Oscar Nordahl
Researcher
Department of Biology and Environmental Science
Faculty of Health and Life Sciences
My names is Oscar Nordahl and I am enrolled as a PhD-student in Ecology at the Linnaeus University Centre for Ecology and Evolution in Microbial model Systems (EEMiS). I utilize the coastal fish community in the Baltic Sea as model system to study barriers to gene flow and local adaptations on a fine spatial scale. This is achieved by the use of a wide array of techniques: molecular tools to study genetic barriers; field and laboratory experiments to study local adaptations; field studies to detect phenotypic variation among populations.
My research groups
-
Fish Ecology Research Group (FERG) Baltic coastal populations of predatory fish, mainly perch and pike, has been greatly reduced in recent decades. Underlying causes can be altered food webs,…
-
Linnaeus University Centre for Ecology and Evolution in Microbial model Systems (EEMiS) EEMiS is a centre for research excellence studying ecological and evolutionary interactions from land to sea.
My ongoing research projects
-
Project: Catch-and-release fishing - an invisible threat to aquatic ecosystems? Our aim for this project is to provide novel insights regarding long-term effects of catch-and-release fishing on…
-
Project: Decoding spatiotemporal predator impact The growing populations of seals and cormorants in the Baltic Sea are believed to contribute to the decline of coastal fish, increasing the pressure to…
-
Project: Kalmar Baltic Tracking Network: Spatial ecology of the coastal fish community In this project we will study the movement ecology and habitat choice of the coastal Baltic Sea fish community…
-
Project: MULTIP – Multifunctional irrigation ponds MULTIP investigates whether irrigation ponds built to benefit agricultural productivity also promote biodiversity.
Publications
Article in journal (Refereed)
-
Hauber, M.M., Todisco, V., Nordahl, O., Tibblin, P., Fridolfsson, E., et al. (2026). Thiamine Allocation and Deficiency Status Throughout the Life Cycle of Cod. Ecology and Evolution. 16 (1).
Status: Published -
Zöttl, M., Cuccuru, J., Berge, A., Bergström, K., Flink, H., et al. (2025). Turbidity reduces territory defence and exploration in an East African cichlid, Neolamprologus pulcher. Animal Behaviour. 226.
Status: Published -
Berggren, H., Yildirim, Y., Nordahl, O., Larsson, P., Dopson, M., et al. (2024). Ecological filtering drives rapid spatiotemporal dynamics in fish skin microbiomes. Molecular Ecology. 33 (18).
Status: Published -
Bergström, K., Berggren, H., Nordahl, O., Koch-Schmidt, P., Tibblin, P., et al. (2024). Seasonal and Daily Movement Patterns by Wels Catfish (Silurus glanis) at the Northern Fringe of Its Distribution Range. Fishes. 9 (7).
Status: Published -
Hall, M., Nordahl, O., Forsman, A., Tibblin, P. (2023). Maternal size in perch (Perca fluviatilis) influences the capacity of offspring to cope with different temperatures. Frontiers in Marine Science. 10.
Status: Published -
Castagne, P., Paz-Vinas, I., Bouletreau, S., Ferriol, J., Loot, G., et al. (2023). Patterns of genetic variation in native and non-native populations of European catfish Silurus glanis across Europe. Biodiversity and Conservation. 32. 2127-2147.
Status: Published -
Münnich, J., Hoppmann, F., Berggren, H., Nordahl, O., Tibblin, P. (2023). The role of chemical communication in the predator-prey role reversal of northern pike (Esox lucius) and three-spined stickleback (Gasterosteus aculeatus). Fisheries Research. 258.
Status: Published -
Flink, H., Tibblin, P., Hall, M., Hellström, G., Nordahl, O. (2023). Variation among bays in spatiotemporal aggregation of Baltic Sea pike highlights management complexity. Fisheries Research. 259.
Status: Published -
Tibblin, P., Bergström, K., Flink, H., Hall, M., Berggren, H., et al. (2023). Higher abundance of adult pike in Baltic Sea coastal areas adjacent to restored wetlands compared to reference bays. Hydrobiologia. 850. 2049-2060.
