Blar i Publikasjoner fra Cristin - INN på forfatter "Østbye, Kjartan"
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Allometric relationships in morphological traits associated with foraging, swimming ability, and predator defense reveal adaptations toward brackish and freshwater environments in the threespine stickleback
Taugbøl, Annette; Quinn, Thomas P.; Østbye, Kjartan; Vøllestad, Leif Asbjørn (Peer reviewed; Journal article, 2020)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 ... -
“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
Østbye, Kjartan; Hassve, Marius Hagen; Tamayo, Ana-Maria Peris; Hagenlund, Mari; Vogler, Thomas; Præbel, Kim (Peer reviewed; Journal article, 2020)The origin of species is a central topic in biology. Ecological speciation might be a driver in adaptive radiation, providing a framework for understanding mechanisms, level, and rate of diversification. The Arctic charr ... -
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
Tamayo, Ana-Maria Peris; Devineau, Olivier; Præbel, Kim; Kahilainen, Kimmo Kalevi; Østbye, Kjartan (Peer reviewed; Journal article, 2020)Adaptive radiation is the diversification of species to different ecological niches and has repeatedly occurred in different salmonid fish of postglacial lakes. In Lake Tinnsjøen, one of the largest and deepest lakes in ... -
Comparing Fish Density and Echo Strength Distribution Recorded by Two Generations of Single Beam Echo Sounders
Linløkken, Arne N.; Næstad, Frode; Langdal, Kjell; Østbye, Kjartan (Peer reviewed; Journal article, 2019) -
Diversifying selection drives parallel evolution of gill raker number and body size along the speciation continuum of European whitefish
Häkli, Katja; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Amundsen, Per-Arne; Præbel, Kim (Peer reviewed; Journal article, 2018)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 ... -
Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient
Kozak, Natalia; Ahonen, Salla A.; Keva, Ossi; Østbye, Kjartan; Taipale, Sami J.; Hayden, Brian; Kahilainen, Kimmo K. (Peer reviewed; Journal article, 2021)Subarctic lakes are getting warmer and more productive due to the joint effects of climate change and intensive land-use practices (e.g. forest clear-cutting and peatland ditching), processes that potentially increase ... -
Fauna crime: elucidating the potential source and introduction history of European smelt (Osmerus eperlanus L.) into Lake Storsjøen, Norway
Hagenlund, Mari; Østbye, Kjartan; Langdal, Kjell; Hassve, Marius Hagen; Pettersen, Ruben Alexander; Anderson, Eric; Gregersen, Finn; Præbel, Kim (Peer reviewed; Journal article, 2015)The ability to accurately determine the original source of invading species offers several powerful applications in invasive species ecology and management and may enable important information on the invading species in ... -
Genetic diversity, gene flow, and landscape resistance in a pond-breeding amphibian in agricultural and natural forested landscapes in Norway
Haugen, Hanne; Dervo, Børre Kind; Østbye, Kjartan; Heggenes, Jan; Devineau, Olivier; Linløkken, Arne N. (Peer reviewed; Journal article, 2023)Genetic diversity is a key part of biodiversity, threatened by human activities that lead to loss of gene flow and reduction of effective population sizes. Gene flow is a result of both landscape connectivity and demographic ... -
Genetic population structure of the monogenean parasite Gyrodactylus thymalli and its host European grayling (Thymallus thymallus) in a large Norwegian lake
Pettersen, Ruben Alexander; Junge, Claudia; Østbye, Kjartan; Mo, Tor Atle; Vøllestad, Leif Asbjørn (Peer reviewed; Journal article, 2020)Understanding how populations are structured in space and time is a central question in evolutionary biology. Parasites and their hosts are assumed to evolve together, however, detailed understanding of mechanisms leading ... -
Genetic Structure and Gene flow in Red Foxes (Vulpes vulpes) in Scandinavia: Implications for the Potential Future Spread of Echinococcus multilocularis Tapeworm
Hagenlund, Mari; Linløkken, Arne N.; Østbye, Kjartan; Walton, Zea Ann; Odden, Morten; Samelius, Gustav; Willebrand, Tomas; Wilson, Robert Charles (Peer reviewed; Journal article, 2019) -
Landscape genetics of northern crested newt Triturus cristatus populations in a contrasting natural and human-impacted boreal forest
Haugen, Hanne; Linløkken, Arne; Østbye, Kjartan; Heggenes, Jan (Peer reviewed; Journal article, 2020)Among vertebrates, amphibians currently have the highest proportion of threatened species worldwide, mainly through loss of habitat, leading to increased population isolation. Smaller amphibian populations may lose more ... -
Mercury and amino acid content relations in northern pike (Esox lucius) in subarctic lakes along a climate-productivity gradient
Kozak, Natalia; Kahilainen, Kimmo Kalevi; Pakkanen, Hannu K.; Hayden, Brian; Østbye, Kjartan; Taipale, Sami J. (Peer reviewed; Journal article, 2023)Mercury is a highly toxic element for consumers, but its relation to amino acids and physiology of wild fish is not well known. The main aim of this study was to evaluate how total mercury content (THg) of northern pike ... -
Morphology and life history divergence in cave and surface populations of Gammarus lacustris (L.)
