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| Marine mammals of North America | |
|---|---|
| Name | Marine mammals of North America |
| Status | various |
| Status system | IUCN |
Marine mammals of North America are the cetaceans, pinnipeds, sirenians, mustelids, and carnivores that inhabit the coastal and offshore waters surrounding Canada, the United States, Mexico, and the islands of the Caribbean Sea and Bermuda. These taxa include whales, dolphins, porpoises, seals, sea lions, walruses, sea otters, and manatees that play keystone roles in ecosystems such as the Gulf of Mexico, the Bering Sea, the North Atlantic Ocean, and the Pacific Ocean. Conservation, management, and research on these species involve agencies and institutions including the National Oceanic and Atmospheric Administration, the Fisheries and Oceans Canada, the Mexican Secretariat of the Navy, and international bodies such as the International Whaling Commission.
North American marine mammals comprise members of orders Cetacea, Carnivora, and Sirenia. Major regions with unique assemblages include the Arctic Chukchi Sea, the subarctic Gulf of Alaska, the temperate California Current, the subtropical Gulf Stream, and the tropical Caribbean Sea. Historically, exploitation by enterprises such as the New England whaling industry and the Basque whalers drove declines addressed later by laws like the Marine Mammal Protection Act and by international agreements such as the Convention on International Trade in Endangered Species of Wild Fauna and Flora.
Taxonomic treatments follow families: Balaenopteridae (rorquals), Balaenidae (right whales), Delphinidae (oceanic dolphins), Phocoenidae (porpoises), Monodontidae (beluga and narwhal relatives), Odobenidae (walrus), Otariidae (eared seals), Phocidae (earless seals), Mustelidae (sea otter), and Trichechidae (manatees). Notable biogeographic boundaries include the Alaska Current and the California Current System, with species like the blue whale and the humpback whale ranging across ocean basins, whereas endemics such as the North Atlantic right whale and the Florida manatee have restricted distributions tied to features like the Gulf Stream and the Everglades National Park. Populations are monitored within jurisdictions including British Columbia, Alaska, California, Florida, Yucatán Peninsula, Nova Scotia, and island territories such as Puerto Rico.
Representative cetaceans include the baleen whales: blue whale, fin whale, minke whale, sei whale, humpback whale, and the endangered North Atlantic right whale. Toothed whales include the sperm whale, killer whale, narwhal, beluga whale, short-finned pilot whale, and coastal odontocetes like the bottlenose dolphin and the harbour porpoise. Pinnipeds include earred seals such as the California sea lion and the Steller sea lion, phocids like the harp seal, gray seal, harbour seal, and Arctic specialists such as the ringed seal and the bearded seal. The walrus is represented by the Pacific walrus in the Bering Strait region. The only extant sirenian is the West Indian manatee (including Florida manatee populations). Mustelids include the sea otter, with relict populations protected in areas like Monterey Bay and Kodiak Island. Many populations are focal species for recovery planning under statutes such as the Endangered Species Act in the United States and recovery strategies under Species at Risk Act in Canada.
Marine mammals occupy habitats from polar ice edges in the Arctic Ocean and Southern Ocean marginal seas to tropical seagrass beds in the Caribbean Sea and Gulf of Mexico. Baleen whales feed on zooplankton and small nekton concentrated by oceanographic processes including upwelling along the California Current and convergence zones near the Gulf Stream. Toothed whales use echolocation in deep-water habitats such as the Sargasso Sea and submarine canyons like the Cascadia Channel and Monterey Canyon. Pinnipeds haul out on substrates ranging from pack ice in Hudson Bay to rocky shores in the Aleutian Islands and sandy beaches in Cape Cod. Sirenians depend on seagrass meadows in regions like Biscayne Bay and the Yucatán for foraging. Predation, competition, and disease dynamics involve interactions with apex predators such as Great white shark in coastal waters and pathogens studied by institutions such as the Smithsonian Institution and Canadian Wildlife Service.
Major threats include entanglement in fishing gear, ship strikes in shipping lanes like the St. Lawrence Seaway and the Port of Los Angeles and Long Beach, noise pollution from naval exercises involving the United States Navy and seismic surveys, habitat loss from coastal development in places such as Miami and Cancún, and climate change effects on ice habitats in the Arctic Council area. Conservation measures are implemented via laws and agreements including the Marine Mammal Protection Act, the Endangered Species Act, the International Whaling Commission moratoria, and regional plans like the Atlantic Large Whale Take Reduction Plan. NGOs such as the World Wildlife Fund, Sea Shepherd Conservation Society, Ocean Conservancy, and the Marine Mammal Center collaborate with universities like University of Washington, Scripps Institution of Oceanography, Dalhousie University, and University of Miami.
Human interactions range from indigenous subsistence harvests recognized under agreements involving groups such as the Inuit Tapiriit Kanatami and the Alaska Native Claims Settlement Act beneficiaries, to tourism activities in areas like Monterey Bay National Marine Sanctuary, Stellwagen Bank National Marine Sanctuary, and Baja California. Management tools include marine protected areas such as Pacific Remote Islands Marine National Monument, species-specific recovery plans under the National Marine Fisheries Service, bycatch mitigation measures developed with industry partners including the United Fishermen of Alaska, and international cooperation through entities like the International Maritime Organization to reduce ship strikes and implement routing measures similar to those in the Bay of Fundy.
Research employs techniques such as passive acoustic monitoring used in projects by Woods Hole Oceanographic Institution and Cornell Lab of Ornithology analogues, satellite telemetry pioneered with tags from institutions like NOAA Fisheries', photo-identification catalogs maintained by groups such as the Center for Coastal Studies and the Happywhale platform, genetic analyses conducted at labs in Smithsonian Institution and National Institutes of Health collaborations, and population modeling by agencies including Fisheries and Oceans Canada and the National Marine Fisheries Service. Emerging methods include drone-based surveys used around Alaska and Florida, environmental DNA sampling in estuaries like the Chesapeake Bay, and community science platforms coordinated with organizations such as the Monterey Bay Aquarium and local marine mammal stranding networks.
Category:Marine mammals Category:Fauna of North America