Abstract
Purpose
While environmental risks associated with petroleum extraction such as oil spills or leaks are relatively well known, little attention has been given to the impacts of silt. The increase in petroleum exploitation in Amazonia has resulted in sediment input to aquatic systems, with impacts on their biodiversity. Here we use a combination of field measurements and statistical analyses to evaluate the impacts of anthropogenic silt derived from the construction of roads, borrow pits, and wells during the terrestrial development of gas and oil, on macroinvertebrate communities in streams of the Urucu Petroleum Province in the Central Brazilian Amazon.
Material and methods
Ten impacted and nine non-impacted streams were sampled in January, April, and November of 2007. Macroinvertebrates were sampled along a 100-m continuous reach in each stream at 10-m intervals using a dip net. Abiotic variables including, a siltation index (SI), suspended inorganic sediment (SIS), sediment color index (SCI), suspend organic sediment (SOS), pH, electrical conductivity, dissolved oxygen, temperature, water velocity, channel width, and depth, were measured at three equidistant points in each stream (∼30-m intervals).
Results and discussion
SI did not differ between impacted and undisturbed streams. SIS was higher and SCI lower (more reddish) in impacted than in non-impacted streams. SCI had a positive and SIS a negative effect on both macroinvertebrate richness and density. SIS and SCI also influenced macrophyte taxonomic composition. In impacted streams, taxonomic richness and density were 1.5 times lower than in non-impacted streams. No taxon was significantly associated with impacted streams. SIS was positively correlated with SOS and electrical conductivity while SCI was negatively correlated with SOS, electrical conductivity, and pH. The lack of difference in SI between impacted and non-impacted streams suggests that anthropogenic sediment does not accumulate on stream beds. The reddish color of SIS in impacted streams reflects terrestrial erosion and indicates the rapid flow of suspended sediments through these reaches, impacting macroinvertebrate richness, density, and species composition.
Conclusions
Anthropogenic suspended silt has had a significant negative impact on aquatic macroinvertebrate diversity and density in streams in the Urucu Petroleum Province. Soil conservation measures are needed to reduce silt inputs and restore these streams to their natural condition. Additional studies are also needed to investigate the dynamics of sediments in the impacted streams.
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Acknowledgements
We thank the National Council of Technological and Scientific Development (CNPq, CT-HIDRO 552697/2005-2), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and the Financiadora de Estudos e Projetos (FINEP) for funding this study. We thank the CAPES and CNPq for granting a doctoral fellowship the first author and we are grateful to the PETROBRAS S.A. for logistic support. We thank Dr. Ana O. Pes and Dr. Daniel Pimpão for their help in the identification of Trichoptera and Mollusca, and Dr. Philip M. Fearnside for revising the manuscript. Thanks also go to João B. Rocha, Gilcélio Jorge, and Jéferson Oliveira da Silva for help in the fieldwork.
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Couceiro, S.R.M., Hamada, N., Forsberg, B.R. et al. Effects of anthropogenic silt on aquatic macroinvertebrates and abiotic variables in streams in the Brazilian Amazon. J Soils Sediments 10, 89–103 (2010). https://doi.org/10.1007/s11368-009-0148-z
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DOI: https://doi.org/10.1007/s11368-009-0148-z