Abteilung Fischökologie & Evolution

Fischökologie & Evolution (FishEc)

Wir arbeiten an Ökologie, Evolution und Biodiversität von aquatischen Organismen, mit Schwerpunkt auf Fischen. Wir erforschen die Mechanismen der Entstehung, der Persistenz und des Verlustes von Biodiversität.

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News

Interspecific hybrids (Anna Feller)

24. Juni 2020

Rapid generation of ecologically relevant behavioral novelty in experimental cichlid hybrids

Interspecific hybrids can have transgressive phenotypes that may allow them to explore novel ecological niches. Using a combination of behavioral assays, morphometric analyses, and genetic mapping, we demonstrate transgressive segregation in morphology and in a novel trophic behavior in F2 hybrids between two generalist cichlid species from Lake Malawi. Such rapid generation of novel ecologically relevant phenotypes might contribute to the rapid generation of ecological diversity in cichlid fish adaptive radiations. Weiterlesen

28. Mai 2020

Genetik des Hochzeitskleids bestimmt, ob Arten koexistieren können

Im Victoriasee leben rund 500 verschiedene Arten von Buntbarschen. Welche davon am selben Ort koexistieren können, hängt davon ab, wie gross der Effekt einzelner Gene auf wichtige Merkmale bei der Partnerwahl ist. Das fand ein Forscherteam der Eawag und der Universität Bern heraus. Weiterlesen

25.  Mai 2020

Die nächste Pandemie ist absehbar – Es ist Zeit, die ökologische Krise ernst zu nehmen

126 Schweizer Forschende, darunter 6 von der Eawag, wollen ihre Landsleute in der Schweiz auf einige wissenschaftliche Fakten aufmerksam machen, die Covid-19 mit der natürlichen Umwelt verbinden. Weiterlesen

15. Mai 2020

On biological evolution and environmental solutions

Drawing insights from multiple disciplines is essential for finding integrative solutions that are required to tackle complex environmental problems. Human activities are causing unprecedented influence on global ecosystems, culminating in the loss of species and fundamental changes in the selective environments of organisms across the tree of life. Our collective understanding about biological evolution can help identify and mitigate many of the environmental problems in the Anthropocene. To this end, we propose a stronger integration of environmental sciences with evolutionary biology. Originalpublikation

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Neueste Publikation

Phosphorus limitation does not drive loss of bony lateral plates in freshwater stickleback (Gasterosteus aculeatus)

Connecting the selective forces that drive the evolution of phenotypes to their underlying genotypes is key to understanding adaptation, but such connections are rarely tested experimentally. Threespine stickleback (Gasterosteus aculeatus) are a powerful model for such tests because genotypes that underlie putatively adaptive traits have been identified. For example, a regulatory mutation in the Ectodysplasin (Eda) gene causes a reduction in the number of bony armor plates, which occurs rapidly and repeatedly when marine sticklebacks invade freshwater. However, the source of selection on plate loss in freshwater is unknown. Here, we tested whether dietary reduction of phosphorus can account for selection on plate loss due to a growth advantage of low‐plated fish in freshwater. We crossed marine fish heterozygous for the 16 kilobase freshwater Eda haplotype and compared the growth of offspring with different genotypes under contrasting levels of dietary phosphorus in both saltwater and freshwater. Eda genotype was not associated with growth differences in any treatment, or with mechanisms that could mitigate the impacts of phosphorus limitation, such as differential phosphorus deposition, phosphorus excretion, or intestine length. This study highlights the importance of experimentally testing the putative selective forces acting on phenotypes and their underlying genotypes in the wild.
Archambeault, S. L.; Durston, D. J.; Wan, A.; El‐Sabaawi, R. W.; Matthews, B.; Peichel, C. L. (2020) Phosphorus limitation does not drive loss of bony lateral plates in freshwater stickleback (Gasterosteus aculeatus), Evolution, International Journal of Organic Evolution, doi:10.1111/evo.14044, Institutional Repository

FishEc Seminare

23. - 24.09.​2020,
Online
Online - Tag and Track: Den Fischen auf der Spur

Semesterpause bis 14. September 2020

Forschungsprojekte

We investigate the mechanisms of speciation and adaptive radiation

Speciation and adaptive radiation
Genome evolution and genomic divergence across the Swiss Alpine whitefish radiation

Speciation Genomics of Alpine Whitefish
Investigating the interactions between migration ecology, local adaptation and diversification

Trout Migration

Projet Lac Synthesis Bericht

Weitere Forschungsprojekte