Blar i Brage INN på forfatter "Østbye, Kjartan"
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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, ... -
Regressive evolution of the pelvic complex in stickleback fishes: a study of convergent evolution
Klepaker, Tom; Østbye, Kjartan; Bell, Michael A. (Journal article; Peer reviewed, 2013)Background: Regressive evolution of the pelvic complex has been observed in populations of three of five stickleback genera, Gasterosteus, Pungitius, and Culaea, from young freshwater habitats (<18,000 years old). It has ... -
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 ... -
Siken (Coregonus lavaretus L., 1758 ) : et artskompleks med en spennende evolusjonær historie og forvaltningmessige utfordringer
Østbye, Kjartan (Chapter; Peer reviewed, 2015)Siken varierer mye i utseende innen og mellom vann. Her oppsummerer jeg egen, og til dels annen, relevant litteratur, for å reflektere rundt hvordan sikens utseende kan være påvirket av slektskap og tilpasninger til ... -
Small Changes in Gene Expression of Targeted Osmoregulatory Genes When Exposing Marine and Freshwater Threespine Stickleback (Gasterosteus aculeatus) to Abrupt Salinity Transfers
Taugbøl, Annette; Arntsen, Tina; Østbye, Kjartan; Vøllestad, Leif Asbjørn (Journal article; Peer reviewed, 2014)Salinity is one of the key factors that affects metabolism, survival and distribution of fish species, as all fish osmoregulate and euryhaline fish maintain osmotic differences between their extracellular fluid and either ... -
Spatio-temporal patterns in pelvic reduction in threespine stickleback (Gasterosteus aculeatus L.) in Lake Storvatnet
Klepaker, Tom; Østbye, Kjartan; Bernatchez, Louis; Vøllestad, L. Asbjørn (Peer reviewed; Journal article, 2012)Questions: The pelvic girdle with associated spines is an integrated anti-predator defence apparatus, and is assumed to protect against piscivores in the threespine stickleback. On the other hand, it might be costly to ... -
The temporal window of ecological adaptation in postglacial lakes: a comparison of head morphology, trophic position and habitat use in Norwegian threespine stickleback populations
Østbye, Kjartan; Harrod, Chris; Gregersen, Finn; Klepaker, Tom; Schulz, Michael; Schluter, Dolph; Vøllestad, Leif Asbjørn (Journal article; Peer reviewed, 2016)Background: Studying how trophic traits and niche use are related in natural populations is important in order to understand adaptation and specialization. Here, we des cribe trophic trait diversity in twenty-five ... -
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 ... -
Variation in Lateral Plate Quality in Threespine Stickleback from Fresh, Brackish and Marine Water: A Micro-Computed Tomography Study
Wiig, Elisabeth; Reseland, Janne E.; Østbye, Kjartan; Haugen, Håvard J.; Vøllestad, Leif Asbjørn (Journal article; Peer reviewed, 2016)Introduction It is important to understand the drivers leading to adaptive phenotypic diversity within and among species. The threespine stickleback (Gasterosteus aculeatus) has become a model system for investigating ...