Now showing items 142-161 of 228

    • Ocean climate and egg investment in the black-legged kittiwake Rissa tridactyla. 

      Barrett, Robert T.; Erikstad, Kjell E.; Reiertsen, Tone (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-14)
      Birds allocate substantial resources to their eggs during the laying period, resources also needed for other concurrent costly processes such as mate acquisition, nest building and site defence. Egg and clutch sizes may thus vary in response to food availability prior to egg laying. We investigated the variation in egg and clutch size of black-legged kittiwakes Rissa tridactyla in a North Norwegian ...
    • On a new species of Amphilochus from deep and cold Atlanic waters, with a note on the genus Amphilochopsis (Amphipoda, Gammaridea, Amphilochidae) 

      Tandberg, Anne Helene S.; Vader, Wim (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-23)
      <i>Amphilochus manudens</i> and <i>Amphilochopsis hamatus</i> are redescribed based on specimens from the BioIce, Mareano, and IceAGE programmes. Te new species <i>Amphilochus anoculus</i> <b>sp. n.</b> is described based on material from the IceAGE programme and the preceding BioIce programme; it is separated from the closely related <i>Amphilochus manudens</i> by the absence of eyes, a ...
    • On the polar edge: the status of the northern gannet (Morus bassanus) in the Barents Sea in 2015-2016. 

      Barrett, Robert T.; Strøm, H.; Melnikov, Mikhail (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-27)
      During its population recovery in the North Atlantic in the early 1900s, the northern gannet (Morus bassanus) established its first colony in Norway at Runde in 1946. Since the 1960s, gannets have established (and later abandoned) several small colonies in the north of the country. These colonies have been regularly monitored, and in 2015–16 ca. 3300 apparently occupied nests (AON) were counted ...
    • Optimal foraging in chick-raising Common Guillemots (Uria aalge) 

      Bugge, Julie; Barrett, Robert T.; Pedersen, Torstein (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      The Norwegian population of the Common Guillemot Uria aalge has declined by > 95% since the 1960s, and is classified as critically endangered in the Norwegian Red List. Much of the recent decline has been attributed to reduced food availability, but without extensive documentation of adult diet. Instead, chick diet has been considered a proxy of adult diet during the breeding season in many Norwegian ...
    • Orthopoxvirus DNA in Eurasian Lynx, Sweden 

      Tryland, Morten; Okeke, Malachy Ifeanyi; Hård af Segerstad, Carl; Mörner, Torsten; Traavik, Ingemar Terje; Ryser-Degiorgis, Marie-Pierre (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      Cowpox virus, which has been used to protect humans against smallpox but may cause severe disease in immunocompromised persons, has reemerged in humans, domestic cats, and other animal species in Europe. Orthopoxvirus (OPV) DNA was detected in tissues (lung, kidney, spleen) in 24 (9%) of 263 free-ranging Eurasian lynx (Lynx lynx) from Sweden. Thymidine kinase gene amplicon sequences (339 bp) from ...
    • Otolitter fra saltvannsfisker i Nord-Norge 

      Breiby, Anne (Research report; Forskningsrapport, 1985)
      Drawings and descriptions of otloiths from 29 common marine fish species fron North Norway is presented. For 12 species the relationship between fish standard lenhgt and otolith lenghts is described by linear regression.
    • Paleoekolgiska undersökningar i samband med utvidgelse av E8 i Lavangsdalen 

      Sjøgren, Per Johan E (Research report; Forskningsrapport, 2013)
      Inför utvidgelsen av E8 i Lavangsdalen identifierades två fredade samiska kulturminneslokaliteter (Sametinget 2011) vilka delvis eller helt skulle förstöras i samband med utbyggningen och krävde vidare undersökningar. Det rörde sig om kulturspår från samisk renskötsel vilket i första hand gav sig uttryck som förändringar i dagens vegetation. För att få en förståelse av hur långt tillbaka i tiden den ...
    • Pannaria pyxinoides comb. nov., an overlooked lichen from Northern New Zealand 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel, 2018-07)
      The name <i>Psoroma pyxinoides</i>, which has been considered to be a synonym of <i>Pannaria sphinctrina</i>, is shown here to represent a distinct species, differing from <i>P. sphinctrina</i> by thallus characters and in spore and pycnidium morphology. Those characters indicate a relationship with <i>Pannaria allorhiza</i>. Like the latter species, <i>P. pyxinoides</i> is endemic to northern New ...
    • Past Arctic aliens have passed away, current ones may stay 

      Alsos, Inger Greve; Ware, Christopher; Elven, Reidar (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-07-04)
      Increased human activity and climate change are expected to increase the numbers and impact of alien species in the Arctic, but knowledge of alien species is poor in most Arctic regions. Through field investigations over the last 10 years, and review of alien vascular plant records for the high Arctic Archipelago Svalbard over the past 130 years, we explored long term trends in persistence and ...
    • Pestplanten tromsøsvineblom Jacobaea alpina x subalpina i Norge - opphav og status 

      Alm, Torbjørn; Deschamps, Amandine Maria; Often, Anders (Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
      Jacobaea alpina (syn. Senecio alpinus, S. cordatus ) and J. subalpina (syn. Senecio subalpinus ) are native to the mountains of Central Europe. Both were cultivated as ornamentals in late 19th century Tromsø. From the early 1990’s onwards, numerous Jacobaea stands have been noticed outside gardens, in particular at Tromsø, but extending from Lenvik in central Troms northwards ...
    • Plant DNA in sediments: to which degree do they represent the flora? 

