We demonstrated that the GRTS statistical sampling method can be used routinely in Brazilian rain forests and other South American regions with similar conditions. This survey establishes an initial baseline for monitoring the condition and trends of streams in the region.
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Acknowledgments
This work was sponsored by the Brazilian National Council for Scientific and Technological Development (Grant CNPq/PROEP 400107/2011-2). We are grateful to all LAPSA team members for field assistance, GIS data, and their contributions with the accomplishment of this study. We thank Beau Carrillo for support with writing, Bob Hughes and Tony Olsen for their valuable comments and help with sampling design, and two anonymous reviewers for their contributions to the final manuscript.
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Jiménez-Valencia, J., Kaufmann, P.R., Sattamini, A. et al. Assessing the ecological condition of streams in a southeastern Brazilian basin using a probabilistic monitoring design. Environ Monit Assess 186, 4685–4695 (2014). https://doi.org/10.1007/s10661-014-3730-9
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DOI: https://doi.org/10.1007/s10661-014-3730-9