Kjartan Østbye

• de Meo, Ilaria; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Hayden, Brian; Fagertun, Christian & Poleo, Antonio (2021). Predator community and resource use jointly modulate the inducible defense response in body height of crucian carp. Ecology and Evolution. ISSN 2045-7758. 11(5), p. 2072–2085. doi: 10.1002/ece3.7176. Full text in Research Archive
• Kozak, Natalia; Ahonen, Salla A.; Keva, Ossi; Østbye, Kjartan; Taipale, Sami J. & Hayden, Brian [Show all 7 contributors for this article] (2021). Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient. Science of the Total Environment. ISSN 0048-9697. 779. doi: 10.1016/j.scitotenv.2021.146261. Full text in Research Archive
• Walton, Zea Ann; Hagenlund, Mari; Østbye, Kjartan; Samelius, Gustaf; Odden, Morten & Norman, Anita J. [Show all 8 contributors for this article] (2021). Moving far, staying close: red fox dispersal patterns revealed by SNP genotyping. Conservation Genetics. ISSN 1566-0621. 22, p. 249–257. doi: 10.1007/s10592-021-01332-7. Full text in Research Archive
• Pettersen, Ruben Alexander; Junge, Claudia; Østbye, Kjartan; Mo, Tor Atle & Vøllestad, Leif Asbjørn (2020). Genetic population structure of the monogenean parasite Gyrodactylus thymalli and its host European grayling (Thymallus thymallus) in a large Norwegian lake. Hydrobiologia. ISSN 0018-8158. 848, p. 547–561. doi: 10.1007/s10750-020-04431-7. Full text in Research Archive
• Taugbøl, Annette; Quinn, Thomas P.; Østbye, Kjartan & Vøllestad, Leif Asbjørn (2020). Allometric relationships in morphological traits associated with foraging, swimming ability, and predator defense reveal adaptations toward brackish and freshwater environments in the threespine stickleback. Ecology and Evolution. ISSN 2045-7758. 10, p. 13412–13426. doi: 10.1002/ece3.6945. Full text in Research Archive Show summary

  Freshwater colonization by threespine stickleback has led to divergence in morphology between ancestral marine and derived freshwater populations, making them ideal for studying natural selection on phenotypes. In an open brackish–freshwater system, we previously discovered two genetically distinct stickleback populations that also differ in geometric shape: one mainly found in the brackish water lagoon and one throughout the freshwater system. As shape and size are not perfectly correlated, the aim of this study was to identify the morphological trait(s) that separated the populations in geometric shape. We measured 23 phenotypes likely to be important for foraging, swimming capacity, and defense against predation. The lateral plate morphs in freshwater displayed few significant changes in trait sizes, but the low plated expressed feeding traits more associated with benthic habitats. When comparing the completely plated genetically assigned populations, the freshwater, the hybrids, the migrants and the lagoon fish, many of the linear traits had different slopes and intercepts in trait‐size regressions, precluding our ability to directly compare all traits simultaneously, which most likely results from low variation in body length for the lagoon and migrant population. We found the lagoon stickleback population to be more specialized toward the littoral zone, displaying benthic traits such as large, deep bodies with smaller eyes compared to the freshwater completely plated morph. Further, the lagoon and migrant fish had an overall higher body coverage of lateral plates compared to freshwater fish, and the dorsal and pelvic spines were longer. Evolutionary constraints due to allometric scaling relationships could explain the observed, overall restricted, differences in morphology between the sticklebacks in this study, as most traits have diversified in common allometric trajectories. The observed differences in foraging and antipredation traits between the fish with a lagoon and freshwater genetic signature are likely a result of genetic or plastic adaptations toward brackish and freshwater environments.

