thick-billed murre

thick-billed murre
Name	Thick-billed murre
Status	NT
Status system	IUCN3.1
Genus	Uria
Species	lomvia
Authority	(Pontoppidan, 1763)

thick-billed murre is a medium-large auk native to Arctic and subarctic coasts. It is a dense, black-and-white seabird notable for deep-diving foraging and cliff-nesting colonies that draw attention from researchers and conservationists. Populations are monitored by agencies and institutions across North America and Eurasia because of sensitivity to climate-driven changes in marine ecosystems.

Taxonomy and systematics

The species was described by Erik Pontoppidan in 1763 and placed in the genus Uria, which groups with other auks such as the common murre and shares affinities with genera studied by ornithologists at institutions like the Royal Society and the Smithsonian Institution. Molecular phylogenetic work involving laboratories at the Max Planck Society, Natural History Museum, London, and universities such as University of Copenhagen and University of British Columbia has clarified relationships among Alcidae and revealed divergence times consistent with Pleistocene glacial cycles referenced in studies by the National Oceanic and Atmospheric Administration and the Norwegian Polar Institute. The species is recognized by conservation bodies including the IUCN and national lists maintained by agencies such as Environment and Climate Change Canada and the US Fish and Wildlife Service.

Description

Adults exhibit a compact, torpedo-shaped body with black dorsal plumage and white ventral surfaces, a robust bill adapted for grasping fish, and a streamlined shape similar to diving birds studied by researchers at the Monterey Bay Aquarium Research Institute and the Woods Hole Oceanographic Institution. Field guides produced by the American Ornithological Society, the British Trust for Ornithology, and museums like the American Museum of Natural History describe diagnostic features used by birdwatchers visiting locations such as Svalbard, the Bering Sea, and Hudson Bay. Vocalizations recorded by technicians at the Cornell Lab of Ornithology are used alongside morphological metrics from specimens in collections at the Natural History Museum of Denmark and the Canadian Museum of Nature to differentiate subspecies and age classes.

Distribution and habitat

The species breeds on high-latitude cliffs and offshore islands across the North Atlantic and North Pacific, with major colonies documented on Svalbard, the Aleutian Islands, Baffin Island, Greenland, and northern coasts of Russia. Non-breeding movements take birds into waters monitored by organizations like the North Atlantic Marine Mammal Commission and fisheries agencies such as the North Pacific Fishery Management Council. Habitat use overlaps with marine protected areas designated by governments including Canada, Norway, and Russia and with shipping lanes traversed by vessels of the International Maritime Organization. Seabird observers from expeditions organized by groups such as the Royal Geographical Society and the Scott Polar Research Institute have documented changes in distribution associated with sea-ice retreat studied by the Intergovernmental Panel on Climate Change.

Behavior and ecology

Thick-billed murres forage by wing-propelled diving, reaching depths reported in collaborative research by teams from the British Antarctic Survey, Norwegian Institute for Nature Research, and the Sea Mammal Research Unit. Diets include small schooling fish and invertebrates monitored by the North Pacific Research Board and the Atlantic Salmon Federation in ecosystem assessments. Predation pressure from species recorded by biologists at the Royal Society for the Protection of Birds includes glaucous gulls and marine mammals such as polar bears in locations like Hudson Strait. Interactions with fisheries managed by entities such as the International Council for the Exploration of the Sea influence bycatch rates documented by the Food and Agriculture Organization. Long-term ecological data collected by projects funded by the European Union and national research councils reveal links between murre foraging success and climate indices used by the National Aeronautics and Space Administration and NOAA.

Breeding and life cycle

Colonial breeders, pairs nest on narrow cliff ledges in dense aggregations studied at colonies surveyed by teams from the RSPB and the Canadian Wildlife Service. Reproductive timing is synchronized with spring plankton and fish pulses documented by programs such as the Global Ocean Observing System and the PICES network. Eggs are incubated by biparental care noted in fieldwork supported by the Natural Sciences and Engineering Research Council of Canada and universities like University of Alaska Fairbanks. Fledging involves a single chick leaping to the sea and following parents, behavior observed by researchers affiliated with the Smithsonian Migratory Bird Center and the Finnish Museum of Natural History. Survival rates and age at first breeding are parameters estimated in demographic studies funded by the BirdLife International partnership and national agencies including Environment and Climate Change Canada.

Conservation and threats

Populations have experienced regional declines prompting assessments by IUCN and listing decisions by jurisdictions such as Canada and the United States. Threats include climate change impacts documented by the IPCC, bycatch in commercial fisheries regulated by bodies like the North Pacific Fishery Management Council, oil spills involving tankers regulated through conventions administered by the International Maritime Organization, and contamination from persistent organic pollutants tracked by programs of the United Nations Environment Programme. Conservation actions promoted by organizations including BirdLife International, the RSPB, and the Canadian Wildlife Service emphasize protected area designation, bycatch mitigation measures implemented by fisheries agencies, and long-term monitoring coordinated with research institutions such as the Woods Hole Oceanographic Institution and the Norwegian Polar Institute.

Category:Uria Category:Birds of the Arctic Category:Seabirds