A recent study published in the Journal of Fish Biology showed that not only is introgressive hybridisation between two notorious freshwater fish invaders possible, but continues to occur within an invaded South African river system.
Genetic diversity has long been considered a cornerstone of biological invasions. It is generally assumed that populations of an invasive alien species will have lower genetic diversity in the new invaded area when compared to populations in the native range.
A recent review paper on the African sharptooth catfish (Clarias gariepinus) has highlighted the urgent need for impact studies.
Normally, frogs eat small invertebrates that easily fit into their mouths, but studies of stomach contents have shown that they sometimes eat eggs, tadpoles and even adults of other frogs. What are the conditions under which frogs eat frogs?
Prevention of the introduction of new invasive species to a country is considered to be an effective measure against biological invasions. The growth of online sellers, however, makes the regulation of plant introductions much more challenging - a new plant is only a few clicks away and can be bought very easily.