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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Ecology and evolution
2025
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| Accès en ligne: | https://pubmed.ncbi.nlm.nih.gov/40584681/ |
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Table des matières:
- Spatial Distribution of Greenland Shark (Bloch & Schneider, 1801) Life Stages Across the Northern North Atlantic. Nielsen, Julius Christiansen, Jørgen Schou Præbel, Kim Møller, Peter Rask Devine, Brynn Jakobsdóttir, Klara Straube, Nicolas Nogueira, Adriana Treble, Margaret Hedges, Kevin Atchison, Sheila Ofstad, Lise Helen Junge, Claudia Wheeland, Laura Hedeholm, Rasmus Greenland sharks (Bloch & Schneider, 1801) are long-lived and highly migratory animals distributed throughout deep and/or cold waters of the North Atlantic Ocean. Extensive bycatch in several demersal fisheries in the Arctic has raised conservation concerns for the species, of which surprisingly little is known about the spatial distribution in relation to their life history. In the current study, size, sex, and life stage composition of 1610 Greenland sharks were examined from 11 geographic regions across the northern North Atlantic Ocean. Subadult females dominated in most regions, and while adult females were scarce or absent in, for example, northern Arctic Canada and Svalbard, they dominated in southwest Greenland and Iceland. Furthermore, in southern Arctic Canada, northwestern Greenland, and southeastern Greenland, adult females were more commonly encountered in offshore waters than inshore. Depth (25 m to 1375 m) had little effect on the spatial distribution irrespective of length and life stage, whereas water temperatures (-1.54°C to 10.9°C) conclusively showed that adult females preferred warm water (> 4°C). Large juveniles were encountered in most regions but dominated in Skagerrak and in offshore southern Arctic Canada. Small juveniles and neonates were encountered with only five and zero records, respectively, combined for all analyzed regions. In an additional effort to identify these rare, small-sized specimens, scrutinization of museum collections and databases of scientific institutions disclosed a cluster of ten neonates (total length