Blar i Articles på forfatter "Krafft, Bjørn A."
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Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean
Krafft, Bjørn A.; Skaret, Georg; Knutsen, Tor; Melle, Webjørn; Klevjer, Thor A.; Søiland, Henrik (Journal article; Peer reviewed, 2012-09-28)Knowledge about swarm dynamics and underlying causes is essential to understand the ecology and distribution of Antarctic krill Euphausia superba. We collected acoustic data and key environmental data continuously across ... -
Distribution of sex and age groups of ringed seals Pusa hispida in the fast-ice breeding habitat of Kongsfjorden, Svalbard
Krafft, Bjørn A.; Kovacs, Kit M.; Lydersen, Christian (Journal article; Peer reviewed, 2007-04-16)Spatial distribution of various age- and sex groups of ringed seals (N = 94; 19 adult males, 33 adult females and 42 subadults) was studied in their fast-ice breeding habitat in Kongsfjorden, Svalbard, during May 2004. ... -
Impact of climate change on Antarctic krill
Flores, Humberto; Atkinson, A.; Kawaguchi, So; Krafft, Bjørn A.; Milinevsky, Gennadi; Nicol, Stewart; Reiss, Christian; Tarling, Geraint Andrew; Werner, R.; Rebolledo, E. Bravo; Cirelli, V.; Cuzin-Roudy, J.; Fielding, Sophie; Groeneveld, J.J.; Haraldsson, Matilda; Lombana, Alfonso V.; Marschoff, Enrique R.; Meyer, Bettina; Pakhomov, Evgeny A.; Rombola, Emilce; Schmidt, Katrin; Siegel, Volker; Teschke, Mathias; Tonkes, Henrieke; Toullec, Jean-Yves; Trathan, Philip N.; Tremblay, Nelly; Van de Putte, Anton Pieter; van Franeker, Jan Andries; Werner, Thorsten (Journal article; Peer reviewed, 2012-07-03)Antarctic krill Euphausia superba (hereafter ‘krill’) occur in regions undergoing rapid environmental change, particularly loss of winter sea ice. During recent years, harvesting of krill has in - creased, possibly ... -
Prey selection of offshore killer whales Orcinus orca in the Northeast Atlantic in late summer: spatial associations with mackerel
Nøttestad, Leif; Sivle, Lise Doksæter; Krafft, Bjørn A.; Langård, Lise; Anthonypillai, Valantine; Bernasconi, Matteo; Langøy, Herdis; Fernö, Anders (Journal article; Peer reviewed, 2014-03-03)The traditional perception of prey species preference of killer whales Orcinus orca L. in the Northeast Atlantic has, to a large extent, been linked to herring Clupea harengus L. Few studies have investigated the feeding ... -
Size Selection of Antarctic Krill (Euphausia superba) in Trawls
Krag, Ludvig A.; Herrmann, Bent; Iversen, Svein A.; Engås, Arill; Nordrum, Sigve; Krafft, Bjørn A. (Journal article; Peer reviewed, 2014-08-08)Trawlers involved in the Antarctic krill (Euphausia superba) fishery use different trawl designs, and very little is known about the size selectivity of the various gears. Size selectivity quantifies a given trawl’s ability ... -
Time budgets and at-sea behaviour of lactating female Antarctic fur seals Arctocephalus gazella at Bouvetøya
Biuw, Martin; Krafft, Bjørn A.; Hofmeyr, G.J. Greg; Lydersen, Christian; Kovacs, Kit M. (Journal article; Peer reviewed, 2009-06-18)We present the first data on attendance patterns, at-sea movements and diving behaviour of Antarctic fur seals breeding at Bouvetøya (Bouvet Island), Southern Ocean. While other colonies have been extensively studied, this ...