Østbye, Kjartan; Østbye, Eivind; Lien, Anne May; Lee, Laura R.; Lauritzen, Stein-Erik; Carlini, David B. (Peer reviewed; Journal article, 2018) -
Moving far, staying close: red fox dispersal patterns revealed by SNP genotyping
Walton, Zea Ann; Hagenlund, Mari; Østbye, Kjartan; Samelius, Gustaf; Odden, Morten; Norman, Anita J.; Willebrand, Tomas; Spong, Göran (Peer reviewed; Journal article, 2021)The genetic structure of a population can provide important insights into animal movements at varying geographical scales. Individual and social behaviors, such as philopatry and dispersal, affect patterns of relatedness, ... -
Ongoing niche differentiation under high gene flow in a polymorphic brackish water threespine stickleback (Gasterosteus aculeatus) population
Østbye, Kjartan; Taugbøl, Annette; Ravinet, Mark; Harrod, Chris; Pettersen, Ruben Alexander; Bernatchez, Louis (Peer reviewed; Journal article, 2018)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 ... -
Predator community and resource use jointly modulate the inducible defense response in body height of crucian carp
de Meo, Ilaria; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Hayden, Brian; Fagertun, Christian; Poleo, Antonio (Peer reviewed; Journal article, 2021)Phenotypic plasticity can be expressed as changes in body shape in response to environmental variability. Crucian carp (Carassius carassius), a widespread cyprinid, displays remarkable plasticity in body morphology and ... -
Predicting Habitat Properties Using Remote Sensing Data: Soil pH and Moisture, and Ground Vegetation Cover
Haugen, Hanne; Devineau, Olivier; Heggenes, Jan; Østbye, Kjartan; Linløkken, Arne N. (Peer reviewed; Journal article, 2022)Remote sensing data comprise a valuable information source for many ecological landscape studies that may be under-utilized because of an overwhelming amount of processing methods and derived variables. These complexities, ... -
Resource use of crucian carp along a lake productivity gradient is related to body size, predation risk, and resource competition
de Meo, Ilaria; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Hayden, Brian; Magnus, Marius; Poléo, Antonio B. S. (Peer reviewed; Journal article, 2022)Generalist fish species can feed on a wide resource spectrum and across trophic levels depending on resource availability and trophic interactions. Crucian carp (Carassius carassius) represents a good candidate species to ... -
The role of predation risk in structuring life-history traits of crucian carp (Carassius carassius) in a series of small boreal lakes
de Meo, Ilaria; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Poleo, Antonio (Peer reviewed; Journal article, 2023)Predation is a major evolutionary force determining life-history traits in prey by directand indirect mechanisms. This study focuses on life-history trait variation in cruciancarp (Carassius carassius), a species well known ... -
Using mathematical modelling to investigate the adaptive divergence of whitefish in Fennoscandia
Thibert-Plante, Xavier; Præbel, Kim; Østbye, Kjartan; Kahilainen, Kimmo Kalevi; Amundsen, Per-Arne; Gavrilets, Sergey (Peer reviewed; Journal article, 2020)Modern speciation theory has greatly benefited from a variety of simple mathematical models focusing on the conditions and patterns of speciation and diversification in the presence of gene flow. Unfortunately the application ...