• Tamayo, Ana-Maria Peris; Devineau, Olivier; Præbel, Kim; Kahilainen, Kimmo Kalevi & Østbye, Kjartan (2020). A brain and a head for a different habitat: Size variation in four morphs of Arctic charr (Salvelinus alpinus (L.)) in a deep oligotrophic lake. Ecology and Evolution. ISSN 2045-7758. 10(20), p. 11335–11351. doi: 10.1002/ece3.6771. Full text in Research Archive
• Haugen, Hanne; Linløkken, Arne; Østbye, Kjartan & Heggenes, Jan (2020). Landscape genetics of northern crested newt Triturus cristatus populations in a contrasting natural and human-impacted boreal forest. Conservation Genetics. ISSN 1566-0621. 21(3), p. 515–530. doi: 10.1007/s10592-020-01266-6. Full text in Research Archive
• Østbye, Kjartan; Hassve, Marius Hagen; Tamayo, Ana-Maria Peris; Hagenlund, Mari; Vogler, Thomas & Præbel, Kim (2020). “And if you gaze long into an abyss, the abyss gazes also into thee”: four morphs of Arctic charr adapting to a depth gradient in Lake Tinnsjøen . Evolutionary Applications. ISSN 1752-4571. 13(6), p. 1240–1261. doi: 10.1111/eva.12983. Full text in Research Archive
• Thibert-Plante, Xavier; Præbel, Kim; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Amundsen, Per-Arne & Gavrilets, Sergey (2020). Using mathematical modelling to investigate the adaptive divergence of whitefish in Fennoscandia. Scientific Reports. ISSN 2045-2322. 10. doi: 10.1038/s41598-020-63684-3. Full text in Research Archive
• Hagenlund, Mari; Linløkken, Arne N.; Østbye, Kjartan; Walton, Zea Ann; Odden, Morten & Samelius, Gustav [Show all 8 contributors for this article] (2019). Genetic Structure and Gene flow in Red Foxes (Vulpes vulpes) in Scandinavia: Implications for the Potential Future Spread of Echinococcus multilocularis Tapeworm . Applied Sciences. ISSN 2076-3417. doi: 10.3390/app9245289. Full text in Research Archive
• Wilson, Robert Charles; Østbye, Kjartan; Angell, Inga Leena & Rudi, Knut (2019). Association between diet and rumen microbiota in wild roe deer. FEMS Microbiology Letters. ISSN 0378-1097. 366(6), p. 1–5. doi: 10.1093/femsle/fnz060.
• Linløkken, Arne N.; Næstad, Frode; Langdal, Kjell & Østbye, Kjartan (2019). Comparing Fish Density and Echo Strength Distribution Recorded by Two Generations of Single Beam Echo Sounders. Applied Sciences. ISSN 2076-3417. 9(10), p. 1–11. doi: 10.3390/app9102041. Full text in Research Archive
• Østbye, Kjartan; Østbye, Eivind; Lien, Anne May; Lee, Laura R.; Lauritzen, Stein-Erik & Carlini, David B. (2018). Morphology and life history divergence in cave and surface populations of Gammarus lacustris (L.). PLOS ONE. ISSN 1932-6203. 13(10), p. 1–32. doi: 10.1371/journal.pone.0205556. Full text in Research Archive
• Häkli, Katja; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Amundsen, Per-Arne & Præbel, Kim (2018). Diversifying selection drives parallel evolution of gill raker number and body size along the speciation continuum of European whitefish. Ecology and Evolution. ISSN 2045-7758. 8(5), p. 2617–2631. doi: 10.1002/ece3.3876. Full text in Research Archive Show summary

  Adaptive radiation is the evolution of ecological and phenotypical diversity. It arises via ecological opportunity that promotes the exploration of underutilized or novel niches mediating specialization and reproductive isolation. The assumed precondition for rapid local adaptation is diversifying natural selection, but random genetic drift could also be a major driver of this process. We used 27 populations of European whitefish (Coregonus lavaretus) from nine lakes distributed in three neighboring subarctic watercourses in northern Fennoscandia as a model to test the importance of random drift versus diversifying natural selection for parallel evolution of adaptive phenotypic traits. We contrasted variation for two key adaptive phenotypic traits correlated with resource utilization of polymorphic fish; the number of gill rakers and the total length of fish, with the posterior distribution of neutral genetic differentiation from 13 microsatellite loci, to test whether the observed phenotypic divergence could be achieved by random genetic drift alone. Our results show that both traits have been under diversifying selection and that the evolution of these morphs has been driven by isolation through habitat adaptations. We conclude that diversifying selection acting on gill raker number and body size has played a significant role in the ongoing adaptive radiation of European whitefish morphs in this region.

