NWFSC Monster Seminar Jam: Asbjørn Vøllestad
The NWFSC's science seminar series features weekly presentations from our scientists and colleagues.
Asbjørn Vøllestad (University of Oslo) is presenting a talk, "Understanding local adaptation in a salmonid fish: the European grayling, Thymallus thymallus"
Post-glacial landscapes have evolved over time following deglaciation. This has particular effects on freshwater systems, due to a diversity of geological and hydrological processes. Freshwater organisms have dispersed into Norway from various glacial refugia, a process that is still in progress. On top of natural processes, human activity has led to major changes in distribution, mainly through translocations and remodeling of waterways.
Here, I describe the distribution and biology of European grayling Thymallus thymallus in a large Norwegian river system. The main focus will be on the more recent changes to the waterways, and how it has led to habitat fragmentation, but also opened the opportunity to establish new locally-adapted populations. We have studied newly established populations using a variety of approaches; population and quantitative genetics, transcriptomics, proteomics and hopefully genomics. Overall, results from the various studies show that the populations respond evolutionary to local-scale environmental differences (mainly water temperature during early development). Further, plastic responses seem to be important in the early phase of population diversification. Population genomic studies are now becoming possible following the completion of an annotated genome of high quality. Such resources may help in addressing questions about the genetic architecture of traits important for local adaptation. However, we are not there yet.
Dr. Vøllestad received his Bachelors (1980), Masters (1982), and PhD (1988) degrees from the University of Oslo, and he’s been a professor there since 1991. He has published over 200 papers and book chapters, mostly concerning evolutionary ecology of various fish species. Since 2005, he has been the editor of Ecology of Freshwater Fish.
C Evangelista, J Dupeu, J Sandkjenn, Diaz Pauli, B, A Herland, J Meriguet, L A Vøllestad, E Edeline (2021) Ecological ramifications of adaptation to size-selective mortality Royal Society Open Science 8: 210842.
R A Pettersen, C Junge, K Østbye, T A Mo, L A Vøllestad (2021) Genetic population structure of the monogenean parasite Gyrodactylus thymalli and its host European grayling (Thymallus thymallus) in a large Norwegian lake. Hydrobiologia 848: 547-561.
T Sävilammi, S Papakostas, E H Leder, L A Vøllestad, P V Debes, C R Primmer (2021) Cytosine methylation patterns suggest a role of methylation in plastic and adaptive responses to temperature in European grayling (Thymallus thymallus) populations Epigenetics 16: 547-561.
J H L'Abée-Lund, L A Vøllestad, J E Brittain, Å S Kvambekk, T Solvang (2021) Geographic variation and temporal trends in ice phenology in Norwegian lakes during the period 1890–2020 The Cryosphere 15: 2333–2356.
L A Vøllestad, C R Primmer (2019) Understanding local adaptation in a freshwater salmonid fish: evolution of a research program. ICES Journal of Marine Science 76: 1404-1414.
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