Now showing items 401-420 of 2086

    • Beyond Catching Fish: Exploring the role of Relational Values in Mobilizing Community-based Management Efforts in a north Norwegian lake 

      Mæland, Kjerstin Andrea (Master thesis; Mastergradsoppgave, 2023-05-15)
      All over the world, local communities are actively engaging in the management and monitoring of natural resources. The underlying driver of most community-driven efforts goes beyond the direct utilization of natural resources to entail a deeper relation to the place or ecosystem they are managing. Relational values have been suggested as a potential driver of such initiatives, but empirical research ...
    • Size composition, reproductive investment, and fecundity of red king crab (Paralithodes camtschaticus) in Finnmark fjords, 1994-2022 

      Hjertaas, Haakon Winge (Master thesis; Mastergradsoppgave, 2023-05-15)
      The release of red king crab (Paralithodes camtschaticus) into the Barents Sea by Russian scientists in the 1960s had the goal of establishing a self-sustaining stock for the purpose of commercial harvest. The red king crab has been successfully established as a stock in Norwegian waters where it has become an important commercial resource in the eastern regions of Finnmark. The Norwegian red king ...
    • High seasonal overlap in habitat suitability in a nonmigratory High Arctic ungulate 

      Pedersen, Åshild Ønvik; Soininen, Eeva M; Hansen, Brage Bremset; Le Moullec, Mathilde; Loe, Leif Egil; Paulsen, I.M.G.; Eischeid, Isabell; Karlsen, Stein Rune; Ropstad, Erik; Stien, Audun; Tarroux, Arnaud; Tømmervik, Hans; Ravolainen, Virve (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-26)
      Understanding drivers of space use and habitat selection is essential for management and conservation, especially under rapid environmental change. Here, we develop summer and winter habitat suitability models for the endemic wild Svalbard reindeer (Rangifer tarandus platyrhynchus). The High Arctic Svalbard tundra is currently subject to the fastest temperature increases on Earth, and reindeer ...
    • Northern expansion is not compensating for southern declines in North American boreal forests 

      Rotbarth, Ronny; Van Nes, Egbert H.; Scheffer, Marten; Jepsen, Jane Uhd; Vindstad, Ole Petter Laksforsmo; Xu, Chi; Holmgren, Milena (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-08)
      Climate change is expected to shift the boreal biome northward through expansion at the northern and contraction at the southern boundary respectively. However, biome-scale evidence of such a shift is rare. Here, we used remotely-sensed tree cover data to quantify temporal changes across theNorth American boreal biome from 2000 to . 2019. We reveal a strong northsouth asymmetry in tree cover change, ...
    • Increased importance of cool-water fish at high latitudes emerges from individual-level responses to warming 

      Smalås, Aslak; Primicerio, Raul; Kahilainen, Kimmo K.; Terentjev, Petr; Kashulin, Nikolay; Zubova, Elena; Amundsen, Per-Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-06)
      High latitude ecosystems are experiencing the most rapid warming on earth, expected to trigger a diverse array of ecological responses. Climate warming affects the ecophysiology of fish, and fish close to the cold end of their thermal distribution are expected to increase somatic growth from increased temperatures and a prolonged growth season, which in turn affects maturation schedules, reproduction, ...
    • Estimating the cumulative impact and zone of influence of anthropogenic features on biodiversity 

      Niebuhr, Bernardo Brandão; Van Moorter, Bram; Stien, Audun; Tveraa, Torkild; Strand, Olav; Langeland, Knut; Sandstrom, Per; Alam, Moudud; Skarin, Anna; Panzacchi, Manuela (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-02)
      1. The concept of cumulative impacts is widespread in policy documents, regu-lations and ecological studies, but quantification methods are still evolving. Infrastructure development usually takes place in landscapes with preexist-ing anthropogenic features. Typically, their impact is determined by computing the distance to the nearest feature only, thus ignoring the potential cumulative impacts of ...
    • Morphological variation in the redfish (Sebastes spp.) complex in Norwegian waters 