• Østbye, Kjartan; Taugbøl, Annette; Ravinet, Mark; Harrod, Chris; Pettersen, Ruben Alexander & Bernatchez, Louis [Show all 7 contributors for this article] (2018). Ongoing niche differentiation under high gene flow in a polymorphic brackish water threespine stickleback (Gasterosteus aculeatus) population. BMC Evolutionary Biology. ISSN 1471-2148. 18(14), p. 1–18. doi: 10.1186/s12862-018-1128-y. Full text in Research Archive Show summary

  Background: Marine threespine sticklebacks colonized and adapted to brackish and freshwater environments since the last Pleistocene glacial. Throughout the Holarctic, three lateral plate morphs are observed; the low, partial and completely plated morph. We test if the three plate morphs in the brackish water Lake Engervann, Norway, differ in body size, trophic morphology (gill raker number and length), niche (stable isotopes; δ15N, δ13C, and parasites (Theristina gasterostei, Trematoda spp.)), genetic structure (microsatellites) and the lateral-plate encoding Stn382 (Ectodysplasin) gene. We examine differences temporally (autumn 2006/spring 2007) and spatially (upper/lower sections of the lake – reflecting low versus high salinity). Results: All morphs belonged to one gene pool. The complete morph was larger than the low plated, with the partial morph intermediate. The number of lateral plates ranged 8–71, with means of 64.2 for complete, 40.3 for partial, and 14.9 for low plated morph. Stickleback δ15N was higher in the lower lake section, while δ13C was higher in the upper section. Stickleback isotopic values were greater in autumn. The low plated morph had larger variances in δ15N and δ13C than the other morphs. Sticklebacks in the upper section had more T. gasterostei than in the lower section which had more Trematoda spp. Sticklebacks had less T. gasterostei, but more Trematoda spp. in autumn than spring. Sticklebacks with few and short rakers had more T. gasterostei, while sticklebacks with longer rakers had more Trematoda. spp. Stickleback with higher δ15N values had more T. gasterostei, while sticklebacks with higher δ15N and δ13C values had more Trematoda spp. The low plated morph had fewer Trematoda spp. than other morphs. Conclusions: Trait-ecology associations may imply that the three lateral plate morphs in the brackish water lagoon of Lake Engervann are experiencing ongoing divergent selection for niche and migratory life history strategies under high gene flow. As such, the brackish water zone may generally act as a generator of genomic diversity to be selected upon in the different environments where threespine sticklebacks can live. Adaptation, Ectodysplasin, Evolution, Gill raker, Natural selection, Panmixia, Stable isotope analyses, Stn382, Theristina gasterostei, Trematoda spp

• Østbye, Kjartan; Wilson, Robert Charles & Rudi, Knut (2016). Rumen microbiota for wild boreal cervids living in the same habitat. FEMS Microbiology Letters. ISSN 0378-1097. 363(20), p. 1–6. doi: 10.1093/femsle/fnw233.
• Wiig, Elisabeth; Reseland, Janne Elin; Østbye, Kjartan; Haugen, Håvard Jostein & Vøllestad, Leif Asbjørn (2016). Variation in Lateral Plate Quality in Threespine Stickleback from Fresh, Brackish and Marine Water: A Micro-Computed Tomography Study. PLOS ONE. ISSN 1932-6203. 11(10). doi: 10.1371/journal.pone.0164578.
• Klepaker, Tom Olav; Østbye, Kjartan; Spence, Rowena; Warren, Mark; Przybylski, Mirosław & Smith, Carl (2016). Selective agents in the adaptive radiation of Hebridean sticklebacks. Evolutionary Ecology Research. ISSN 1522-0613. 17(2), p. 243–262.
• Østbye, Kjartan; Harrod, Chris; Gregersen, Finn; Klepaker, Tom Olav; Schulz, Michael & Schluter, Dolph [Show all 7 contributors for this article] (2016). The temporal window of ecological adaptation in postglacial lakes: a comparison of head morphology, trophic position and habitat use in Norwegian threespine stickleback populations. BMC Evolutionary Biology. ISSN 1471-2148. 16(102), p. 1–16. doi: 10.1186/s12862-016-0676-2.
• Mazzarella, Anna; Boessenkool, Sanne; Østbye, Kjartan; Vøllestad, Leif Asbjørn & Trucchi, Emiliano (2016). Genomic signatures of the plateless phenotype in the threespine stickleback. Ecology and Evolution. ISSN 2045-7758. 6(10), p. 3161–3173. doi: 10.1002/ece3.2072. Full text in Research Archive
• Pettersen, Ruben Alexander; Østbye, Kjartan; Holmen, Johannes; Vøllestad, Leif Asbjørn & Mo, Tor Atle (2016). Gyrodactylus spp. diversity in native and introduced minnow (Phoxinus phoxinus) populations: no support for "the enemy release" hypothesis. Parasites & Vectors. ISSN 1756-3305. 9(51). doi: 10.1186/s13071-016-1306-y.
