Blar i Brage IMR på forfatter "Christensen, Ivar"
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A review of the distribution, migrations, food, reproduction, exploitation and present abundance of humpback whales (Megatera novaeangliae) in the northeast Atlantic
Christensen, Ivar; Haug, Tore; Øien, Nils (ICES CM Documents;1990/N:10, Working paper, 1990)Most available knowledge about northeast Atlantic humpback whales (Megaptera novaeangliae) is based on information and experience gained during the pioneer period of modern whaling in Norwegian waters in 1868-1904 when ... -
Changes in blood testosterone and progesterone concentrations of the North Atlantic minke whale (Balaenoptera acutorostrata) during the feeding season
Kjeld, Matthías; Alfredsson, Árni; Ólafsson, Örn; Tryland, Morten; Christensen, Ivar; Stuen, Snorre; Árnason, Alfred (Journal article; Peer reviewed, 2004)An opportunity to study seasonal changes of sex hormones in the North Atlantic minke whale (common minke whale, Balaenoptera acutorostrata) arose when we obtained access to fresh postmortem blood samples from 104 females ... -
Current problems and research related to interactions between marine mammals and fisheries in Norwegian coastal and adjacent waters
Bjørge, Arne; Christensen, Ivar; Øritsland, Torger (ICES CM documents, Working paper, 1981)Current research and provisional results on the food items and feeding rates of killer whales, minke whales, grey seals, common seals and harp seals are presented. Commercial fish species constitute the major part of the ... -
Field work on bottle-nose whales in the Labrador Sea
Christensen, Ivar (ICES CM Documents;1971/N:12, Working paper, 1971) -
First record of gooseneck barnacles (Conchoderma auritum) on a minke whale (Balaenoptera acutorostrata)
Christensen, Ivar (ICES CM Documents;1985/N:9, Working paper, 1985)Clusters of a stalked barnacle, readily identified as Conchoderma auritum, were found attached to both damaged and complete baleen plates of a male minke whale caught off the coast of East Greenland on 16 July 1984. No ... -
Merking, observasjoner og atferdsstudier av hval i Barentshavet og ved Svalbard i 1974 og 1975 ;
Benjaminsen, Terje; Berlund, Jørgen; Christensen, Dag; Christensen, Ivar; Huse, Ingvar; Sandnes, Otto (Fisken og havet, Research report, 1976)In 1974 and 1975 a total of 188 minke whales (Balaenoptera acutorostrata)and 14 humpback whales (Megaptera novaeangliae) have been marked in the Barents Sea and at Svalbard. In addition 2 minke whales have been tagged north ... -
Norwegian whale marking in the northeastern North Atlantic in 1975
Christensen, Ivar (ICES CM Documents;1975/N:19, Working paper, 1975) -
Occurrence and diet of killer whales in northern Norway: seasonal patterns relative to the distribution and abundance of Norwegian spring-spawning herring
Similä, Tiu; Holst, Jens Christian; Christensen, Ivar (Journal article; Peer reviewed, 1996)Our objectives were to investigate the seasonal occurrence of photoidentified killer whale pods in relation to the distribution of Norwegian spring-spawning herring and whether or not pod-specific differences in the ... -
Report on the FAO/ACMRR Party on Marine Mammals, Ad Hoc Group II - Small Cetaceans and Sirenians
Christensen, Ivar (ICES CM Documents;1975/N:18, Working paper, 1975) -
Seasonal distribution and abundance of killer whales around Lofoten and Vesterålen Islands, northern Norway
Similä, Tiu; Christensen, Ivar (ICES CM Documents;1992/N:11, Working paper, 1992)Killer whales (Orcinus orca) have been pohotoidentified around Lofoten and Vesterålen islands northern Norway during fall-winter (October-February) and summer (June-August) in 1990 and 1991. Some background data exists ... -
Spekkhoggeren (Orcinus orca) i det nordøstlige Atlanterhav
Christensen, Ivar (Fisken og havet, Research report, 1978)During the last two or three years schools of killer whales have often been reported in fjords and even harbours in Norway. The fishermen and their organizations fear that an increasing number of killer whales may ... -
Undersøkelser av vågehval i Barentshavet og ved Øst- og VestGrønland i 1973
Christensen, Ivar (Fisken og havet, Research report, 1974)Observations of marine mammals were recorded and are tabulated. Observations of humpback whales indicate an increasing number in the eastern part of the North Atlantic. Material and data from minke whales were sampled ... -
Vågehvalundersøkelser ved Spitsbergen og i Barentshavet i mai og juni 1972
Christensen, Ivar (Fisken og havet;1972 - Nr. 3, Research report, 1972)Small whale investigations were carried out in the month May and June 1972 with two whaling vessels in the area off Svalbard and in the Barents .Sea. As far as possible all whales observed during the cruise were recorded. ... -
Whales and seals marked in the northeast Atlantic in 1974
Christensen, Ivar; Øritsland, Torger (ICES CM documents, Working paper, 1974)