The relationship between fish and bivalve molluscs is an excellent model system for studying survival and the risk of coexistence in a rapidly changing environment

The project dealt with various aspects of inter-population variability in the success rate of biological invasions and their impact on native species. Experimental and field studies in the areas of invasion and original occurrence were combined. Population genetic studies of both native and invasive species were also an important part of the project. The project was covered by the topic of the relationship between bitterling and host bivalve molluscs.

The most important discovery was the confirmation of the fundamental impact of inter-popular differences in the success of invasions, their impact, but also in the degree of vulnerability of native organisms. This finding may help to explain the known fact that some species may enter non-indigenous areas in the long term without any visible impact on native organisms. Suddenly, however, there is a dramatic change, after which this non-native species has significant negative impacts.

doc. RNDr. Martin Reichard, Ph.D.
Institute of Vertebrate Biology of the Czech Academy of Sciences