Tadpoles at the edge of the population are no more vulnerable than those at the centre.
A new study examines the diet of an invasive population of guttural toads in Mauritius and finds a number of species of conservation concern.
The African clawed frog is a notorious invader but it also takes some parasites with it to new regions.
People sometimes release pets into the wild, resulting in biological invasions.
What was particularly interesting about the responses of the tadpoles was that they were similar even through they had very different evolutionary histories with the three species we chose.
Famine weed spreads rapidly and is devastatingly destructive. Biocontrol is one way of dealing with the problem.
Invasive plants have an impact on native species and unless these factors are properly understood, it is difficult to predict what sort of impact invasive plants will have.
Regulating species in South Africa is difficult. But identifying those creating the greatest tension, would shift focus on the most destructive species.
Developing countries have been slow to react to the alien species problem. Its impact can be massively reduced if policies are developed to deal with the issue.
Many alien plants and animals have been introduced to Africa from other regions and spread from country to country, often having devastating effects.