naa a22 4500 510749798 CHVBK 20180411083100.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11270-013-1650-x doi (NATIONALLICENCE)springer-10.1007/s11270-013-1650-x Effects of Vegetable Oil Pollution on Aquatic Macroinvertebrate Assemblage in a Freshwater Wetland and Its Use as a Remediation Tool [Elektronische Daten] [M. Selala, A-M. Botha, A. de Klerk, L. de Klerk, J. Myburgh, M. Blettler, P. Oberholster] The occurrence, as well as the environmental fate and impact, of vegetable oil spills in freshwater wetlands have until now been unreported. Thus, the largest global vegetable oil spillage in a freshwater wetland, which occurred at the Con Joubert Bird Sanctuary wetland in 2007, presented an ideal opportunity to evaluate these impacts. Five post-spill sampling sites were selected within the wetland from which a variety of abiotic and biotic samples were collected bi-monthly over a period of 12months. Abiotic variables included the sediment and water column oil concentrations, total nitrogen, total phosphorous, biochemical oxygen demand (BOD), silica, chlorophyll a, as well as in situ measurements of pH, electrical conductivity, and dissolved oxygen. Aquatic macroinvertebrates were chosen as biotic indicators in the study field due to their wide applicability as water quality indicators and were thus collected at each site. Spatial and temporal changes in total nitrogen, total phosphorous, and chlorophyll a concentrations as well as changes in pH were observed. The oil spillage also resulted in an increase in tolerant macroinvertebrate taxa, mainly Chironomidae and Psychodidae, at the sites closest to the source of the spillage. These two taxa, and to a lesser extent, Syrphidae, were identified as potentially useful indicators to determine the extent of vegetable oil contamination within a freshwater wetland. Furthermore, monitoring of these indicator taxa can be a useful management tool to determine the recovery of freshwater wetlands after vegetable oil spills. In the study, a static battery of bioassays of different biotic trophic levels was also employed to determine the adverse effects of the spilled vegetable oil on the biotic environment. It was evident from the result of the static battery of bioassay that adverse effects of the sunflower oil differ between trophic levels. The latter was in relationship with the data obtained from the field macroinvertebrate study, indicating that certain macroinvertebrate families were more tolerant to the adverse effects of sunflower oil than other families. Springer Science+Business Media Dordrecht, 2013 Freshwater wetland nationallicence Sunflower oil spill nationallicence Static battery of bioassays nationallicence Chironomidae nationallicence Psychodidae nationallicence Selala M. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria—Onderstepoort, Private Bag x04, Onderstepoort, 0110, Pretoria, South Africa aut Botha A-M Department of Genetics, University of Stellenbosch, Matieland, 7601, Stellenbosch, South Africa aut de Klerk A. CSIR Natural Resources and the Environment, P.O. Box 395, 0001, Pretoria, South Africa aut de Klerk L. CSIR Natural Resources and the Environment, P.O. Box 395, 0001, Pretoria, South Africa aut Myburgh J. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria—Onderstepoort, Private Bag x04, Onderstepoort, 0110, Pretoria, South Africa aut Blettler M. National Institute of Limnology (INALI; CONICET-UNL), Ciudad Universitaria 3000, Santa Fe, Argentina aut Oberholster P. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria—Onderstepoort, Private Bag x04, Onderstepoort, 0110, Pretoria, South Africa aut Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-15 0049-6979 224:9<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1650-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1650-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Selala M. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria—Onderstepoort, Private Bag x04, Onderstepoort, 0110, Pretoria, South Africa aut NATIONALLICENCE 700 1- Botha A-M Department of Genetics, University of Stellenbosch, Matieland, 7601, Stellenbosch, South Africa aut NATIONALLICENCE 700 1- de Klerk A. CSIR Natural Resources and the Environment, P.O. Box 395, 0001, Pretoria, South Africa aut NATIONALLICENCE 700 1- de Klerk L. CSIR Natural Resources and the Environment, P.O. Box 395, 0001, Pretoria, South Africa aut NATIONALLICENCE 700 1- Myburgh J. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria—Onderstepoort, Private Bag x04, Onderstepoort, 0110, Pretoria, South Africa aut NATIONALLICENCE 700 1- Blettler M. National Institute of Limnology (INALI; CONICET-UNL), Ciudad Universitaria 3000, Santa Fe, Argentina aut NATIONALLICENCE 700 1- Oberholster P. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria—Onderstepoort, Private Bag x04, Onderstepoort, 0110, Pretoria, South Africa aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-15 0049-6979 224:9<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer