Sealion

Some dogs chase cars, some chase bikes, others chase… sea lions? Yes, it appears that some dogs don’t limit the things they chase to just things on land apparently.

It seems a dog needed to be rescued after chasing a sea lion for over four kilometers out to sea in Southern Australia.

The dog, a crossbreed named Westie, was out taking a walk with his master along the beach when he suddenly took off into the water after a sea lion and simply refused to come back, the Portside Messenger reported.

Soon the sea lion and Westie were out of sight, somewhere over the horizon as the sea lion led Westie farther and farther from the shore, leaving his owner feeling helpless.

Craig Van Tenac, a Semaphore Surf Life Saving Club captain, was part of the efforts to rescue Westie.

“I’d say it was four kilometers offshore – that dog swam forever,” he commented when asked about what happened.

Westie apparently was having a good time, frolicking around and rubbing his nose against the sea lion, who was busy rolling about playfully in the water, he continued.

Despite Westie’s amazing stamina, Van Tenac commented that he had his doubts that Westie, who had been chasing after the sea lion for more than an hour, could have possibly made it back to shore.

He continued to say that Westie’s owner was very much relieved that he came back to the shore safe and sound, and no worse for wear.

Sealion

It seems that sea lions have once again pulled the wool over the eyes of researchers. We all know it’s a rough world, and no less is true of those poor orphaned sea lion pups. However, decades of painstaking research has proven that the sea lion females shun any sea lion pups which aren’t there own.. Or do they?

A new bit of genetic research of the populations of Californian sea lions, published this past Monday in the online journal PloS ONE, now sheds some new light on the subject, and states that sea lions are not as cold as they are made out to be.

Up to seventeen percent of the females in the California sea lions populations off of Mexico’s coast will actually take on an orphaned pup as one of their own offspring, according to the new research. What is even more amazing, is that the researchers were able to watch the females care for these pups year after year.
“Females are incredibly aggressive toward pups that aren’t theirs. They’ll bare teeth and bark, sometimes grab and toss pups that aren’t their own away,” explains a marine biologist at Arizona State University who made the discovery through an unrelated research effort, Ramona Flatz. “That they adopt at all really surprised us. We didn’t think it happened.”

So, while the chances are not that high that an orphaned pup can find an adoptive mother, the chance still exists, so like people, there are some decent sea lions out there…

Sealion

It appears that Washington and Oregon should slaughter more California sea lions over at the Bonnerville Dam this coming new year to help put the states’ controversial “lethal take” program – which is three years old – to the test, and see if it can meet its main goal of dropping the number of salmon feasted upon by sea lions, a joint task force decided this past Wednesday.

The task force apparently believes that the proper way to handle the sea lions is to shoot them from land, or from boat, rather than trapping them and then subjecting them to a lethal injection. Fifteen of the sixteen members of the Pinniped Fishery Interaction Task Force agree on this course of action.

The National Oceanic and Atmospheric Administration, which is helping to keeps tabs on the lethal- take program, should make the actual identifying of the sea lions which need to be taken care of, much much easier, the task force added.

The two states have a combined score of 40 slaughtered sea lions since they began the dark project back in 2008, which includes four which seem to have perished accidentally in the traps that year. However, the actual number of salmon the seal lions are consuming is growing, from a reported 3,846 in the spring of 2007, to a whopping 5,095 in the Spring of 2010, as reported by the US Army Corps of Engineers.

So their plan of “Kill one to save another” doesn’t seem to be working to well, however, the plan seems to be keep trying until they get it right…

Steller's sea lions

The poor endangered Steller’s sea lions are surviving so poorly, and their populations decreasing alarmingly, at the point of Alaska’s Aleutian Islands that the Obama administration is stepping up, and calling for the immediate cease and desist order for the commercial fishing of two very prominent species of fish; the Atka mackerel and the Pacific cod.

This shutdown being proposed by the Obama administration would only hit a small, yet vital portion of Alaska’s largely Seattle-based fishing industry.

However, it is also the latest proof that the sea lions have become a proxy in a heated battle over fishing in Alaska. Both environmentalists and big Industry are keeping their eye on what’s happening to the $1 billion a year pollock industry in the Bering Sea nearby. The fishery there supplies half of the country’s catch of fish.

On Monday the fishing industry expressed their concerns at the rapid and sever proposal put out by the Obama administration. It should be noted however, that this proposal was made in response to a 45 percent drop in the western Aleutians’ sea lion population since 2000. That’s quite a dip in only 10 short years.

The National Marine Fisheries Service wants to have everything closed down and other preventative measures in place by next year.

“What they’ve put on the table today is a head shot for us,” exclaimed counsel for United States Seafood in South Seattle, Dave Wood.