• Hagenlund, Mari; Østbye, Kjartan; Langdal, Kjell; Hassve, Marius Hagen; Pettersen, Ruben Alexander & Anderson, Eric [Show all 8 contributors for this article] (2015). Fauna crime: elucidating the potential source and introduction history of European smelt (Osmerus eperlanus L.) into Lake Storsjøen, Norway. Conservation Genetics. ISSN 1566-0621. 16(5), p. 1085–1098. doi: 10.1007/s10592-015-0724-2. Full text in Research Archive
• Østbye, Kjartan (2014). Siken (Coregonus lavaretus L., 1758): et artskompleks med en spennende evolusjonær historie og forvaltningsmessige utfordringer. In Storaas, Torstein & Langdal, Kjell (Ed.), Ikkje berre ulv og bly - glimt frå forskninga på Evenstad. Oplandske Bokforlag. ISSN 978-82-7518-223-2. p. 337–359.
• Taugbøl, Annette; Arntsen, Tina; Østbye, Kjartan & Vøllestad, Leif Asbjørn (2014). Small Changes in Gene Expression of Targeted Osmoregulatory Genes When Exposing Marine and Freshwater Threespine Stickleback (Gasterosteus aculeatus) to Abrupt Salinity Transfers. PLOS ONE. ISSN 1932-6203. 9(9), p. 1–9. doi: 10.1371/journal.pone.0106894. Full text in Research Archive
• Bray, Sarah C.; Austin, Jeremy; Metcalf, Jessica L.; Østbye, Kjartan; Østbye, Eivind & Lauritzen, Stein-Erik [Show all 10 contributors for this article] (2013). Ancient DNA identifies post-glacial recolonisation, not recent bottlenecks, as the primary driver of contemporary mtDNA phylogeography and diversity in Scandinavian brown bears. Diversity and Distributions: A journal of biological invasions and biodiversity. ISSN 1366-9516. 19(3), p. 245–256. doi: 10.1111/j.1472-4642.2012.00923.x.
• Narauskaite, G.; Danusevicius, D.; Østbye, Kjartan & Petelis, K. (2013). Genetic differentiation of field and forest ecotypes of roe deer (Capreolus capreolus L.) in Lithuania based on DNA markers . Rural development Proceedings. ISSN 2345-0916. 6(3), p. 376–381.
• Voje, Kjetil Lysne; Mazzarella, Anna Virginia Black; Hansen, Thomas F; Østbye, Kjartan; Klepaker, Tom Olav & Bass, Arthur [Show all 10 contributors for this article] (2013). Adaptation and constraint in a stickleback radiation. Journal of Evolutionary Biology. ISSN 1010-061X. 26(11), p. 2396–2414. doi: 10.1111/jeb.12240.
• Præbel, Kim; Knudsen, Rune; Siwertsson, Anna; Karhunen, Markku; Kahilainen, Kimmo K. & Ovaskainen, Otso [Show all 10 contributors for this article] (2013). Ecological speciation in postglacial European whitefish: rapid adaptive radiations into the littoral, pelagic, and profundal lake habitats. Ecology and Evolution. ISSN 2045-7758. 3(15), p. 4970–4986. doi: 10.1002/ece3.867. Full text in Research Archive
• Klepaker, Tom Olav; Østbye, Kjartan & Bell, Michael A. (2013). Regressive evolution of the pelvic complex in stickleback fishes: a study of convergent evolution. Evolutionary Ecology Research. ISSN 1522-0613. 15(4), p. 413–435.
• Grøtan, Kyrre; Østbye, Kjartan; Taugbøl, Annette & Vøllestad, Leif Asbjørn (2012). No short-term effect of salinity on oxygen consumption in threespine stickleback (Gasterosteus aculeatus) from fresh, brackish and salt water. Canadian Journal of Zoology. ISSN 0008-4301. 90(12), p. 1386–1393. doi: 10.1139/cjz-2012-0121.
• Klepaker, Tom Olav; Østbye, Kjartan; Bernatchez, Louis & Vøllestad, Leif Asbjørn (2012). Spatio-temporal patterns in pelvic reduction in threespine stickleback (Gasterosteus aculeatus L.) in Lake Storvatnet. Evolutionary Ecology Research. ISSN 1522-0613. 14(2), p. 169–191.
