Marlene Wæge Stubberud

• Nater, Chloe Rebecca; Stubberud, Marlene Wæge; Langangen, Øystein Ole Gahr; Rustadbakken, Atle; Moe, S. Jannicke & Ergon, Torbjørn [Show all 8 contributors for this article] (2022). Towards a future without stocking: harvest and river regulation determine long-term population viability of migratory salmonids. Climate Research (CR). ISSN 0936-577X. 86, p. 37–52. doi: 10.3354/cr01644. Full text in Research Archive Show summary

  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

• Stubberud, Marlene Wæge; Nater, Chloe Rebecca; Vindenes, Yngvild; Vøllestad, Leif Asbjørn & Langangen, Øystein Ole Gahr (2021). Low impact of first-time spawners on population growth in a brown trout population. Climate Research (CR). ISSN 0936-577X. doi: 10.3354/cr01645.
• Stubberud, Marlene Wæge; Vindenes, Yngvild; Vøllestad, Asbjørn; Winfield, Ian J.; Stenseth, Nils Christian & Langangen, Øystein (2019). Effects of size‐ and sex‐selective harvesting: An integral projection model approach. Ecology and Evolution. ISSN 2045-7758. 9(22), p. 12556–12570. doi: 10.1002/ece3.5719. Full text in Research Archive
• Stubberud, Marlene Wæge; Myhre, Ane Marlene; Holand, Håkon; Kvalnes, Thomas; Ringsby, Thor Harald & Sæther, Bernt-Erik [Show all 7 contributors for this article] (2017). Sensitivity analysis of effective population size to demographic parameters in house sparrow populations. Molecular Ecology. ISSN 0962-1083. 26(9), p. 2449–2465. doi: 10.1111/mec.14057. Full text in Research Archive

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• Jensen, Henrik; Stubberud, Marlene Wæge; Baalsrud, Helle Tessand; Holand, Håkon; Kvalnes, Thomas & Hagen, Ingerid Julie [Show all 9 contributors for this article] (2018). Consequences of demographic processes for effective population size in house sparrows.
• Stubberud, Marlene Wæge (2017). The combined impact of harvesting and climate change in structured two-sex populations.
• Stubberud, Marlene Wæge (2017). Two-sex IPMs and harvesting - fish model.
• Jensen, Henrik; Stubberud, Marlene Wæge; Myhre, Ane Marlene; Baalsrud, Helle Tessand; Holand, Håkon & Kvalnes, Thomas [Show all 10 contributors for this article] (2017). Consequences of demographic processes for genetic drift in house sparrows.
• Jensen, Henrik; Stubberud, Marlene Wæge; Myhre, Ane Marlene; Baalsrud, Helle Tessand; Holand, Håkon & Kvalnes, Thomas [Show all 10 contributors for this article] (2017). Consequences of demographic processes for effective population size in house sparrows.
• Stubberud, Marlene Wæge (2016). The combined impact of harvesting and climate change in structured two-sex populations.
• Jensen, Henrik; Hagen, Ingerid Julie; Husby, Arild; Silva, Catarina; Kemppainen, Petri & Myhre, Ane Marlene [Show all 12 contributors for this article] (2016). Mapping of genes for fitness-related traits in house sparrows.
• Jensen, Henrik; Hagen, Ingerid Julie; Husby, Arild; Silva, Catarina; Kemppainen, Petri & Myhre, Ane Marlene [Show all 11 contributors for this article] (2016). Mapping of genes for fitness-related morphology in house sparrows.
• Jensen, Henrik; Myhre, Ane Marlene; Sæther, Bernt-Erik & Stubberud, Marlene Wæge (2015). Sensitivity analysis of effective population size to demographic parameters in house sparrow populations. NTNU.

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