Status: Published -
Berggren, H., Nordahl, O., Yildirim, Y., Larsson, P., Tibblin, P., et al. (2023). Effects of environmental translocation and host characteristics on skin microbiomes of sun-basking fish. Proceedings of the Royal Society of London. Biological Sciences. 290 (2013).
Status: Published -
Sunde, J., Yildirim, Y., Tibblin, P., Bekkevold, D., Skov, C., et al. (2022). Drivers of neutral and adaptive differentiation in pike (Esox lucius) populations from contrasting environments. Molecular Ecology. 31 (4). 1093-1110.
Status: Published -
Bergström, K., Nordahl, O., Söderling, P., Koch-Schmidt, P., Borger, T., et al. (2022). Exceptional longevity in northern peripheral populations of Wels catfish (Siluris glanis). Scientific Reports. 12 (1).
Status: Published -
Flink, H., Nordahl, O., Hall, M., Rarysson, A., Bergström, K., et al. (2021). Examining the effects of authentic C&R on the reproductive potential of Northern pike. Fisheries Research. 243.
Status: Published -
Hall, M., Nordahl, O., Larsson, P., Forsman, A., Tibblin, P. (2021). Intra-population variation in reproductive timing covaries with thermal plasticity of offspring performance in perch Perca fluviatilis. Journal of Animal Ecology. 90 (10). 2236-2347.
Status: Published -
Nordahl, O., Koch-Schmidt, P., Tibblin, P., Forsman, A., Larsson, P. (2020). Vertical movements of coastal pike (Esox lucius) : on the role of sun basking. Ecology of Freshwater Fish. 29 (1). 18-30.
Status: Published -
Nordahl, O., Koch-Schmidt, P., Sunde, J., Yildirim, Y., Tibblin, P., et al. (2019). Genetic differentiation between and within ecotypes of pike (Esox lucius) in the Baltic Sea. Aquatic conservation. 29 (11). 1923-1935.
Status: Published -
Nordahl, O., Tibblin, P., Koch-Schmidt, P., Berggren, H., Larsson, P., et al. (2018). Sun-basking fish benefit from body temperatures that are higher than ambient water. Proceedings of the Royal Society of London. Biological Sciences. 285 (1879).
Status: Published -
Tibblin, P., Berggren, H., Nordahl, O., Larsson, P., Forsman, A. (2016). Causes and consequences of intra-specific variation in vertebral number. Scientific Reports. 6.
Status: Published -
Berggren, H., Nordahl, O., Tibblin, P., Larsson, P., Forsman, A. (2016). Testing for local adaptation to spawning habitat in sympatric subpopulations of northern pike by reciprocal translocation of embryos. PLOS ONE. 11 (5).
Status: Published -
Tibblin, P., Forsman, A., Koch-Schmidt, P., Nordahl, O., Johannessen, P., et al. (2015). Evolutionary divergence of adult body size and juvenile growth in sympatric subpopulations of a top predator in aquatic ecosystems. American Naturalist. 186 (1). 98-110.
Status: Published
Article, review/survey (Refereed)
-
Larsson, P., Tibblin, P., Koch-Schmidt, P., Engstedt, O., Nilsson, J., et al. (2015). Ecology, evolution, and management strategies of northern pike populations in the Baltic Sea. Ambio. 44 (Supplement 3). S451-S461.
Status: Published -
Forsman, A., Tibblin, P., Berggren, H., Nordahl, O., Koch-Schmidt, P., et al. (2015). Pike Esox lucius as an emerging model organism for studies in ecology and evolutionary biology: a review.. Journal of Fish Biology. 87 (2). 472-479.
Status: Published
Doctoral thesis, comprehensive summary (Other academic)
- Nordahl, O. (2018). Intraspecific diversity of pike (Esox lucius) in the Baltic Sea and new insights on thermoregulation in fish. Doctoral Thesis. Växjö, Linnaeus University Press. 39.