2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/27/2021 | 2:00 PM - 3:30 PM | ASSESSING THE IMPACT OF MULTIPLE NON-NATIVE SPECIES WITHIN AN INVADED AFRICAN RIVER SYSTEM | Virtual Platform
ASSESSING THE IMPACT OF MULTIPLE NON-NATIVE SPECIES WITHIN AN INVADED AFRICAN RIVER SYSTEM
The Great Fish River (GFR) is one of the anthropogenically modified river systems in South Africa and one characterised by multiple non-native fish species. We aimed to assess current state of invasions and mechanisms that facilitated the establishment of multiple non-native fishes within this system. We hypothesised that non-native fishes would reflect life history traits and environmental association attributes that are consistent with adaptability to disturbed and flow-modified habitat conditions. To date, a total of eleven non-native fish species have been recorded within the GFR. The inter-basin water transfer scheme (IBWT) and angling were responsible for majority of invasions, accounting for 36% and 45% respectively. Six introduced fishes have established, with three of these invading through the Orange-Fish IBWT. Four non-native fishes which were previously recorded during historical research, have failed to establish. Attributes such as large size, greater longevity and wide habitat tolerance appear to have facilitated establishments of most non-native species (Clarias gariepinus, Cyprinus carpio, Labeo capensis and Labeobarbus aeneus). In addition, proliferation of other species (Gambusia affinis and Tilapia sparrmanii) seems to be associated with habitat modification resulting from change in flow regime.
- Anthropogenic
- Stream
- Habitat
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Presenters/Authors
Pule Mpopetsi
(), Rhodes University, pulemp@gmail.com;
ASHA DISCLOSURE:
Financial -
Nonfinancial -