Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Jan Heggenes"'
Publikováno v:
Evolutionary Applications, Vol 17, Iss 1, Pp n/a-n/a (2024)
Abstract 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 processes determ
Externí odkaz:
https://doaj.org/article/bc8ad737249443caa3f8458b1aee6731
Autor:
Lena Romtveit, Olav Strand, Anders Mossing, Leif Kastdalen, Arne W. Hjeltnes, Dag K. Bjerketvedt, Arvid Odland, Jan Heggenes
Publikováno v:
Ecology and Evolution, Vol 11, Iss 15, Pp 10409-10420 (2021)
Abstract Optimal foraging models predict that individual animals will optimize net energy gain by intensifying forage activity and/or reducing forage energy cost. Then, the free distribution model predicts an animal's distribution in a patchy landsca
Externí odkaz:
https://doaj.org/article/e1e26ec509dd4805805219c16f8b9686
Publikováno v:
Remote Sensing, Vol 14, Iss 20, p 5207 (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, combined with a scarcity of
Externí odkaz:
https://doaj.org/article/579f30dc4a914c499b7cd65a66f21c89
Publikováno v:
Rangifer, Vol 38, Iss 1 (2018)
Grazing and trampling by the wide-ranging wild tundra reindeer may have major top down landscape effects by causing vegetation changes. Grazing, as the collective effect of eating, trampling, defecation, and urination, has been studied extensively. I
Externí odkaz:
https://doaj.org/article/e6591cffdcd746fb9ccb80aed83ab87a
Autor:
Kjersti S Kvie, Jan Heggenes, David G Anderson, Marina V Kholodova, Taras Sipko, Ivan Mizin, Knut H Røed
Publikováno v:
PLoS ONE, Vol 11, Iss 11, p e0165237 (2016)
In light of current debates on global climate change it has become important to know more on how large, roaming species have responded to environmental change in the past. Using the highly variable mitochondrial control region, we revisit theories of
Externí odkaz:
https://doaj.org/article/4fe9684c344945018f300e823d1d13c0
Publikováno v:
Polar Biology
Herbivores may have extensive top-down effects in open grazing ecosystems, generating vegetation changes by grazing and trampling. Trampling effects are understudied, but may be a major ecological factor. In cold alpine-Arctic ecosystems grazing and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c31e0ad109c277b09c2fcc139c79ae31
https://doi.org/10.1007/s00300-020-02685-4
https://doi.org/10.1007/s00300-020-02685-4
Publikováno v:
Conservation Genetics
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 genetic diversity, and become
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dfa4e167997a23137b7db706a504cae9
https://doi.org/10.1007/s10592-020-01266-6
https://doi.org/10.1007/s10592-020-01266-6
Publikováno v:
Environmental Biology of Fishes. 101:1-21
Winter is an ecologically challenging season for ectothermic cold-water fish in natural streams because of reduced flow and freezing. Hydropower regulation in many northern rivers increase winter stream flow and temperatures, and reduce ice formation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c0650ad63b780c06edb451a82e5c4b6
https://doi.org/10.1007/s10641-017-0677-z
https://doi.org/10.1007/s10641-017-0677-z
Autor:
Ana Adeva-Bustos, John E. Brittain, Ari Huusko, Knut Alfredsen, Morten Stickler, Jan Heggenes
Publikováno v:
River research and applications
Rivers Research and Applications: an international journal devoted to river research and management
Rivers Research and Applications: an international journal devoted to river research and management
Water temperatures control life histories and diversity of aquatic species. Hydropower regulation, particularly in high head systems, alters natural water temperature regimes, which may have profound and long-term impacts on aquatic environments. Tem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f742e64cff155d0e35975b660892f496
https://hdl.handle.net/11250/2734381
https://hdl.handle.net/11250/2734381
Publikováno v:
Hydrobiologia. 785:261-275
An experimental factorial approach, in terms of habitat use and movements by Atlantic salmon parr (Salmo salar), was studied in response to induced peaking flow in a bypass river section in southern Norway. Sixteen radio-tagged salmon parr (mean TL 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::114d2335799f59c40be06cb7fc6bc832
https://doi.org/10.1007/s10750-016-2931-3
https://doi.org/10.1007/s10750-016-2931-3