Fennoscandian freshwater fishes

Jönsson, Bror; Jönsson, Nina

doi:10.1002/9781118394380.ch8

Cited by 3 publications

(2 citation statements)

References 73 publications

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“…Similarly, the introduction of non-native species is problematic as local adaptation patterns might be disrupted (Bourret, O'Reilly, Carr, Berg, & Bernatchez, 2011;Hutchings, 2014;Jonsson & Jonsson, 2016). Consequently, supplementary stocking with regional specimens has become a widely applied alternative aiming to both maintain natural genetic diversity and integrity and counteract negative effects stemming from overexploitation, pollution, and artificial migration barriers (Saint-Pé et al, 2018;Vøllestad & Hesthagen, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…In some cases, stocking has reduced genetic differentiation across wild populations (Eldridge et al, 2009;Eldridge & Naish, 2007;Hansen et al, 2009;Kohout, Jašková, Papoušek, Šedivá, & Šlechta, 2012;Marie, Bernatchez, & Garant, 2010) and altered dispersal behavior of admixed offspring (Saint-Pé et al, 2018). These findings have raised concerns about the loss of local adaptation (Bourret et al, 2011;Hutchings, 2014;Jonsson & Jonsson, 2016) and changes in ecologically important traits through hybridization between wild and captivity-bred fish (Saint-Pé et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system

Klütsch

Maduna

Polikarpova

et al. 2019

Ecology and Evolution

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Habitat discontinuity, anthropogenic disturbance, and overharvesting have led to population fragmentation and decline worldwide. Preservation of remaining natural genetic diversity is crucial to avoid continued genetic erosion. Brown trout (Salmo trutta L.) is an ideal model species for studying anthropogenic influences on genetic integrity, as it has experienced significant genetic alterations throughout its natural distribution range due to habitat fragmentation, overexploitation, translocations, and stocking. The Pasvik River is a subarctic riverine system shared between Norway, Russia, and Finland, subdivided by seven hydroelectric power dams that destroyed about 70% of natural spawning and nursing areas. Stocking is applied in certain river parts to support the natural brown trout population. Adjacent river segments with different management strategies (stocked vs. not stocked) facilitated the simultaneous assessment of genetic impacts of dams and stocking based on analyses of 16 short tandem repeat loci. Dams were expected to increase genetic differentiation between and reduce genetic diversity within river sections. Contrastingly, stocking was predicted to promote genetic homogenization and diversity, but also potentially lead to loss of private alleles and to genetic erosion. Our results showed comparatively low heterozygosity and clear genetic differentiation between adjacent sections in nonstocked river parts, indicating that dams prevent migration and contribute to genetic isolation and loss of genetic diversity. Furthermore, genetic differentiation was low and heterozygosity relatively high across stocked sections. However, in stocked river sections, we found signatures of recent bottlenecks and reductions in private alleles, indicating that only a subset of individuals contributes to reproduction, potentially leading to divergence away from the natural genetic state. Taken together, these results indicate that stocking counteracts the negative fragmentation effects of dams, but also that stocking practices should be planned carefully in order to ensure long‐term preservation of natural genetic diversity and integrity in brown trout and other species in regulated river systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system

Klütsch

Maduna

Polikarpova

et al. 2019

Ecology and Evolution

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Aboriginal freshwater fisheries as resilient social–ecological systems

Lam

2015

Freshwater Fisheries Ecology

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Freshwater as a Sustainable Resource and Generator of Secondary Resources in the 21st Century: Stressors, Threats, Risks, Management and Protection Strategies, and Conservation Approaches

Bănăduc

Simić

Cianfaglione

et al. 2022

IJERPH

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This paper is a synthetic overview of some of the threats, risks, and integrated water management elements in freshwater ecosystems. The paper provides some discussion of human needs and water conservation issues related to freshwater systems: (1) introduction and background; (2) water basics and natural cycles; (3) freshwater roles in human cultures and civilizations; (4) water as a biosphere cornerstone; (5) climate as a hydrospheric ‘game changer’ from the perspective of freshwater; (6) human-induced stressors’ effects on freshwater ecosystem changes (pollution, habitat fragmentation, etc.); (7) freshwater ecosystems’ biological resources in the context of unsustainable exploitation/overexploitation; (8) invasive species, parasites, and diseases in freshwater systems; (9) freshwater ecosystems’ vegetation; (10) the relationship between human warfare and water. All of these issues and more create an extremely complex matrix of stressors that plays a driving role in changing freshwater ecosystems both qualitatively and quantitatively, as well as their capacity to offer sustainable products and services to human societies. Only internationally integrated policies, strategies, assessment, monitoring, management, protection, and conservation initiatives can diminish and hopefully stop the long-term deterioration of Earth’s freshwater resources and their associated secondary resources.

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Fennoscandian freshwater fishes

Cited by 3 publications

References 73 publications

Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system

Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system

Aboriginal freshwater fisheries as resilient social–ecological systems

Freshwater as a Sustainable Resource and Generator of Secondary Resources in the 21st Century: Stressors, Threats, Risks, Management and Protection Strategies, and Conservation Approaches

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