We study ecology, evolution and biodiversity of fishes and other aquatic organisms. We are interested in the mechanisms that drive the origins, the maintenance and the loss of species, genetic and functional diversity.
Size-dependent tradeoffs in seasonal freshwater environments facilitate differential salmonid migration
Seasonal spatio-temporal variation in habitat quality and abiotic conditions leads to animals migrating between different environments around the world. Whereas mean population timing of migration is often fairly well understood, explanations for variation in migratory timing within populations are often lacking. Condition-dependent tradeoffs may be an understudied mechanism that can explain this differential migration. While fixed condition-specific thresholds have been identified in earlier work on ontogenetic niche shifts, they are rare in differential migration, suggesting that thresholds in such systems can shift based on temporally variable environmental conditions.
Hybrids increase fish biodiversity in lakes of East Africa
The lakes of East Africa are home to a surprising number of different cichlid species. This level of biodiversity has developed partly due to hybrids that managed to take over new ecological niches in their habitats, according to recent research carried out by scientists at the Swiss Federal Institute of Aquatic Science and Technology, Eawag, and the University of Bern. Read more
November 13, 2019
Opportunity makes species
There may be hundreds of species of char living in Greenland’s lakes and rivers, according to a team from the Swiss Federal Institute of Aquatic Science and Technology (Eawag) and the University of Bern, that has discovered the largest known diversity of char species in the catchment area of the Eqaluit River. Read more