Sentences with phrase «walrus populations»

Eventually Holocene warmth raised sea level and reduced sea ice allowing walrus populations to once again flourish in the Arctic.

The heavy ice of the last Ice Age must have been the nadir for walrus populations.

Although this allowed humans to enter North America, it relegated walrus populations to narrower shelf waters as far south as central California.

For the real story on polar bear populations, see Federal studies show polar bear, walrus populations in trouble.

The early walrus population along the St. Lawrence River alone has been estimated at over 100,000.

Not exact matches

For example, ocean acidification may reduce the populations of clams and snails that the walruses feed on; here, too, Wolfe says that the threat is certain.

Ten other populations are increasing, the study found, including bowhead whales and walrus, while nine others are stable.

Laidre's team looked at what is known about marine mammal populations that play a key role in Arctic ecosystems and human communities, focusing on polar bears, beluga whales, narwhals, bowhead whales, walrus, and six different seal species.

Some changes are well - known, such as declines in polar bear populations and stresses to walruses being forced out of their shallow feeding grounds as ice retreats into deeper waters.

32 Northwest mollusks 404 Southeast aquatic, riparian, and wetland species Acuna cactus Amargosa toad American pika (federal) American, Taylor, Yosemite, Gray - headed, White Mountains and Mt. Whitney pika (California) Andrew's dune scarab beetle Ashy storm - petrel Atlantic bluefin tuna Bearded seal Black abalone Blumer's dock Bocaccio (central / southern population) Cactus ferruginous pygmy owl California spotted owl California tiger salamander (federal) California tiger salamander (California) Canelo Hills ladies» tresses Casey's June beetle Cherry Point Pacific herring Chiricahua leopard frog Colorado River cutthroat trout Cook Inlet beluga whale (1999) Cook Inlet beluga whale (2006) Delta smelt Desert nesting bald eagle Dusky tree vole Elkhorn coral Gentry's indigobush Giant palouse earthworm Gila chub Great Basin spring snails Headwater chub Holmgren's milk - vetch Huachuca water umbel Iliamna lake seals Island fox Island marble butterfly Kern brook lamprey Kittlitz's murrelet (Alaska) Kittlitz's murrelet (federal) Klamath River chinook salmon Las Vegas buckwheat Least chub Loggerhead sea turtle (northern and Florida population) Loggerhead sea turtle (northern Pacific population) Loggerhead sea turtle (western North Atlantic population) Longfin smelt Mexican garter snake Mexican spotted owl Mojave finge - toed lizard North American green sturgeon Northern Rockies fisher Northern sea otter Pacific fisher (federal) Pacific fisher (California) Pacific lamprey Pacific Northwest mollusks Pacific walrus Page springsnail Palm Springs pocket mouse Parish's alkali grass Polar bear Puget Sound killer whale Queen Charlotte goshawk Relict leopard frog Ribbon seal Ringed seal River lamprey Rio Grande cutthroat trout Roundtail chub Sacramento Mountains checkerspot butterfy Sand dune lizard Sand Mountain blue butterfly Shivwitz milk - vetch Sierra Nevada mountain yellow - legged frog Sierra Nevada red fox Siskiyou Mountains salamander Sonora tiger salamander Southwestern willow flycatcher Spotted seal Spring pygmy sunfish Staghorn coral Tahoe yellow cress Tricolored blackbird Tucson shovel - nosed snake Virgin river spinedace Western brook lamprey Western burrowing owl (California) Western gull - billed tern Yellow - billed cuckoo Yellow - billed loon Yosemite toad

With the world's largest population of Pacific walruses and the highest density of ancestral polar bear dens, Wrangel Island offers incredible opportunities for wildlife viewing.

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«Arctic waters include some of the world's most productive ocean ecosystems, providing sustenance to large populations of whales, seals, and walruses and seabirds.

Marine mammals living in the polar regions rely on sea ice, and continuing reductions in the amount of ice will harm populations of seals, walruses, and polar bears.