Spatial and temporal variability in particle-bound pesticide exposure and their effects on benthic community structure in a temporarily open estuary |
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| Authors: | S Bollmohr PJ van den Brink PW Wade JA Day R Schulz |
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| Institution: | 1. Freshwater Research Unit, University of Cape Town, Private Bag, Rondebosch 7701, South Africa;2. Institute for Environmental Sciences, University Koblenz-Landau, D-76829 Landau/Pfalz, Germany;3. Alterra, Centre for Water and Climate, Wageningen University and Research Centre, P.O. Box 47, 6700AA Wageningen, The Netherlands;4. Department of Aquatic Ecology and Water Quality Management, Wageningen University and Research Centre, P.O. Box 47, 6700AA Wageningen, The Netherlands;5. Environmental Geoscience Unit, Council for Geoscience, Private Bag X112, Pretoria 0001, South Africa |
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| Abstract: | Spatial and temporal variations in particle-bound pesticide contamination, natural environmental variables, and benthic abundance were measured during the dry summer season within a temporarily open estuary (Lourens River). This study focused on the effect of particle-associated pesticides on the dynamics of the benthic community (including epi-benthic, hyper-benthic, and demersal organisms) by comparing two runoff events, differing in their change in pesticide concentration and environmental variables. The two chosen sites were situated within the upper and middle reaches of the estuary and differ significantly in salinity (p = 0.001), flow (p = 0.5), temperature (p < 0.001) and particulate organic carbon in the sediment (p < 0.001). Generally higher particle-bound pesticides were found in the upper reaches. |
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| Keywords: | contaminated sediments chlorpyrifos endosulfan salinity total organic carbon copepods |
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