Sarsia 

About: Sarsia is an academic journal. The journal publishes majorly in the area(s): Population & Genus. It has an ISSN identifier of 0036-4827. Over the lifetime, 1288 publications have been published receiving 30436 citations.

Nematodes from some Norwegian marine fishes

Abstract: The present paper deals with nematode parasites from some Norwegian marine fishes. The major part of the material was collected personally from fishes caught in the fjords near Bergen and Tromso; the minor part of the material was obtained from the zoological museums in Oslo and Bergen and from other sources. 260 specimens of fish, belonging to 64 species, have been searched for nematode parasites. 9 species of fish were found to be free of nematodes.

The use and abuse of fish otoliths in studies of feeding habits of marine piscivores

Abstract: The form and structure of fish otoliths are species specific, allowing them to be used as an aid in identification of prey species consumed by piscivores. Otholith length-fish length relationships can have application in the estimation of the size of fish prey consumed by squid, but, because otoliths are relatively rapidly attacked by acidic solutions, these relationships can not be used routinely for the estimation of the size of fish taken by marine mammals, birds and predatory fishes. Evidence from recent physiological studies of gastrointestinal motility suggests that indigestible material (skeletal fragments and otoliths) would not accumulate in the stomachs of marine mammals and birds, and any otoliths found amongst stomach contents probably represent the remains of a single feeding bout. Thus, the identification and counting of otoliths could provide a quantitative estimate of consumption of numbers of fish within different species. Results of anal)(ses of faecal material may not give accu...

The distribution of the scleractinian coral Lophelia pertusa around the Faroe islands and the relation to internal tidal mixing

Abstract: A list of 138 positions with records of Lophelia pertusa is compiled from all published and unpublished investigations in the area including material from the BIOFAR research programme. In addition, Solenosmilia variabilis, another species of branching coral new to the area is reported. The Lophelia records are from areas that are dominated by the northeastern Atlantic water (NEA W) and in depths from 200 to c. 1000 m. The highest abundance of Lophelia tends to be in the depth range where the bottom slope is critical to internal waves of semidiurnal frequency. The causal link behind this is suggested to be an increase of food availability either through higher primary production at the surface or by a redistribution of suspended particles in the bottom mixed layer.

Deep water bioherms of the scleractinian coral Lophelia pertusa (L.) at 64° n on the Norwegian shelf: Structure and associated megafauna

Abstract: Megafauna on bioherms (large biological structures) of the scleractinian coral Lophelia pertusa at 240-290 m depth in the Haltenbanken- Fmyabanken area was investigated by video-recording. Sixteen transects from soft bottom with scattered patches of stones below bioherms to top of bioherms were analysed. Fauna patterns were related to the near-bottom currents. The orientation of the gorgonianParamuricea placomus was used as an indicator of the direction of the main currents at the bioherms. The bioherms were 2 to 31 m high, and had a basal area ranging from 1 500 to 50 600 m2. 36 taxa were identified, of which five taxa only occurred on the bioherms, and five only on the soft bottom with scattered stones. The diversity, H', was highest in the zone of dead Lophelia, and lowest on the silty clay. None of the 26 taxa observed on stones were spesific for this habitat, but occurred also on the bioherms or the soft bottom. The area with Lophelia rubble, near the basis of the bioherms, had the lowest nu...

Recruitment of Atlantic cod stocks in relation to temperature and advectlon of copepod populations

Abstract: The recruitment of Atlantic cod stocks shows different responses to temperature changes. Cod stocks inhabiting the lower temperature range show generally an increase in recruitment with increasing temperature, while cod stocks inhabiting the uppermost part of the temperature range show a decrease in recruitment with increasing temperature. In the present paper possible functional relationships between temperature and cod recruitment mechanisms are analysed. Temperature influences the recruitment processes in a large number of ways; partly directly on vital rates in cod, and partly indirectly through trophic transfer. The copepod Caianus fin marchions is the dominant prey species for the early stages of cod. It proposed that the recruitment-temperature relation of Atlantic cod is a proxy for the food abundance during the early stages, and that advection of C.finmarchicus from the core production regions in the central parts of the North Atlantic Subpolar Gyre to the fringes where the cod stocks ha...