Fishermen turning a boat on Lake Victoria in Kenya. The lake is covered by the aquatic plant water hyacinth.
Yasuyoshi Chiba/AFP via Getty Images
The new report on alien invasive species doesn’t just concentrate on problems. It also offers solutions.
The brown mussel has retracted its range in South Africa due to decreasing seawater temperatures.
Olga Ernst/ Wikimedia Commons
A changing climate will make it difficult to anticipate and prevent invasions.
Fall armyworm devouring a soybean leaf.
Scott D. Stewart
This year’s unprecedented fall armyworm invasion has laid waste to lawns, athletic fields and crops. Is it a fluke? When will it end?
The diverse plant collections in botanical gardens increase the chance of pests and pathogens encountering suitable hosts and becoming invasive.
African clawed frog tadpoles in the laboratory.
Tadpoles at the edge of the population are no more vulnerable than those at the centre.
The invasive guttural toad.
A new study examines the diet of an invasive population of guttural toads in Mauritius and finds a number of species of conservation concern.
African clawed frogs are very easy to keep in the lab.They were readily adopted by scientists as a model research animal.
The African clawed frog is a notorious invader but it also takes some parasites with it to new regions.
Many frogs, such as the red-eyed tree frog, are sought-after pets.
Andy Morffew/Wikimedia Commons
People sometimes release pets into the wild, resulting in biological invasions.
The African clawed frog.
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.
The leaf-feeding beetle Zygogramma bicolorata is one of the most promising agents used against famine weed in South Africa.
Famine weed spreads rapidly and is devastatingly destructive. Biocontrol is one way of dealing with the problem.
Invasive pine trees in the Western Cape have affected lizards causing their numbers to drop significantly.
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.
Managing trout is a contentious issue with conflicting views about whether they pose a risk, or are beneficial.
Regulating species in South Africa is difficult. But identifying those creating the greatest tension, would shift focus on the most destructive species.
The American red swamp crayfish was intentionally introduced to parts of Africa to control snails and as a pet.
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.
The larger grain borer beetle attacks crops like maize and cassava, threatening food security.
Many alien plants and animals have been introduced to Africa from other regions and spread from country to country, often having devastating effects.