Whole genome resequencing identifies local adaptation associated with environmental variation for redband trout.

Autor:	Andrews KR; Institute for Interdisciplinary Data Sciences (IIDS), University of Idaho, Moscow, Idaho, USA., Seaborn T; Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, Moscow, Idaho, USA., Egan JP; Department of Biological Sciences, College of Science, University of Idaho, Moscow, Idaho, USA.; Bell Museum of Natural History, University of Minnesota, Saint Paul, Minnesota, USA., Fagnan MW; Institute for Interdisciplinary Data Sciences (IIDS), University of Idaho, Moscow, Idaho, USA., New DD; Institute for Interdisciplinary Data Sciences (IIDS), University of Idaho, Moscow, Idaho, USA., Chen Z; Aquaculture Research Institute, University of Idaho, Hagerman, Idaho, USA., Hohenlohe PA; Department of Biological Sciences, College of Science, University of Idaho, Moscow, Idaho, USA., Waits LP; Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, Moscow, Idaho, USA., Caudill CC; Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, Moscow, Idaho, USA., Narum SR; Aquaculture Research Institute, University of Idaho, Hagerman, Idaho, USA.; Columbia River Inter-Tribal Fish Commission, Hagerman, Idaho, USA.
Jazyk:	angličtina
Zdroj:	Molecular ecology [Mol Ecol] 2023 Feb; Vol. 32 (4), pp. 800-818. Date of Electronic Publication: 2022 Dec 19.
DOI:	10.1111/mec.16810
Abstrakt:	Aquatic ectotherms are predicted to harbour genomic signals of local adaptation resulting from selective pressures driven by the strong influence of climate conditions on body temperature. We investigated local adaptation in redband trout (Oncorhynchus mykiss gairdneri) using genome scans for 547 samples from 11 populations across a wide range of habitats and thermal gradients in the interior Columbia River. We estimated allele frequencies for millions of single nucleotide polymorphism loci (SNPs) across populations using low-coverage whole genome resequencing, and used population structure outlier analyses to identify genomic regions under divergent selection between populations. Twelve genomic regions showed signatures of local adaptation, including two regions associated with genes known to influence migration and developmental timing in salmonids (GREB1L, ROCK1, SIX6). Genotype-environment association analyses indicated that diurnal temperature variation was a strong driver of local adaptation, with signatures of selection driven primarily by divergence of two populations in the northern extreme of the subspecies range. We also found evidence for adaptive differences between high-elevation desert vs. montane habitats at a smaller geographical scale. Finally, we estimated vulnerability of redband trout to future climate change using ecological niche modelling and genetic offset analyses under two climate change scenarios. These analyses predicted substantial habitat loss and strong genetic shifts necessary for adaptation to future habitats, with the greatest vulnerability predicted for high-elevation desert populations. Our results provide new insight into the complexity of local adaptation in salmonids, and important predictions regarding future responses of redband trout to climate change. (© 2022 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.)
Databáze:	MEDLINE
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