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Population structure, inbreeding and local adaptation within an endangered riverine specialist: the nase (Chondrostoma nasus)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Division of Aquatic Ecology, Institute of Ecology & Evolution, University of Bern, Bern, Switzerland and Department of Fish Ecology and Evolution, EAWAG Center for Ecology, Evolution and Biogeochemistry, Kastanienbaum, Switzerland .ORCID iD: 0000-0001-6436-2025
2014 (English)In: Conservation Genetics, ISSN 1566-0621, E-ISSN 1572-9737, Vol. 15, no 4, 933-951 p.Article in journal (Refereed) Published
Abstract [en]

Chondrostoma nasus is a cyprinid fish with highly specialized, ecologically and geographically distinct, ontogenetic trophic niches. Nase population numbers across their Swiss range have shown massive declines and many localized extinctions. In this study, we integrate genetic data (AFLP, microsatellite, mtDNA sequence) with phenotypic and demographic analyses to survey patterns of neutral and adaptive genetic diversity in all extant (and one extinct) Swiss nase populations, with the aim to delineate intraspecific conservation units (CUs) and to inform future population management strategies. We discovered two major genetically and geographically distinct population groupings. The first population grouping comprises nase inhabiting rivers flowing into Lake Constance; the second comprises nase populations from Rhine drainages below Lake Constance. Within these clusters there is generally limited genetic differentiation among populations. Genomic outlier scans based on 256 to 377 polymorphic AFLP loci revealed little evidence of local adaptation both within and among population clusters, with the exception of one candidate locus identified in scans involving the low genetic diversity Schanzengraben population. However, significant phenotypic differentiation in body shape between certain populations suggests a need for more intensive future studies of local adaptation. Our data strongly suggests that the two major population groups should be treated as distinct CUs, with any supplemental stocking and reintroductions sourced only from within the range of the CU concerned.

Place, publisher, year, edition, pages
Springer Science+Business Media B.V., 2014. Vol. 15, no 4, 933-951 p.
Keyword [en]
Chondrostoma nasus, Conservation genomics, Local adaptation, Population genomics, Outlier scans, Adaptive potential, Conservation units (CUs)
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URN: urn:nbn:se:umu:diva-92931DOI: 10.1007/s10592-014-0590-3ISI: 000339732800015OAI: diva2:747863
Available from: 2014-09-17 Created: 2014-09-09 Last updated: 2014-09-17Bibliographically approved

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Hudson, Alan G.
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