Now showing items 1855-1874 of 1886

    • Water level fluctuations and the ecosystem functioning of lakes 

      Gownaris, Natasha J.; Rountos, Konstantine J.; Kaufman, Les; Kolding, Jeppe; Lwiza, Kamazima M.M.; Pikitch, Ellen K. (Peer reviewed; Journal article, 2018-08-28)
      Hydrological regimes are key drivers of productivity and structure in freshwater ecosystems but are increasingly impacted by human activity. Using 17 published food web models of 13 African lakes as a case study, we explored ...
    • Water masses constrain the distribution of deep-sea sponges in the North Atlantic Ocean and Nordic Seas 

      Roberts, E. M.; Bowers, D. G.; Meyer, H. K.; Samuelsen, Annette; Rapp, Hans Tore; Cardenas, P. (Journal article; Peer reviewed, 2021)
      Water masses are bodies of water with distinctive physical and biogeochemical properties. They impart vertical structure to the deep ocean, participate in circulation, and can be traced over great distances, potentially ...
    • Water temperature and dietary histidine affect cataract formation in Atlantic salmon (Salmo salar L.) diploid and triploid yearling smolt 

      Sambraus, Florian; Fjelldal, Per Gunnar; Remø, Sofie C.; Hevrøy, Ernst Morten; Nilsen, Tom Ole; Thorsen, Anders; Hansen, Tom Johnny; Waagbø, Rune (Peer reviewed; Journal article, 2017-09)
      The aim of the present study was to investigate cataract development in diploid (2N) and triploid (3N) Atlantic salmon smolts and post-smolts at two water temperatures (10 and 16 °C) given diets with different histidine ...
    • WEBnm@: a web application for normal mode analyses of proteins 

      Hollup, Siv Midtun; Sælensminde, Gisle; Reuter, Nathalie (Peer reviewed; Journal article, 2005-12-30)
      Background: Normal mode analysis (NMA) has become the method of choice to investigate the slowest motions in macromolecular systems. NMA is especially useful for large biomolecular assemblies, such as transmembrane channels ...
    • Weichselian vegetation and palaeoenvironment in western Norway and northern Russia. Evidence from pollen analytical investigations 

      Krüger, Linn Cecilie (Doctoral thesis, 2012-06-14)
      This thesis focuses on the vegetation history and environmental changes in western Norway and northern Russia during the last glacial period (the Weichselian). Pollen grains deposited in lakes and bogs are used as the main ...
    • What can selection experiments teach us about fisheries-induced evolution? 

      Diaz Pauli, Beatriz; Heino, Mikko Petteri (Peer reviewed; Journal article, 2014-03)
      There is evidence that fisheries are altering the phenotypic composition of fish populations, often in ways that may reduce the value of fish stocks for the exploiters. Despite the increasing number of theoretical and field ...
    • What Is Gill Health and What Is Its Role in Marine Finfish Aquaculture in the Face of a Changing Climate? 

      Foyle, Kevin L.; Hess, Sybille; Powell, Mark; Herbert, Neill A. (Journal article; Peer reviewed, 2020)
      It is hard to find a definition of gill health in the literature although there is a lot of information on changes to gill structure as a result of infectious and non-infectious challenge. How these changes relate to overall ...
    • What is natural? The importance of a long-term perspective in biodiversity conservation and management 

      Willis, Katherine Jane; Birks, Harry John Betteley (Peer reviewed; Journal article, 2006)
      Ecosystems change in response to factors such as climate variability, invasions, and wildfires. Most records used to assess such change are based on short-term ecological data or satellite imagery spanning only a few ...
    • What is the observed relationship between species richness and productivity? Comment 

      Whittaker, Robert J.; Heegaard, Einar (Journal article, 2003)
    • When to reproduce? A new answer to an old question 

      Skorping, Arne; Jensen, Knut Helge; Mennerat, Adele; Högstedt, Göran (Peer reviewed; Journal article, 2016-04)
      We present a life-history model based on the assumptions that juvenile survival follows a negative exponential function and that fecundity gain increases linearly with time to maturity. This model predicts that the optimal ...
    • Whole genome resequencing reveals diagnostic markers for investigating global migration and hybridization between minke whale species 

      Malde, Ketil; Seliussen, Bjørghild Breistein; Sanchez, Maria Quintela; Dahle, Geir; Besnier, Francois; Skaug, Hans J.; Øien, Nils Inge; Solvang, Hiroko Kato; Haug, Tore; Skern-Mauritzen, Rasmus; Kanda, Naohisa; Pastene, Luis A.; Jonassen, Inge; Glover, Kevin (Peer reviewed; Journal article, 2017-01-13)
      Background: In the marine environment, where there are few absolute physical barriers, contemporary contact between previously isolated species can occur across great distances, and in some cases, may be inter-oceanic. An ...
    • Wild and farmed salmon (Salmo salar) as reservoirs for infectious salmon anaemia virus, and the importance of horizontal- and vertical transmission 