• Kahilainen, Kimmo K.; Østbye, Kjartan; Harrod, Chris; Shikano, Takahito; Malinen, Tommi & Merilä, Juha (2011). Species introduction promotes hybridization and introgression in Coregonus: is there sign of selection against hybrids? Molecular Ecology. ISSN 0962-1083. 20(18), p. 3838–3855. doi: 10.1111/j.1365-294X.2011.05209.x.
• Gregersen, Finn; Vøllestad, Leif Asbjørn; Østbye, Kjartan; Aass, Per & Hegge, O. (2011). Temperature and food-level effects on reproductive investment and egg mass in vendace, Coregonus albula. Fisheries Management and Ecology. ISSN 0969-997X. 18(4), p. 263–269. doi: 10.1111/j.1365-2400.2010.00779.x.
• Le Rouzic, Arnaud; Østbye, Kjartan; Klepaker, Tom Olav; Hansen, Thomas F; Bernatchez, Louis & Schluter, Dolph [Show all 7 contributors for this article] (2011). Strong and consistent natural selection associated with armour reduction in sticklebacks. Molecular Ecology. ISSN 0962-1083. 20, p. 2483–2493. doi: 10.1111/j.1365-294X.2011.05071.x.
• Davison, John; Ho, Simon Y.W.; Bray, Sarah C.; Korsten, Marju; Tammeleht, Egle & Hindrikson, Maris [Show all 12 contributors for this article] (2011). Late-Quaternary biogeographic scenarios for the brown bear (Ursus arctos), a wild mammal model species. Quaternary Science Reviews. ISSN 0277-3791. 30(3-4), p. 418–430. doi: 10.1016/j.quascirev.2010.11.023.
• Gregersen, Finn; Vøllestad, Leif Asbjørn; Østbye, Kjartan; Aass, Per & Hegge, O. (2011). Temperature and food-level effects on reproductive investment and egg mass in vendace Coregonus albula (L.). Ecology of Freshwater Fish. ISSN 0906-6691. 18, p. 263–269. doi: 10.1111/j.1365-2400.2010.00779.x.
• Bernatchez, Louis; Renaut, Sébasitien; Whiteley, A.R.; Derome, N.; Jeukens, J. & Landry, L. [Show all 11 contributors for this article] (2010). On the origin of species: insights from the ecological genomics of lake whitefish. Philosophical Transactions of the Royal Society of London. Biological Sciences. ISSN 0962-8436. 365(1547), p. 1783–1800. doi: 10.1098/rstb.2009.0274.
• Bjærke, Oda; Østbye, Kjartan; Lampe, Helene M. & Vøllestad, Leif Asbjørn (2010). Covariation in shape and foraging behaviour in lateral plate morphs in the three-spined stickleback. Ecology of Freshwater Fish. ISSN 0906-6691. 19, p. 249–256. doi: 10.1111/j.1600-0633.2010.00409.x.
• Østbye, Eivind; Breiehagen, Torgrim; Mysterud, Ivar & Østbye, Kjartan (2009). Occurrence and habitat choice of waders in a high mountain sedimentation flat on Hardangervidda, South Norway. Ornis Norvegica. ISSN 1502-0878. 32(1), p. 74–90.
• Klepaker, Tom Olav & Østbye, Kjartan (2008). Pelvic anti-predator armour reduction in Norwegian populations of the threespine stickleback: a rare phenomenon with adaptive implications? Journal of Zoology. ISSN 0952-8369. 276, p. 81–88. doi: 10.1111/j.1469-7998.2008.00471.x.
• Østbye, Eivind; Hogstad, Olav; Østbye, Kjartan; Framstad, Erik & Breiehagen, Torgrim (2007). Structure and dynamics of a high mountain wetland bird community in southern Norway: An 18-years study of waders and gulls. Ornis Norvegica. ISSN 1502-0878. 30(2), p. 4–20.
• Sandlund, Odd Terje; Museth, J; Taugbøl, Trond & Østbye, Kjartan (2007). Population characteristics of whitefish (Coregonus lavaretus) in a 30 year old river reservoir: Løpsjøen, SE Norway. Advances in Limnology. ISSN 1612-166X. p. 205–212.
• Østbye, Eivind; Hogstad, Olav; Østbye, Kjartan; Lien, Leif; Framstad, Erik & Breiehagen, T (2007). Structure and dynamics of a high mountain vader community in South Norway: a 18 year study of passerines. Ornis Norvegica. ISSN 1502-0878. 30, p. 4–20.
