Trout impact on distributional patterns of native fish species
Lerato Maimela at the uninvaded sites by the first waterfall in the Christmas pools of the Blyde River where the remnant population of the Treur River barb are abundant. (Photo by Lee-Anne Botha)

Trout impact on distributional patterns of native fish species

A recent fish survey by C∙I∙B members in the headwaters of the Blyde River, Mpumalanga Province, revealed that Rainbow trout (Oncorhynchus mykiss) invasions have reduced the abundance and divided the community structure of native fish species.

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Urban toads show themselves to be bolder – before and after invasion

Many of us are now familiar with urban commensal species - those that have adapted to life in towns and cities and can be seen to adapt their behaviour to exploit their new surroundings. Some of these urbanised species are then introduced to novel systems, and go on to become invasive.

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Impacts of invasive alien species in South Africa reviewed
The number of (A) invasive alien species across broad taxonomic and life-form groupings for which ecological impacts have been quantified in South Africa; and (B) the number of published studies on each group.

Impacts of invasive alien species in South Africa reviewed

A review of the peer-reviewed literature was undertaken at the Centre for Invasion Biology (C·I·B) to determine the level of understanding of the impacts of invasions of all taxonomic groups in all natural and semi-natural ecosystems in South Africa.

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Big trouble for little (crucian) carp
Dr Josie Pegg (South African Institute for Aquatic Biodiversity) with a South African common carp, Cyprinus carpio. (Photo credit: Josephine Pegg)

Big trouble for little (crucian) carp

Common carp (Cyprinus carpio) are highly successful invasive fish and are responsible for the decline of numerous native species. Reasons for their success has been poorly understood until now.

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Horticultural trade drives establishment success in alien ferns
Figure 2 The invasive Holly fern (Cyrtomium falcatum) colonising a wall in the town of Hermanus, South Africa.

Horticultural trade drives establishment success in alien ferns

The high demand for ornamental plants at a global scale, combined with modern and increasingly efficient modes of trade (i.e., e-commerce), highlights the horticultural trade industry as a subject of major conservation concern.

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