      Nylund, Are; Brattespe, Jarle; Plarre, Heidrun; Kambestad, Martha Amalie; Karlsen, Marius (Peer reviewed; Journal article, 2019-04-16)
      The infectious salmon anaemia virus (ISAV) is an important pathogen on farmed salmon in Europe. The virus occurs as low- and high virulent variants where the former seem to be a continuous source of new high virulent ISAV. ...
    • Willow canopies and plant community structure along an alpine environmental gradient 

      Totland, Ørjan; Grytnes, John-Arvid; Heegaard, Einar (Peer reviewed; Journal article, 2005)
      We examined the impact of Salix lapponum canopies on plantcommunity structure in five sites along a climatic gradient in aglacier foreland in alpine south Norway. Species richness is lowerinside canopies compared to outside ...
    • Wind to insect pollination ratios and floral traits in five alpine Salix species 

      Totland, Ørjan; Peeters, Liza (Peer reviewed; Journal article, 1999)
      This study examines the ratio of wind to insect pollination of five alpine-arctic Salix species and possible correlations between plant traits and this ratio. The field work was done in an alpine area in southwest Norway, ...
    • Winning ways with hydrogen sulphide on the Namibian shelf 

      Currie, Bronwen; Utne-Palm, Anne Christine; Salvanes, Anne Gro Vea (Peer reviewed; Journal article, 2018-10-11)
      The shelf sediments off Namibia are some of the most unusual and extreme marine habitats because of their extremely high hydrogen sulphide concentrations. High surface productivity of the northern Benguela upwelling system ...
    • A winter-to-summer transition of bacterial and archaeal communities in Arctic sea ice 

      Thiele, Stefan; Storesund, Julia Endresen; Férnandez-Méndez, Mar; Assmy, Philipp; Øvreås, Lise (Journal article; Peer reviewed, 2022-08-15)
      The Arctic is warming 2–3 times faster than the global average, leading to a decrease in Arctic sea ice extent, thickness, and associated changes in sea ice structure. These changes impact sea ice habitat properties and ...
    • Winters are changing: snow effects on Arctic and alpine tundra ecosystems 

      Rixen, Christian; Høye, Toke Thomas; Macek, Petr; Aerts, Rien; Alatalo, Juha; Andeson, Jill; Arnold, Pieter; Barrio, Isabel C.; Bjerke, Jarle W.; Björkman, Mats P.; Blok, Daan; Blume-werry, Gesche; Boike, Julia; Bokhorst, Stef; Carbognani, Michele; Christiansen, Casper Tai; Convey, Peter; Cooper, Elisabeth J.; Cornelissen, J. Hans C.; Coulson, Stephen; Dorrepaal, Ellen; Elberling, Bo; Elmendorf, Sarah; Elphinstone, Cassandra; Forte, T'ai Gladys Whittingham; Frei, Esther R.; Geange, Sonya Rita; Gehrmann, Friederike; Gibson, Casey; Grogan, Paul; Rechsteiner, Aud Helen Halbritter; Harte, John; Henry, Greg H.R.; Inouye, David W.; Irwin, Rebecca; Jespersen, Gus; Jónsdóttir, Ingibjörg Svala; Jung, Ji Young; Klinges, David H.; Kudo, Gaku; Lämsä, Juho; Lee, Hanna; Lembrechts, Jonas; Lett, Signe; Lynn, Joshua Scott; Mann, Hjalte Mads; Mastepanov, Mikhail; Morse, Jennifer; Myers-Smith, Isla; Olofsson, Johan; Semenchuk, Philipp; Vandvik, Vigdis (Journal article; Peer reviewed, 2022)
      Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines ground temperature, light conditions and moisture availability during winter. It also affects the growing season’s start and ...
    • Winter−spring transition in the subarcticAtlantic: microbial response to deep mixingand pre-bloom production 

      Paulsen, Maria Lund; Riisgaard, Karen; Frede, Thingstad; St. John, Mike; Nielsen, Torkel Gissel (Peer reviewed; Journal article, 2015-09-23)
      In temperate, subpolar and polar marine systems, the classical perception is that diatoms initiate the spring bloom and thereby mark the beginning of the productive season. Contrary to this view, we document an active ...
    • Working and Learning in a Field Excursion 

      Hole, Torstein Nielsen (Peer reviewed; Journal article, 2018-06)
      This study aimed to discern sociocultural processes through which students learn in field excursions. To achieve this aim, short-term ethnographic techniques were employed to examine how undergraduate students work and ...
    • Wound healing in post-smolt Atlantic salmon (Salmo salar L.) 

      Sveen, Lene Rydal; Timmerhaus, Gerrit; Krasnov, Aleksei; Takle, Harald; Handeland, Sigurd; Ytteborg, Elisabeth (Peer reviewed; Journal article, 2019-03-05)
      Skin biopsies (5 mm) taken from behind the dorsal fin on Atlantic salmon post-smolts were followed over a 2 month period. The healing process was dominated by hemostasis, acute inflammation, and epidermal repair the first ...