• Østbye, Eivind; Lauritzen, Stein-Erik; Moe, Dagfinn & Østbye, Kjartan (2006). Vertebrate remains in Holocene limestone cave sediments: faunal succession in the Sirijorda Cave, northern Norway. Boreas. ISSN 0300-9483. 35(1), p. 142–158. doi: 10.1080/03009480500359129.
• Østbye, Eivind; Lauritzen, Stein-Erik; Østbye, Kjartan & Wiig, Øystein (2006). Holocene brown bear (Ursus arctos L.) from Norwegian caves. Boreas. ISSN 0300-9483. 35(2; doi: 10.1080/03009480600578107), p. 296–316. doi: 10.1080/03009480600578107.
• Østbye, Eivind; Østbye, Vesla & Østbye, Kjartan (2006). Av smågnagere og spissmus i Skrimfjell-området er klatremus den vanligste. Langs Lågen. ISSN 0332-7019. p. 160–170.
• Østbye, Eivind; Lauritzen, Stein-Erik; Moe, Dagfinn & Østbye, Kjartan (2006). Vertebrate remains in Holocene limstone cave sediments: faunal succesion in the Sirijorda Cave, northern Norway. Boreas. ISSN 0300-9483. 35(1), p. 142–158. doi: 10.1080/03009480500359129.
• Østbye, Kjartan; Amundsen, Per-Arne; Bernatchez, Louis; Klemetsen, Anders; Knudsen, Rune & Kristoffersen, Rune [Show all 8 contributors for this article] (2006). Parallel evolution of ecomorphological traits in the European whitefish Coregonus lavaretus (L.) species complex during postglacial times. Molecular Ecology. ISSN 0962-1083. p. 3983–4001. doi: 10.1111/j.1365-294X.2006.03062.x.
• Kahilainen, Kimmo & Østbye, Kjartan (2006). Morphological differentiation and resource polymorphism in three sympatric whitefish Coregonus lavaretus (L.) forms in a subarctic lake. Journal of Fish Biology. ISSN 0022-1112. p. 63–79. doi: 10.1111/j.1095-8649.2005.00876.x.
• Schulz, Michael; Freyhof, Jörg; Saint-Laurent, Robert; Østbye, Kjartan; Mehner, Thomas & Bernatchez, Louis (2006). Evidence for independent origin of two spring-spawning ciscoes (Salmoniformes: Coregonidae) in Germany. Journal of Fish Biology. ISSN 0022-1112. p. 119–135. doi: 10.1111/j.1095-8649.2006.01039.x.
• Kahilainen, K & Østbye, Kjartan (2006). Morphological differentiation and resource polymorphism in three sympatric whitefish Coregonus lavaretus (L.) forms in a subarctic lake. Journal of Fish Biology. ISSN 0022-1112. 68(1), p. 63–79.
• Østbye, Kjartan; Næsje, T.F.; Bernatchez, L; Sandlund, OT & Hindar, Ketil (2005). Morphological divergence and origin of sympatric populations of European whitefish (Coregonus lavaretus L.) in Lake Femund, Norway. Journal of Evolutionary Biology. ISSN 1010-061X. 18.
• Odegaard, F; Diserud, OH & Østbye, Kjartan (2005). The importance of plant relatedness for host utilization among phytophagous insects. Ecology Letters. ISSN 1461-023X. 8.
• Østbye, Kjartan; Bernatchez, Louis; Næsje, Tor F.; Himberg, Mikael & Hindar, Kjetil (2005). Evolutionary history of the European whitefish Coregonus lavaretus (L.) species complex as inferred from mtDNA phylogeography and gillraker numbers. Molecular Ecology. ISSN 0962-1083. 14, p. 4371–4387.
• Østbye, Kjartan; Næsje, Tor; Bernatchez, Louis; Sandlund, Odd Terje & Hindar, Kjetil (2005). Morphological divergence and origin of sympatric populations of European whitefish (Coregonus lavaretus L.) in Lake Femund, Norway. Journal of Evolutionary Biology. ISSN 1010-061X. 18, p. 683–702.
• Ugedal, Ola; Næsje, Tor F.; Saksgård, Randi; Sandlund, Odd Terje & Østbye, Kjartan (2002). Do commercial gill-net fisheries impact polymorphic European whitefish in Lake Femund, Norway? Advances in Limnology. ISSN 1612-166X. 57, p. 563–576.
• Sandlund, Odd Terje; Næsje, Tor F.; Saksgård, Randi & Østbye, Kjartan (2002). Gillraker development in juvenile polymorphic European whitefish (Coregonus lavaretus L.) in Lake Femund, Norway. Advances in Limnology. ISSN 1612-166X. 57, p. 553–562.
