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dc.contributor.authorBellingan, T.A.
dc.contributor.authorWoodford, D.J.
dc.contributor.authorGouws, J.
dc.contributor.authorVillet, M.H.
dc.contributor.authorWeyl, O.L.F.
dc.date.accessioned2015-08-26T07:54:59Z
dc.date.available2015-08-26T07:54:59Z
dc.date.issued2015
dc.identifier.citationBellingan, T.A.; Woodford, D.J.; Gouws, J.; Villet, M.H.; Weyl, O.L.F. (2015) Rapid bioassessment of the effects of repeated rotenone treatments on invertebrate assemblages in the Rondegat River, South Africa. African Journal of Aquatic Science 40(1): 89-94en
dc.identifier.issn1608-5914
dc.identifier.urihttp://hdl.handle.net/123456789/1745
dc.description.abstractThe potential collateral effects of eradicating invasive fishes in streams necessitate the monitoring of invertebrate communities during treatment. In an environmental rehabilitation programme, non-native smallmouth bass were removed from the lower reaches of the Rondegat River, Western Cape, South Africa, in 2012 and again in 2013 using the piscicide rotenone. A monitoring programme tracked the ecological response of organisms to these activities using quantitative sampling of macroinvertebrates on stones and the ISO-certified SASS5 rapid bioassessment method for assessing macroinvertebrate community integrity. We recorded a significant decrease in macroinvertebrate densities from the stones-in-current biotope following both rotenone treatments. The average score per taxon (ASPT) declined after the first treatment, indicating a loss of taxa sensitive to diminished water quality, then recovered prior to the second treatment, and subsequently no decline was detected after the lower dose used in the 2013 treatment. The SASS values were too variable to reveal trends. The ASPTs indicated that the community may have been resistant to low dose and resilient to high dose, due to inter-treatment recovery following the 2012 treatment, suggesting that the invertebrate assemblage is resilient to the conservative use of rotenone for localised river rehabilitation when upstream sources of recruitment exist.en
dc.format.extent288474 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherNISC (Pty) Ltd and Taylor & Francisen
dc.subjectfreshwateren
dc.subjectinvasionen
dc.subjectmacroinvertebratesen
dc.subjectpiscicideen
dc.subjectrehabilitationen
dc.subjectSASS5en
dc.titleRapid bioassessment of the effects of repeated rotenone treatments on invertebrate assemblages in the Rondegat River, South Africaen
dc.typeArticleen


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