      Bruvold, Ingrid Marie (Master thesis; Mastergradsoppgave, 2021-06-02)
      The golden redfish Sebastes norvegicus is a long-lived commercial species of redfish in the North Atlantic. Excessive harvest through decades has led to a decline in the mature population in Norwegian waters, which is currently considered to be severely depleted. Accumulating genetic evidence suggest a more complex structure within the Sebastes genus in the North Atlantic, which has recently formed ...
    • Inflammatory responses in lumpfish (Cyclopterus lumpus L.) vaccinated at different water temperatures with intraperitoneal injection 

      Knutsen, Ingrid Svihus (Master thesis; Mastergradsoppgave, 2021-05-18)
      The use of lumpfish (Cyclopterus lumpus L.) as cleaner fish in salmonid aquaculture for the biological control of sea lice infestation levels has increased in recent years. The species is relatively new to aquaculture and susceptible to various infectious agents. The health situation for lumpfish is currently considered poor, indicating the necessity for developing more efficient vaccines. Studying ...
    • Plastic occurrence in six different species of Arctic seabirds - Harmonizing methods and closing knowledge gaps on plastic occurrence and polymer identity 

      Benjaminsen, Stine Charlotte (Master thesis; Mastergradsoppgave, 2021-05-18)
      The once pristine Arctic is now facing negative alterations with a rapidly changing climate, increasing human activity, and plastic pollution. Seabirds are intrinsic to the marine ecosystems, and in recent years, plastic ingestion by seabirds has been of increasing concern because of the potential negative impact on individual and population levels. The aim of this study was to investigate the plastic ...
    • Snow depth effects on vegetation dynamics and development of near-remote sensing techniques in high-Arctic tundra 

      Jørgensen, Andreas (Master thesis; Mastergradsoppgave, 2022-05-16)
      Snow exerts key controls on many aspects of plant ecology in the Arctic, including community composition. With climate predictions forecasting dramatic changes in winter climate and snow cover in the Arctic in the near future, it is important to improve our understanding of snow effects on plant communities in these regions. This study used a snow depth manipulation experiment established in 2006 ...
    • Timing is everything: Within-plant flowering phenology impacts fruit production in the Arctic-Alpine cushion plant Silene acaulis (L.) Jacq. 

      Ween, Rebekka Eriksen (Master thesis; Mastergradsoppgave, 2022-05-16)
      Timing is everything for Arctic flowering plants. Early flowers might be destroyed by frost, while late flowers have less time and resources to mature fruit. With climate change, Arctic flowering phenology is shifting. Yet for many species, phenology studies only encompass the onset of flowering and lack baseline data on within-plant flowering times. I used the gynodioecious cushion plant Silene ...
    • Effect of simulated disturbance by geese on soil temperature and active layer thickness over one growing season 

      Holm, Hildur Søndergaard (Master thesis; Mastergradsoppgave, 2022-05-13)
      The Arctic is an area predicted to be strongly affected by climate change, and the extent of permafrost is expected to decrease. The insulating capacity of bryophytes is central in permafrost preservation. In High-Arctic Svalbard, disturbance by geese through grubbing may damage and remove parts of the bryophyte layer in moss tundra. The disruption is expected to lead to increased soil temperatures ...
    • Effect of ripening temperature on the chemical composition of lingonberries (Vaccinium vitis-idaea L.) of northern and southern origin 

      Amundsen, M.; Jaakola, Laura; Aaby, Kjersti; Martinussen, Inger; Kelanne, N.; Tuominen, S.; Laaksonen, O.; Yang, B.; Hykkerud, Anne Linn (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-21)
      Lingonberries (Vaccinium vitis-idaea L.) from two locations, northern (69◦N, 18◦E) and southern (59◦N, 10◦E) Norway, were grown under controlled conditions in a phytotron at two temperatures (9 and 15 ◦C) to study the effects of the ripening temperature and origin on the chemical composition of the berries. The concentrations of phenolic compounds, sugars, and organic acids as well as the profile ...
    • Marine food consumption by adult Atlantic salmon and energetic impacts of increased ocean temperatures caused by climate change 