• Sandlund, Odd Terje; Næsje, Tor Fredrik; Saksgård, Randi & Østbye, Kjartan (2002). Gillraker development in juvenile polymorphic whitefish (Coregonus lavaretus L.) in Lake Femund, Norway. Advances in Limnology. ISSN 1612-166X. 57, p. 553–562.
• Østbye, Kjartan; Øxnevad, Sigurd & Vøllestad, Leif Asbjørn (1997). Developmental stability in perch (Perca fluviatilis L.) in acidic aluminium-rich lakes. Canadian Journal of Zoology. ISSN 0008-4301. 75, p. 919–928.
• Øxnevad, Sigurd Arne; Østbye, Kjartan & Vøllestad, Leif Asbjørn (1995). Year class variation in fluctuating asymmetry in perch (Perca fluviatilis L.) from an acidic aluminium rich lake. Ecology of Freshwater Fish. ISSN 0906-6691. 4, p. 131–137.
• Poleo, A. B. S.; Øxnevad, Sigurd; Østbye, Kjartan; Andersen, Ronny & Oughton, D. H. (1995). Survival of crucian carp, Carassius carassius, exposed to a high low-molecular weight inorganic aluminium challenge. Aquatic Sciences. ISSN 1015-1621. 57, p. 350–359.

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• Pedersen, Simen; Østbye, Kjartan; Præbel, Kim & Bakmann, Ole (2017). Use of DNA technology to define moose populations for management.
• Østbye, Kjartan; Præbel, Kim; Pedersen, Simen & Bakmann, Ole (2017). Genetiske metoder bør brukes i vår fremtidige forvaltning av viltarter i Norge. Hjorteviltet. ISSN 1502-3729. p. 34–37.
• Pedersen, Simen; Østbye, Kjartan; Præbel, Kim; Bakmann, Ole; Linløkken, Arne & Mathisen, Karen Marie [Show all 9 contributors for this article] (2016). Bruk av DNA teknologi for å definere elgpopulasjoner.
• Pedersen, Simen; Østbye, Kjartan; Præbel, Kim; Bakmann, Ole; Linløkken, Arne & Mathisen, Karen Marie [Show all 9 contributors for this article] (2016). Bruk av DNA teknologi for å definere elgpopulasjoner.
• Hagenlund, Mari; Præbel, Kim & Østbye, Kjartan (2015). Krøkle-mysteriet i Storsjøen er løst. [Internet]. Forskning.no.
• Østbye, Kjartan & Præbel, Kim (2015). In the abyss part I: postglacial adaptive radiation of the Lake Tinnsjøen Arctic charr.
• Præbel, Kim & Østbye, Kjartan (2015). Into the abyss, part II: Phenotype-genotype assignment, putative evolutionary origin and chronology of divergence of the four Arctic charr morphs in Lake Tinnsjøen.
• Taugbøl, Annette; Arntsen, Tina; Østbye, Kjartan & Vøllestad, Leif Asbjørn (2015). Small changes in gene expression of targeted osmoregulatory genes when exposing marine and freshwater Threespine Stickleback (Gasterosteus aculeatus) to abrupt salinity transfers.
• Mazzarella, Anna; Boessenkool, Sanne; Østbye, Kjartan; Vøllestad, Leif Asbjørn & Trucchi, Emiliano (2015). Genomic signatures of the plateless phenotype in the Threespine Stickleback.
• Semb-Johansson, Arne; Østbye, Eivind & Østbye, Kjartan (2014). Nordpaddens Bufo bufo habitatvalg på ei øy i Østfold-skjærgården, Søndre Sandøy. . Fauna. ISSN 0014-8881. 65, p. 138–150.
• Mazzarella, Anna Virginia Black; Østbye, Kjartan & Vøllestad, Leif Asbjørn (2013). Looking for genomic signatures of platelessness in the threespine stickleback (Gasterosteus aculeatus).
• Mazzarella, Anna Virginia Black; Østbye, Kjartan & Vøllestad, Leif Asbjørn (2013). Looking for genomic signatures of platelessness in the threespine stickleback (Gasterosteus aculeatus).
• Østbye, Kjartan; Præbel, Kim; Knudsen, Rune; Siwertsson, Anna & Amundsen, Per-Arne (2011). Adaptive niche proliferation of polymorphic whitefish along the Kautokeino riversystem in northern Norway.
