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Distribution and establishment of the alien Australian redclaw crayfish, Cherax quadricarinatus, in South Africa and Swaziland
It is demonstrated that C. quadricarinatus is established in South Africa and Swaziland and that the species has spread, not only within the river where it was first introduced, but also between rivers. Expand
Optimising invasive fish management in the context of invasive species legislation in South Africa
Background : South Africa hosts a large number of non-native freshwater fishes that were introduced for various industries. Many of these species are now listed under the National EnvironmentalExpand
Freshwater crayfish invasions in South Africa: past, present and potential future
Freshwater crayfish invasions have been studied around the world, but less so in Africa, a continent devoid of native freshwater crayfish. The present study reviews historical and current informationExpand
Managing conflict-generating invasive species in South Africa: Challenges and trade-offs
Background: This paper reviewed the benefits and negative impacts of alien species that are currently listed in the Alien and Invasive Species Regulations of the National Environmental Management:Expand
Trophic interrelationships amongst cichlid fishes in a tropical African reservoir (Lake Chivero, Zimbabwe)
The diet of seven cichlid species of Lake Chivero, Zimbabwe, was investigated from October 2004 to April 2005 to determine the degree of dietary overlap and interspecific competition, which indicated changes in the lake, which is eutrophic and has experienced severe algal blooms since 1960. Expand
The status of biological invasions and their management in South Africa
Additional contributing authors: Lee-Anne Botha, Oupa Chauke, Jennifer Fill, 8 Therese Forsyth Llewellyn Foxcroft, Charles Griffiths, Michelle Greve, Dai 9 Herbert, Pat Holmes, Philip Ivey, StiaanExpand
Trophic interrelationships between the exotic Nile tilapia, Oreochromis niloticus and indigenous tilapiine cichlids in a subtropical African river system (Limpopo River, South Africa)
Stable isotope analysis revealed that the two Oreochromis species had different stable isotope ratios derived from different food sources, revealing fine-scale patterns of food resource partitioning that could be achieved through selective feeding. Expand
Evaluating invasion risk for freshwater fishes in South Africa
FISK was demonstrated to be a useful risk assessment tool to evaluate the invasion risk posed by species proposed for use in aquaculture and was identified as the threshold to delineate between species that could become invasive in South Africa and those that are unlikely to become invasive. Expand
Ecological niche modeling of the invasive potential of Nile tilapia Oreochromis niloticus in African river systems: concerns and implications for the conservation of indigenous congenerics
The evaluated differences in the predictive power of models trained with different environmental variables, the effect of species range (native vs. introduced) on model performance and assessed whether or not there is evidence suggestive of a niche shift in Nile tilapia following its introduction indicated that the environmental conditions available to Nile Tilapia in its native and introduced ranges are not congruent. Expand