Cristin-resultat-ID: 1958435
Sist endret: 17. januar 2022, 12:34
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Towards a future without stocking: harvest and river regulation determine long-term population viability of migratory salmonids

Bidragsytere:
  • Chloe Rebecca Nater
  • Marlene Wæge Stubberud
  • Øystein Ole Gahr Langangen
  • Atle Rustadbakken
  • S. Jannicke Moe
  • Torbjørn Ergon
  • mfl.

Tidsskrift

Climate Research (CR)
ISSN 0936-577X
e-ISSN 1616-1572
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Volum: 86
Sider: 37 - 52
Open Access

Importkilder

Scopus-ID: 2-s2.0-85125703607

Klassifisering

Vitenskapsdisipliner

Matematikk og naturvitenskap

Beskrivelse Beskrivelse

Tittel

Towards a future without stocking: harvest and river regulation determine long-term population viability of migratory salmonids

Sammendrag

Freshwater species are particularly vulnerable to emerging threats linked to climate change because they are often already heavily impacted by habitat destruction, pollution, and exploitation. For many harvested populations of freshwater fish, these combined impacts have been mitigated for decades through stocking with captive-bred individuals. However, stocking may lead to loss of genetic variation, which may be crucial for adaptation under climate change. Exploration of sustainable alternatives is therefore paramount. We used a female-based integral projection model (IPM) to assess the consequences of terminating a long-term stocking programme for a population of landlocked, migratory brown trout Salmo trutta, and to evaluate relative effectiveness of alternative management strategies involving harvest regulations and river habitat improvement. The IPM classified individuals by body size, life history stage, and location relative to a hydropower dam, and was parameterised with 50 yr of individual-based data, supplemented with literature values. Model simulations indicated a strong population decline of 22-29% per year without stocking, much of which was attributed to high harvest mortality. Consequently, drastic reductions in fishing pressure were predicted to be necessary to ensure population viability without stocking. Mitigation measures reducing mortality associated with the hydropower dam or restoring spawning areas could further contribute to population viability when combined with changes in harvest regulations. Our results thus emphasise that large changes in management strategies, such as termination of long-term stocking programmes, require a thorough assessment of potential consequences and alternative mitigation strategies using data and models, or, at the very least, a precautionary approach under consideration of on-going climate change. Migratory salmonid · Salmo trutta · Integral projection model · Harvest · Fishing · Stocking · Dam · Hydropower · Trout

Bidragsytere

Chloé Rebecca Nater

Bidragsyterens navn vises på dette resultatet som Chloe Rebecca Nater
  • Tilknyttet:
    Forfatter
    ved Centre for Ecological and Evolutionary Synthesis ved Universitetet i Oslo
  • Tilknyttet:
    Forfatter
    ved Institutt for biologi ved Norges teknisk-naturvitenskapelige universitet

Marlene Wæge Stubberud

  • Tilknyttet:
    Forfatter
    ved Centre for Ecological and Evolutionary Synthesis ved Universitetet i Oslo
Aktiv cristin-person

Øystein Ole Gahr Langangen

  • Tilknyttet:
    Forfatter
    ved Seksjon for akvatisk biologi og toksikologi ved Universitetet i Oslo

Atle Rustadbakken

  • Tilknyttet:
    Forfatter
    ved Norconsult AS

Jannicke Moe

Bidragsyterens navn vises på dette resultatet som S. Jannicke Moe
  • Tilknyttet:
    Forfatter
    ved Økotoksikologi ved Norsk institutt for vannforskning
1 - 5 av 8 | Neste | Siste »