• Præbel, Kim; Østbye, Kjartan; Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo K. & Fevolden, Svein-Erik [Show all 7 contributors for this article] (2011). Parallel post-glacial re-colonisation of European whitefish morphs in northern Fennoscandia.
• Østbye, Kjartan; Bernatchez, Louis & Vøllestad, Leif Asbjørn (2009). Association between lateral plate morphs and Eda gene QTLs in threespine sticklebacks along a salinity gradient in Norway.
• Østbye, Kjartan; Vøllestad, Leif Asbjørn; Hansen, Thomas; Arnaud, le Rouzic & Bernatchez, Louis (2009). Population structure and phenotypic patterns in the threespine stickleback along a salinity gradient in south - eastern Norway.
• Østbye, Kjartan; Klepaker, Tom; Vøllestad, Leif Asbjørn & Bernatchez, Louis (2009). Pelvic anti-predator armor reduction in a threespinestickleback population.
• Østbye, Kjartan (2009). Adaptive radiation of the Norwegian threespine stickleback.
• Østbye, Kjartan (2008). Fiskenes Don Juan. [TV]. Uti Naturen NRK1; http://www1.nrk.no/nett-tv/natur/.
• Østbye, Kjartan (2008). Fiskeplanar på Finse. [Newspaper]. Hordaland.
• Østbye, Kjartan (2008). Adaptive radiation in the coastal Norwegian threespine stickleback.
• Østbye, Kjartan (2008). Ecological speciation in northern freshwater fishes: datasets of the European whitefish and the threespine stickleback.
• Østbye, Kjartan (2008). Røya i Finsevatn: forskning, forvaltning og fiske.
• Østbye, Kjartan (2007). Spennende stingsild i Storvatnet. [Newspaper]. Bladet Vesterålen.
• Østbye, Kjartan (2007). Løser Stingsildas hemmelighet. [Newspaper]. Bladet Vesterålen.
• Østbye, Kjartan (2007). Røya på Finse: fiske og forvaltning.
• Østbye, Kjartan (2006). Hvordan har Stingsilda det? [Newspaper]. Lofotposten.
• Østbye, Kjartan (2006). Fisker Stingsild. [Newspaper]. Lofot-Tidende.
• Østbye, Kjartan (2006). På Stingsildraid i Andøy-vannene. [Newspaper]. Andøyposten.
• Østbye, Kjartan (2005). The European whitefish: historical contingency and evolutionary events.
• Østbye, Kjartan (2002). Phylogeography of the European whitefish (Coregonus lavaretus L.).
• Østbye, Kjartan (2002). The European whitefish (Coregonus lavaretus L.): phylogeography, evolution and management.
• Østbye, Kjartan (1999). Gill raker distributions in European whitefish (Coregonus lavaretus species complex): limiting similarity of coexisting competitors.
• Østbye, Eivind; Østbye, Kjartan & Østbye, Ingrid Margrethe (1998). Beveren i Ravalsjø-området. Langs Lågen. ISSN 0332-7019. 3, p. 98–106.
• Østbye, Eivind; Østbye, Kjartan & Mysterud, Atle (1997). Mer effektiv rådyrjakt: Når og hvor felles flest rådyr? Jakt og fiske. ISSN 0800-3041. p. 60–62.
• Øxnevad, Sigurd Arne; Poléo, A.B.S.; Østbye, Kjartan; Andersen, Ronny; Heibo, Erik & Vøllestad, Leif Asbjørn (1995). En ny teori om karussens innvandring og utbredelse i Norge. Fauna. ISSN 0014-8881. 4, p. 123–127.
• Dønnum, Bjørn Otto; Fjeldseth, Øyvind; Haugen, Thrond Oddvar; Heibo, Erik; Kristjanson, Laurus & Rygg, Tor Arne [Show all 9 contributors for this article] (1995). Rotenonbehandling av Rauma-laks for enhver pris? Biolog. ISSN 0801-0722. 4, p. 9–12.
• Wiig, Elisabeth; Vøllestad, Leif Asbjørn & Østbye, Kjartan (2014). Variation in armour of the three-spine stickleback. Department of Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo.
• Arntsen, Tina; Vøllestad, Leif Asbjørn; Taugbøl, Annette & Østbye, Kjartan (2012). Variation in expression of genes involved in osmoregulation in the threespine stickleback (Gasterosteus aculeatus) when exposed to different levels of salinity. Department of Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo.

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