Opinion Paper

South African ecotoxicology — present status and future prognosis

  • V Wepener
  • PM Chapman

Abstract

Toxicology studies the interactions of a chemical substance with individual organisms, whereas ecotoxicology is a multidisciplinary approach incorporating ecology and other disciplines, e.g. chemistry, microbiology, etc., to determine responses of individuals, populations and whole ecosystems to stressors such as chemicals. We present here the current status of toxicity testing in South Africa and propose a future prognosis for such tests. We propose a path forward for the development of ecotoxicology in South Africa and also globally. Toxicity testing issues dealt with are the use of surrogate species as opposed to indigenous species, their comparative tolerances, and the selection of relevant endpoints as measures of toxicity. Ecotoxicological considerations need to address the following key ecological realities: tolerance (both physiological acclimation and genetic adaptation), trophic redundancies, resilience, compensation (e.g. density dependence), evolution, and recovery. We believe that predictive ecotoxicology will play a major role in the future management of ecosystems that are constantly changing. We also believe that such management must be proactive to the point of intervention to create desired change, specifically the maintenance of ecosystem services.

Keywords: changing environments, ecosystem services, relevant endpoints, toxicology

African Journal of Aquatic Science 2012, 37(3): 229–234

Author Biographies

V Wepener
Water Research Group, School of Environmental Sciences and Development, Private Bag X6001, North-West University, Potchefstroom 2520, South Africa; Centre for Aquatic Research, Department of Zoology, University of Johannesburg, Auckland Park, PO Box 524, Johannesburg 2006, South Africa
PM Chapman
Golder Associates Ltd, 500-4260 Still Creek Drive, Burnaby, BC, V5C 6C6, Canada
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914