Institutt for arktisk og marin biologi: Recent submissions
Now showing items 361-380 of 2040
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Morphological variation in the redfish (Sebastes spp.) complex in Norwegian waters
(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
(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
(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
(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.
(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
(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
(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
(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
(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
(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)
(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
(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
(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
(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 ... -
South American terrestrial Gastropoda in the collection of the Auckland War Memorial Museum
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-10)The catalogued collection of South American terrestrial gastropods, including the Caribbean ABC islands and Trinidad & Tobago, of the Auckland War Memorial Museum (AM), New Zealand, is discussed here. In total, 264 specimen lots from South America were found in the AM collection, including eight type lots. Twelve of the specimens represent new geographic distribution data, including the first ... -
Socio-environmental impacts of non-native and transplanted aquatic mollusc species in South America. What do we really know?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-15)The impacts of biological invasions remain poorly known for some habitats, regions and taxa. To date, there has been no comprehensive effort to review and synthesize the impacts of invasive mollusc species in South America. In this paper, we provide a synoptic view on what is known on documented socio-ecological impacts of aquatic no-native mollusc species (NNMS) and transplanted mollusc species ... -
Arctic terrestrial biodiversity status and trends: A synopsis of science supporting the CBMP State of Arctic Terrestrial Biodiversity Report
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-18)This review provides a synopsis of the main findings of individual papers in the special issue <i>Terrestrial Biodiversity in a Rapidly Changing Arctic</i>. The special issue was developed to inform the <i>State of the Arctic Terrestrial Biodiversity Report</i> developed by the Circumpolar Biodiversity Monitoring Program (CBMP) of the Conservation of Arctic Flora and Fauna (CAFF), Arctic Council ... -
Spatiotemporal distribution and co-occurrence of Arctic herbivores in spring
(Master thesis; Mastergradsoppgave, 2022-04-19)Biotic interactions play an important role in the structure and dynamics of food-webs and may drive the spatial distribution of species. In the Arctic, spring snow-cover limits the availability of resources at a critical time for resident and migratory herbivores, which could lead to resource competition. This study takes a first step towards understanding the potential for competition between the ... -
Establishment of killer whale (Orcinus orca) primary fibroblast cell cultures and their transcriptomic responses to pollutant exposure
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-02)Populations of killer whale (Orcinus orca) contain some of the most polluted animals on Earth. Yet, the knowledge on effects of chemical pollutants is limited in this species. Cell cultures and in vitro exposure experiments are pertinent tools to study effects of pollutants in free-ranging marine mammals. To investigate transcriptional responses to pollutants in killer whale cells, we collected skin ... -
Life-cycle analysis of an endangered migratory goose to assess the impact ofconservation actions on population recovery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)Evaluating the effectiveness of conservation actions is challenging for migratory species because a population can be impacted anywhere along its route. Conservation actions for the critically endangered Fennoscandian lesser white-fronted goose population include culling of red foxes in the breeding area and habitat improvements and reduction of illegal hunting in the non-breeding areas. One goal ...