      Alsos, Inger Greve; Coissac, Eric; Edwards, Mary E.; Merkel, Marie Kristine Føreid; Gielly, Ludovic; Sjögren, Per; Taberlet, Pierre; Yoccoz, Nigel Gilles (Conference object; Konferansebidrag, 2015-05)
    • Plant DNA metabarcoding of lake sediments: How does it represent the contemporary vegetation 

      Alsos, Inger Greve; Lammers, Youri; Yoccoz, Nigel Gilles; Jørgensen, Tina; Sjögren, Per; Gielly, Ludovic; Edwards, Mary E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-17)
      Metabarcoding of lake sediments have been shown to reveal current and past biodiversity, but little is known about the degree to which taxa growing in the vegetation are represented in environmental DNA (eDNA) records. We analysed composition of lake and catchment vegetation and vascular plant eDNA at 11 lakes in northern Norway. Out of 489 records of taxa growing within 2 m from the lake shore, ...
    • Plant species introduced by foreigners according to folk tradition in Norway and some other European countries: Xenophobic tales or not? 

      Alm, Torbjørn (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-05)
      Background In their quest to understand and interpret nature, people have frequently sought religious or divine origins for plant species and their characteristics. Less often, historical events or persons are involved. This study comprises eleven cases of the latter kind, all claiming that plant species have been introduced by foreigners or at least from foreign lands. Methods Based on literature ...
    • Polare maskuliniteter 

      Hauan, Marit Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      In this paper my aim is to read and understand the journal of Gerrit de Veer from the last journey of William Barents to the Arctic Regions in 1596 and the journal of captain Junge on his hunting trip from Tromsø to Svalbard in 1834.It is nearly 240 years between this to voyages. The first journal is known as the earliest report from the arctic era. Gerrit de Veer adds instructive copper engravings ...
    • Population genomics of Mesolithic Scandinavia: Investigating early postglacial migration routes and high-latitude adaptation 

      Günther, Torsten; Malmström, Helena; Svensson, Emma M.; Omrak, Ayça; Sánchez-Quinto, Frederico; Kılınç, Gülşah M.; Krzewinska, Maja; Eriksson, Gunilla; Fraser, Magdalena; Edlund, Hanna; Munteres, Arielle R.; Coutinho, Alexandra; Simões, Luciana G.; Vicente, Mário; Sjölander, Anders; Sellevold, Berit J.; Jørgensen, Roger; Claes, Peter; Shriver, Mark D.; Valdiosera, Cristina; Netea, Mihai G.; Apel, Jan; Lidén, Kerstin Birgitta; Skar, Birgitte; Storå, Jan; Götherström, Anders; Jakobsson, Mattias (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-09)
      Scandinavia was one of the last geographic areas in Europe to become habitable for humans after the Last Glacial Maximum (LGM). However, the routes and genetic composition of these postglacial migrants remain unclear. We sequenced the genomes, up to 57× coverage, of seven hunter-gatherers excavated across Scandinavia and dated from 9,500–6,000 years before present (BP). Surprisingly, among the ...
    • The potential of shoreline and shallow submerged Iron Age and Medieval archaeological sites in the Lofoten Islands, northern Norway 

      Wickler, Stephen (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      The Lofoten-Vesterålen archipelago (67°30’ - 69°30’N) is a chain of mountainous islands dissected by cirques, glacial valleys, and fjords that extends from northeast to southwest into the Norwegian Sea (Figure 1). Vesterålen is the northerly chain of islands and the seven islands of Lofoten lie to the south. The climate of Lofoten is mild despite this high latitude location. Temperatures ...
    • Prevailing weather conditions and diet composition affect chick growth and survival in the black-legged kittiwake 

      Christensen-Dalsgaard, Signe; May, Roel F.; Barrett, Robert T.; Langset, Magdalene; Sandercock, Brett K.; Lorentsen, Svein-Håkon (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-04)
      To identify priorities for management of seabirds during the breeding season, it is important to understand the ecological mechanisms driving chick growth and survival. In this study, we examined the effects of diet and prevailing weather on the growth and survival of chicks of black-legged kittiwakes Rissa tridactyla over a 10 yr period at Anda, a seabird colony in northern Norway. We show that ...
    • Prevention of microbial species introductions to the arctic: The efficacy of footwear disinfection measures on cruise ships 

      Rumpf, Sabine Bettina; Alsos, Inger Greve; Ware, Christopher (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-06)
      Biosecurity measures are commonly used to prevent the introduction of non-native species to natural environments globally, yet the efficacy of practices is rarely tested under operational conditions. A voluntary biosecurity measure was trialled in the Norwegian high Arctic following concern that non-native species might be transferred to the region on the footwear of travellers. Passengers aboard ...
    • Prey density in non-breeding areas affects adult survival of black-legged kittiwakes Rissa tridactyla 

      Reiertsen, Tone K.; Erikstad, Kjell E.; Anker-Nilssen, Tycho; Barrett, Robert T.; Boulinier, Thierry; Frederiksen, Morten; González-Solís, Jacob; Grémillet, David; Johns, David; Moe, Børge; Ponchon, Aurore; Skern-Mauritzen, Mette; Sandvik, Hanno; Yoccoz, Nigel Gilles (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-08-27)
      In migratory birds, environmental conditions in both breeding and non-breeding areas may affect adult survival rates and hence be significant drivers of demographic processes. In seabirds, poor knowledge of their true distribution outside the breeding season, however, has severely limited such studies. This study explored how annual adult survival rates of black-legged kittiwakes Rissa tridactyla ...