Blar i NINA Brage på forfatter "Hessen, Dag Olav"
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Assessing climatic and spatial variables influencing zooplankton richness for space-for-time predictions
Heuschele, Jan David; Andersen, Tom; Walseng, Bjørn; Hessen, Dag Olav (Peer reviewed; Journal article, 2023)1. The macroecological drivers of freshwater diversity are accredited geographical, spatial and climatic variables, but also to productivity, ecosystem age and landscape history. Locally diversity is also influenced ... -
Changes in trophic state and aquatic communities in high Arctic ponds in response to increasing goose populations
Jensen, Thomas Correll; Walseng, Bjørn; Hessen, Dag Olav; Dimante-Deimantovica, Inta; Novichkova, Anna; Chertoprud, Elena S.; Chertoprud, Mikhail V.; Sakharova, Ekaterina G.; Krylov, Aleksandr V.; Frisch, Dagmar; Christoffersen, Kirsten Seestern (Peer reviewed; Journal article, 2019)1. The high Arctic, including the Svalbard archipelago in the North Atlantic, has been exposed to direct and indirect drivers of climatic change such as rising temperatures and associated changes in hydrology and nutrient ... -
Do DOM quality and origin affect the uptake and accumulation of lipid-soluble contaminants in coastal filter feeders? An experimental simulation of teflubenzuron exposure to blue mussels
Schultze, Sabrina; Andersen, Tom; Knudtzon, Nina Cathrine; Ruus, Anders; Rundberget, Jan Thomas; Brooks, Steven; Poste, Amanda Elizabeth; Hessen, Dag Olav; Borgå, Katrine (Peer reviewed; Journal article, 2023)The increased export of terrestrial dissolved organic matter (terrDOM) to coastal marine ecosystems may affect local filter feeders and the local food web via the altered uptake of organic material and associated contaminants. ... -
Global change and ecosystem connectivity: how geese link fields of central Europe to eutrophication of Arctic freshwaters
Hessen, Dag Olav; Tombre, Ingunn; van Geest, Gerben; Alfsnes, Kristian (Journal article; Peer reviewed, 2016)Migratory connectivity by birds may mutually affect different ecosystems over large distances. Populations of geese overwintering in southern areas while breeding in high-latitude ecosystems have increased strongly ... -
Islands of ice: Glacier-dwelling metazoans form regionally distinct populations despite extensive periods of deglaciation
Janko, Karel; Shain, Daniel H.; Fontaneto, Diego; Doležálková, Marie Kaštánková; Buda, Jakub; Kašparová, Eva Štefková; Šabacká, Marie; Rosvold, Jørgen; Stefaniak, Jacek; Hessen, Dag Olav; Devetter, Miloslav; Jimenez Santos, Marco Antonio; Horna, Patrik; Drdová, Edita Janková; Yde, Jacob C.; Zawierucha, Krzysztof (Peer reviewed; Journal article, 2024)Aim: Glaciers cover considerable portion of land and host diverse life forms fromsingle-celled organisms to invertebrates. However, the determinants of diversityand community composition of these organisms remain underexplored. ... -
Long-term annual and spatial variation of polygyny in the white-throated dipper (Cinclus cinclus)
Walseng, Bjørn; Durant, Joël; Hessen, Dag Olav; Jerstad, Kurt; Nilsson, Anna; Røstad, Ole Wiggo; Slagsvold, Tore (Peer reviewed; Journal article, 2022)Mating strategies are key components in the fitness of organisms, and notably in birds the occurrence of monogamy versus polygyny has attracted wide interest. We address this by a very comprehensive dataset (2899 breeding ...