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norskBlar i forfatter "Østbye, Kjartan"
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“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
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-24)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 <i>Salvelinus alpinus</i> L. is a polymorphic species with huge morphological and life‐history diversity in Holarctic water systems. We studied adaptive radiation of 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
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-25)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 Norway, the salmonid fish, Arctic charr (<i>Salvelinus alpinus</i> (L.)), has likely radiated within 9,700 years after deglaciation into ecologically and genetically segregated ... -
Diversifying selection drives parallel evolution of gill raker number and body size along the speciation continuum of European whitefish
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-02-05)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 ... -
Ecological speciation in postglacial European whitefish: rapid adaptive radiations into the littoral, pelagic, and profundal lake habitats
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)Understanding how a monophyletic lineage of a species diverges into several adaptive forms has received increased attention in recent years, but the underlying mechanisms in this process are still under debate. Postglacial fishes are excellent model organisms for exploring this process, especially the initial stages of ecological speciation, as postglacial lakes represent replicated discrete ... -
Fauna crime: elucidating the potential source and introduction history of European smelt (Osmerus eperlanus L.) into Lake Storsjøen, Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-01)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 its native habitat. Lake Storsjøen in South-Central Norway was recently found to have been subjected to an illegal translocation of the European smelt (Osmerus eperlanus). The ... -
Using mathematical modelling to investigate the adaptive divergence of whitefish in Fennoscandia
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-30)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 of general theoretical concepts and tools to specific ecological systems remains a challenge. Here we apply modeling tools to better understand adaptive divergence of whitefish ...