      Strøm, John Fredrik; Ugedal, Ola; Rikardsen, Audun H.; Thorstad, Eva Bonsak (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-27)
      Atlantic salmon Salmo salar are experiencing widespread population declines, and reductions in growth and survival in the marine environment are contributing factors. Our aims were to estimate marine food consumption of adult salmon and to determine how energetics would be directly afected by the increased ocean temperatures associated with climate change. We tagged previous spawners on outward ...
    • A practical implication of the Astolfo Effect: bias in AI generated images 

      Salvador, Rodrigo Brincalepe; Soares, Henrique M.; Tomotani, João V. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023)
      The year of 2022 saw a huge advance in AI technology, especially Large Language Models, or LLMs. This culminated in the release of Chat GPT, an AI Chatbot assistant that, as of the time of this writing, is wowing the public with its uncanny performance.<p> <p>However, chatbots are not the only application of LLMs. One such application is the artificial generation of images. Although such idea is ...
    • Effects of the invasive aquatic snail Potamopyrgus antipodarum (Gray, 1853) on ecosystem properties and services 

      Alonso, A.; Collado, Gonzalo A.; Gerard, C.; Levri, E.P.; Salvador, Rodrigo Brincalepe; Castro-Díez, P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-17)
      Ecosystems provide benefits to humans, including provisioning, regulating, and cultural services. However, invasive species can threaten ecosystem well-functioning and services provided. One invasive species with such potential is the New Zealand mud snail (NZMS) Potamopyrgus antipodarum. The aims of this study are focused on the quantitative review of (1) the NZMS impacts on ecosystem properties ...
    • A new species of Megalobulimus from the early Holocene of southeastern Brazil (Gastropoda, Strophocheilidae) 

      Fontenelle, José Heitzmann; Salvador, Rodrigo Brincalepe (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-23)
      A new species of megasnail, Megalobulimus diluvianus sp. nov., is herein described based on subfossil material from limestone caves in the area of Lagoa Santa, Minas Gerais state, southeastern Brazil. The specimens come from a context of archaeological strata of early Holocene age. Considering the morphological features of the shell, the new species seems closely allied to the so-called ...
    • Augustus Hamilton’s fossil collection at the Museum of New Zealand Te Papa Tongarewa 

      Ioane-Warren, Melanie; Salvador, Rodrigo Brincalepe; Rogers, Karyne M.; Tennyson, Alan J. D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-07)
      Augustus Hamilton (1853–1913) was a New Zealand ethnologist and naturalist who amassed a significant collection of fossils, mostly of birds, during his career. Today, those fossils are housed in the Museum of New Zealand Te Papa Tongarewa (NMNZ). While some fossils have been catalogued and integrated into the collection of the NMNZ, a large part remained unsorted and uncatalogued. The present study ...
    • Taxonomic study on a collection of terrestrial and freshwater gastropods from caves in Bahia state, Brazil, with the description of a new species 

      Salvador, Rodrigo Brincalepe; Silva, Fernanda Santos; Bichuette, Maria Elina (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-28)
      Gastropod samples were collected during expeditions to caves in Bahia state, northeastern Brazil, and are studied herein. Collection took place over the past five years, and gastropods were found in 14 caves distributed across six different municipalities: Campo Formoso, Carinhanha, Coribe, Feira da Mata, Central, and Ituaçu. A total of 19 species-level taxa of terrestrial and freshwater gastropods ...
    • A new giant petrel (Macronectes, Aves: Procellariidae) from the Pliocene of Taranaki, New Zealand 

      Tennyson, Alan J. D.; Salvador, Rodrigo Brincalepe (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-30)
      A new species of giant petrel, Macronectes tinae sp. nov., is described from the Pliocene deposits of South Taranaki, New Zealand. The holotype is a near complete skull and the paratype a fragmentary left humerus; both come from the Tangahoe Formation, dating from the late Pliocene (Piacenzian or “Waipipian”; age estimated as ca. 3.36–3.06 Ma). The new species of giant petrel is the first fossil ...