Throughout December, hundreds of sea lions vanished from the San Francisco bay area only to show up later in the Oregon Sea Lion Caves. The Oregon Sea Lion Caves are a connected system of sea caves and caverns located along the Pacific coast of Oregon and a popular hangout for sea birds such as the tufted puffin, pigeon guillemot, Brandt’s cormorant, and various types of gulls. The caves are also an important wintering home for the Stellar Sea Lion and – to a lesser extent –the California Sea Lion.

“We’re seeing the sea lions coming up this way from California because of the feeding. If the cold water fish move north to find colder waters, the sea lions have to eat and they follow the fish wherever they go,” says Sea Lion Caves General Manager Dan Harkins.

So, how can the cave staff know for sure who’s a visitor from California and who isn’t? Apparently, sea lions have dialects; just like us humans.

“We can identify them by the sound of their voice. They have a barking noise rather than a grumbling or a growling that Stellers do,” says Harkins.

The Sea Lion Caves were first explored in 1880 by local resident Captain William Cox. On a calm day, the captain entered the grotto through the western channel in his small boat. During a later expedition he was reportedly marooned due to stormy weather and had to survive by shooting a sea lion and eating its flippers. In 1887 Captain Cox purchased the land from the State of Oregon and the cave system has been privately owned and managed ever since.

Modern seals, walruses, and sea lions are all descendants of animals that once lived on land but eventually swapped their terrestrial lifestyle for a life in the ocean. Until now, the morphological evidence for this transition from land to water has been weak, but researchers from Canada and the United States have now found a remarkably well preserved skeleton of a newly discovered carnivorous animal: Puijila darwini.

Skeletal illustration of Puijila darwini.
Credit: Mark A. Klingler/Carnegie Museum of Natural History

Seals, walruses and sea lions all have flippers; a type of limb perfectly adapted for swimming and moving around in water. But how could a land living animal develop flippers? The adaptation evolved gradually over a long period of time, as some land living animals adapted semi-aquatic habits. New research now suggests that the genus Puijila is the “missing” evolutionary link between our modern seals, walruses and sea lions and their terrestrial ancestors.

Puijila darwini is described as having fore-limbs comparatively proportionate to modern carnivorous land animals rather than to pinnepeds*, a long tail, and webbed feet.

“The remarkably preserved skeleton of Puijila had heavy limbs, indicative of well developed muscles, and flattened phalanges which suggests that the feet were webbed, but not flippers. This animal was likely adept at both swimming and walking on land. For swimming it paddled with both front and hind limbs. Puijila is the evolutionary evidence we have been lacking for so long,” says Mary Dawson, curator emeritus of Carnegie Museum of Natural History.

The Puijila darwini skeleton was found in Nunavut, Canada in the remains of what was once a crater lake on coastal Devon Island. The first pieces of the skeleton were found in 2007, but the important basicranium wasn’t found until researchers paid a new visit to the site in 2008. Without a basicranium it is much more difficult to determine taxonomic relationships.

Based on Paleobotanic fossils, Devon Island had a cool, coastal temperate climate during the Miocene when Puijila darwini roamed the seashore. The conditions were quite similar to modern-day New Jersey and the lakes would freeze during the winter, something which probably prompted Puijila darwini to move over land from the lake to the sea in search of food.

“The find suggests that pinnipeds went through a freshwater phase in their evolution. It also provides us with a glimpse of what pinnipeds looked like before they had flippers,” says Natalia Rybczynski, leader of the field expedition.

The idea that semi-aquatic mammals may have undergone a transition from freshwater to saltwater is not new. In the On the Origin of Species by the Means of Natural Selection, Charles Darwin writes “A strictly terrestrial animal, by occasionally hunting for food in shallow water, then in streams or lakes, might at last be converted in an animal so thoroughly aquatic as to brace the open ocean.”

The oldest well-preserved pinniped animal belongs to the genus Enaliarctos and was a sea living creature with flippers. This species has been found on North Americas northern Pacific shores which have lead researchers to believe that the evolution of pinniped animals may have taken place mainly around the Arctic. This new finding of Puijila darwini strengthens that notion.

You can find more information about Puijila darwini and the origin of pinnipeds in the April 23 issue of the journal Nature.

http://www.nature.com

http://www.nature.com/nature/index.html

* The pinnipeds are a widely distributed and diverse group of semi-aquatic marine mammals. It contains the families Odobenidae (walruses), Otariidae (eared seals, including sea lions and fur seals), and Phocidae (earless seals). The name is derived from the Latin words pinna, which means wing or fin, and ped, which means foot. The pinnipeds are therefore also known as fin-footed mammals.