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Variation in salinity tolerance between and within anadromous subpopulations of pike (Esox lucius)
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Evolutionary ecology;Ctr Ecol & Evolut Microbial Model Syst EEMiS)
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Swedish University of Agricultural Sciences.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Evolutionary Ecology;Ctr Ecol & Evolut Microbial Model Syst EEMiS)
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Fish Ecology;Ctr Ecol & Evolut Microbial Model Syst EEMiS)ORCID iD: 0000-0003-0344-1939
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 22Article in journal (Refereed) Published
Abstract [en]

Environmental heterogeneity is a key determinant of genetic and phenotypic diversity. Stable andhomogenous environments tends to result in evolution of specialism and local adaptations, whiletemporally unpredictable environments may maintain a diversity of specialists, promote generaliststrategies, or favour diversified bet hedging strategies. We compared salinity tolerance between twoanadromous subpopulations of pike (Esox Lucius) that utilize freshwater spawning sites with differentsalinity regimes. Eggs from each population were artificially fertilized and incubated in a salinitygradient (0, 3, 5, 7, and 9 psu) using a split-brood design. Effects on embryonic development, hatchingsuccess, survival of larvae, and fry body length were compared between populations and families.The population naturally spawning in the stable freshwater habitat showed signs of specialization forfreshwater spawning. The population exposed to fluctuating selective pressure in a spawning area withoccasional brackish water intrusions tolerated higher salinities and displayed considerable variation inreaction norms. Genetic differences and plasticity of salinity tolerance may enable populations to copewith changes in salinity regimes associated with future climate change. That geographically adjacentsubpopulations can constitute separate units with different genetic characteristics must be consideredin management and conservation efforts to avoid potentially negative effects of genetic admixture onpopulation fitness and persistence.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018. Vol. 8, article id 22
National Category
Ecology
Research subject
Natural Science, Ecology
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URN: urn:nbn:se:lnu:diva-69620DOI: 10.1038/s41598-017-18413-8ISI: 000419441300022PubMedID: 29311634OAI: oai:DiVA.org:lnu-69620DiVA, id: diva2:1171726
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-10-24Bibliographically approved

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Sunde, JohannaTamario, CarlTibblin, PetterLarsson, PerForsman, Anders

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