News tagged with marine mammal
What do killer whales eat in the Arctic?
Killer whales (Orcinus orca) are the top marine predator, wherever they are found, and seem to eat everything from schools of small fish to large baleen whales, over twice their own size. The increase in hun ...
Jan 30, 2012 |
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Groups sue over Navy sonar use off Northwest
Conservationists and Native American tribes are suing over the Navy's expanded use of sonar in training exercises off the Washington, Oregon and California coasts, saying the noise can harass and kill whales ...
Jan 26, 2012 |
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Marine mammals on the menu in many parts of world
The fate of the world's great whale species commands global attention as a result of heated debate between pro and anti-whaling advocates, but the fate of smaller marine mammals is less understood, specifically ...
Jan 24, 2012 |
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Stranded baby seals concern Dutch rescuers
A month ago, a young seal named Marco washed up on a beach on the northern Dutch Frisian island of Ameland, one of a growing number of recently stranded pups that has left his rescuers worried.
Jan 23, 2012 |
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Juvenile predation preventing Steller sea lion recovery
A new study suggests that the impact of predation on juvenile Steller sea lions in the Gulf of Alaska has been significantly underestimated, creating a "productivity pit" from which their population will have ...
Jan 18, 2012 |
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Revolutionary tool will methodically track ocean populations
Oceanographer Chuck Greene envisions a day when he will be able to observe the ocean the way a meteorologist observes the weather -- with continuous streams of data that allow him to see changes as they happen ...
Space & Earth / Earth Sciences
Jan 06, 2012 |
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Study examines how diving marine mammals manage decompression
Any diver returning from ocean depths knows about the hazard of decompression sickness (DCS) or "the bends." As the diver ascends and the ocean pressure decreases, gases that were absorbed by the body during ...
Dec 21, 2011 |
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Whale activists sue to free Lolita from captivity
(AP) -- Supporters have offered $1 million for her release. Annual demonstrations have demanded her return to the Northwest. Over the years, celebrities, schoolchildren and even a Washington state governor ...
Dec 04, 2011 |
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Seals show different levels of parenting skills
(PhysOrg.com) -- Grey seals have different types of personality that affect the extent to which they guard and care for their young, according to new research.
Nov 23, 2011 |
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Whales in the desert: Fossil bonanza poses mystery
(AP) -- More than 2 million years ago, scores of whales congregating off the Pacific Coast of South America mysteriously met their end.
Other Sciences / Archaeology & Fossils
Nov 19, 2011 |
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Stranded dolphins exhibit bubbles, and ability to recover
Scientists know that the blood and tissues of some deceased beaked whales stranded near naval sonar exercises are riddled with bubbles. It is also well know that human divers can suffer from bubbles-induced ...
Oct 19, 2011 |
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New, higher estimates of endangered humpback whales in the North Pacific
Scientists have increased the estimate on the number of humpback whales in the North Pacific Ocean in a paper published in the journal Marine Mammal Science. The increase follows a refined statistical analys ...
Oct 18, 2011 |
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New computer program promises to save the whales
Researchers at the University of Montreal have developed a computer programme that enables regulators to evaluate the ecological and economic tradeoffs between marine mammal conservation, whale watching and ...
Oct 11, 2011 |
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Scientists shocked by behavior of rare gray whale
Scientists tracking a rare western Pacific gray whale were shocked last winter when the endangered animal left the Asian coast, crossed the Bering Sea and swam south along Alaska, British Columbia and the Pacific Northwest ...
Sep 14, 2011 |
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Insights into Brucella and other gram negative bacteria infecting marine mammals
As with their terrestrial counterparts, marine mammals are colonized by a range of bacteria, some of which are friendly and others which can cause disease.
Sep 14, 2011 |
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Marine mammal
Marine mammals are a diverse group of roughly 120 species of mammal that are primarily ocean-dwelling or depend on the ocean for food. They include the cetaceans (whales, dolphins, and porpoises), the sirenians (manatees and dugong), the pinnipeds (true seals, eared seals and walrus), and several otters (the sea otter and marine otter). The polar bear, while not aquatic, is also usually considered a marine mammal because it lives on sea ice for most or all of the year.
Marine mammals evolved from land dwelling ancestors and share several adaptive features for life at sea such as generally large size, hydrodynamic body shapes, modified appendages and various thermoregulatory adaptations. Different species are, however, adapted to marine life to varying degrees. The most fully adapted are the cetaceans and the sirenians, which cannot live on land.
Despite the fact that marine mammals are highly recognizable charismatic megafauna, many populations are vulnerable or endangered due to a history of commercial exploitation for blubber, meat, ivory and fur. Most species are currently protected from commercial exploitation.
For more information about Marine mammal, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
