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| Hooded seal | |
|---|---|
| Name | Hooded seal |
| Status | VU |
| Status system | IUCN3.1 |
| Genus | Cystophora |
| Species | cristata |
| Authority | (Erxleben, 1777) |
Hooded seal is a large pinniped native to the North Atlantic and adjacent Arctic regions. It is notable for sexual dimorphism, a distinctive inflatable nasal proboscis in males, and a brief but intense lactation period. The species is subject to international management, regional fisheries interactions, and conservation concern.
The species is placed in the genus Cystophora and was described by Johann Christian Polycarp Erxleben in 1777, connecting historical natural history to modern International Union for Conservation of Nature assessments and taxonomic revisions by institutions such as the American Museum of Natural History and museums in Copenhagen. Paleontological work in the Pleistocene and comparative analyses with other phocids link the species to fossil records curated by organizations like the Natural History Museum, London and researchers publishing through the Smithsonian Institution. Evolutionary studies compare genetic data to other true seals in datasets contributed to projects affiliated with the Max Planck Society and the Broad Institute, while climate-driven distribution changes are analyzed in reports by the Intergovernmental Panel on Climate Change.
Adult morphology has been described in monographs produced by the Canadian Museum of Nature and the Scottish Natural Heritage; males reach larger masses referenced in field guides from the Marine Mammal Commission. Distinctive features include a skull and dentition discussed in osteological surveys at the Natural History Museum of Denmark and sexual dimorphism recorded in papers in journals associated with the Royal Society. The inflatable nasal sac of adult males is analogous in display function to structures studied in behavioral ecology literature from the Royal Society Publishing and described by researchers at the University of Tromsø. Muscle and blubber distributions have been measured in tagging studies supported by the National Oceanic and Atmospheric Administration and the Fisheries and Oceans Canada.
Range maps used by the International Union for Conservation of Nature show occurrences in the northwest and northeast Atlantic, including waters off Labrador, Greenland, the Barents Sea, and the Icelandic continental shelf. Seasonal use of pack ice and polynyas is documented in regional studies by the Norwegian Polar Institute and the Greenland Institute of Natural Resources. Satellite telemetry programs run by the University of St Andrews and the Scottish Association for Marine Science elucidate movements relative to sea-ice dynamics reported to the Arctic Council and in assessments by the European Environment Agency.
Display behavior, including aerial and underwater vocalizations, is characterized in symposia hosted by the Society for Marine Mammalogy and papers in the Journal of Experimental Biology. Males use the inflatable nasal proboscis in agonistic and mating displays studied by researchers affiliated with the University of British Columbia and the University of Iceland. Aggregation patterns on ice are monitored during surveys coordinated with the North Atlantic Marine Mammal Commission and national agencies such as the Icelandic Institute of Natural History. Social interactions have been the subject of field studies supported by the Woods Hole Oceanographic Institution.
Reproductive timing and the extreme short lactation—about four days—are summarized in management reports by the Canadian Department of Fisheries and Oceans and reproductive ecology papers from the University of Guelph. Pup development, weaning strategies, and maternal energetics have been examined in theses deposited at institutions like the University of Oslo and peer-reviewed articles appearing in journals connected to the Ecological Society of America. Age at sexual maturity and longevity estimates appear in datasets compiled by the IUCN and monitoring programs run by the Marine Mammal Commission.
Diet composition—dominated by mesopelagic and demersal fish and cephalopods—is reported in stomach-content studies published through the Fisheries Research literature and supported by sampling programs of the Northwest Atlantic Fisheries Organization. Foraging depths and dive profiles have been recorded in telemetry projects funded by the Natural Environment Research Council and analyzed with statistical support from groups at the University of Cambridge. Prey species referenced in regional food-web studies include taxa surveyed by the Icelandic Fisheries Research, whose catch data inform ecosystem models used by the International Council for the Exploration of the Sea.
The species is listed as Vulnerable on assessments guided by the IUCN and faces threats from climate-driven loss of sea ice documented by the Intergovernmental Panel on Climate Change and regional summaries from the Arctic Monitoring and Assessment Programme. Bycatch in fisheries monitored by the Northwest Atlantic Fisheries Organization and direct hunting regulated under national laws of Greenland and Canada have been addressed in management plans coordinated with the Convention on International Trade in Endangered Species of Wild Fauna and Flora reporting frameworks. Pollution, including persistent organic pollutants and contaminants tracked by the United Nations Environment Programme, and disturbance from shipping in lanes managed by the International Maritime Organization are additional concerns. Conservation measures involve multinational cooperation through bodies such as the Agreement on the Conservation of Seals in the Wadden Sea and research collaborations among universities and agencies like the Norwegian Institute for Nature Research.
Category:Pinnipeds Category:Marine mammals of the Arctic