Tag: "sharks" at biology news

Why the hammerhead shark's head is in the shape it's in

...ing area of the head combine to provide hammerhead sharks with a morphologically enhanced electroreceptive c...ides evidence that the head morphology of sphyrnid sharks is in line with the assumption and predictions of the enhanced electrosensory hypothesis. The greate...

Shark fin soup: Scientists now can tell which kind of shark

...ian markets is driving an upsurge in the number of sharks caught. To conserve onboard space for more valuabl...agle, silky, and longfin and shortfin makos. These sharks are sought after in the global fin market, and are also frequently caught as bycatch in tuna and swo...

Industrial fishing threatens sharks, dolphins, billfish

...much earlier ages than the non-target species like sharks and dolphins, their populations are able to withst... 20-50 percent decline in populations of dolphins, sharks and billfishes like marlin, sailfish and swordfish. "The models are part of the toolbox for manager...

First practical test for monitoring shark trade

... look the same. Now there is a new way to identify sharks from just their fins. "We have developed an effic...verexploitation threatens fish all over the world, sharks are particularly vulnerable because they grow and reproduce slowly. But shark conservation and manag...

Shark Attack News & Science Briefing

...th resources where they can go to learn more about sharks and how to reduce their risk of a shark encounter; and to provide the media with additional scientific and fishery management background material. SPONSORS: National Sea Grant College Program, NOAA Fisheries FOR FURTHER INFORMATION: Ben Sh...

'Summer of the Shark in 2001 more hype than fact, new numbers show

...ncy medical personnel retrieved the arm out of the sharks throat. Surgeons later reattached the limb. It w...993 U.S. fishery regulations have resulted in more sharks is groundless, Burgess said. Sharks are slow-growing animals and most of those born eight years ago ...

Alaskan waters growing hospitable to sharks while seals and sea lions decline

... bay near Port Gravina, Prince William Sound. More sharks mass unseen below the surface. All are likely fe...reeks. That aerial count would be a high number of sharks in one spot for any place in the world, said Vince Gallucci, University of Washington professor of f...

The oceans top 10 coral reef hotspots identified for first time

...ntain abundant populations of reef species such as sharks that quickly disappear from overexploited reefs. These include places such as New Guinea, a terrestrial tropical wilderness area that also has coral reefs in near pristine condition relative to other parts of the world. The study recommends that con...

White sharks migrate thousands of miles across the sea, new study finds

...ng predators in the sea. Scientists studying white sharks along the California coast have longbelieved that ... migrations and environmental preferences of white sharks have remainedelusive," observed Block, the Charles and Elizabeth Prothro Professor ofBiological Scie...

University of Rhode Island fisheries oceanographers study the effects of predator-prey interactions in the Georges Bank fish community

...ost important predators, but have been replaced by sharks and rays as the dominant fish eaters in more recen...ng to record levels of abundance. Predation by sharks and rays does not appear to be a significant source of mortality for cod and haddock. Most of the pr...

New fossils suggest whales and hippos are close kin

...gone," says Gingerich, who speculates that ancient sharks scavenged those parts before the bones became fossilized. Finally last October, on their first morning at a new field site in Pakistan, Gingerich's team found a whale ankle bone that would answer the artiodactyl question. The bone was so clearly li...

Cover story in Science reveals historical overkill of marine Megafauna triggered current ocean crises

...urtles, alligators, giant sturgeon, and hammerhead sharks were all once abundant inhabitants of Chesapeake Bay but are now virtually eliminated. * Overfishing of large fish has led to overgrowth of algae on coral reefs, which has smothered the reefs and jeopardized the approximately 3 million species they h...

New great white shark study has conservation implications

...Boulder researcher that indicates male great white sharks roam Earths oceans much more widely than females h...e researchers compared the genetics of great white sharks from the Australia-New Zealand region and South African coastal zones -- two areas with the greatest...

Gulp! URI professor studies how sharks eat

...nt. Wilga, a North Kingstown resident, studies how sharks use their upper jaw when feeding. "Its a mechanism...er jaw retracts under the head. Unlike humans, the sharks upper jaw isnt fused to its cranium. To discover exactly how sharks eat, Wilga videotapes small spot...

UF study shows all-time high number of shark attacks last year

...and locales where tourists unwittingly encountered sharks were Kiribati, the Galapagos, Fiji and the Indian Ocean's remote Reunion Island. Such victims now help in scientific investigations by surfing the Internet for information on shark attacks, finding the ISAF's Web site and e-mailing their person...

Science and Amersham Pharmacia Biotech grand prize: "jumping DNA" discovery explains immune system evolution

... into place." Found in all jawed vertebrates, from sharks to humans, the RAG1 and RAG2 genes explain why higher animals have complex immune systems, including a first and second line of defense against invading pathogens. Some 450 million years ago, Agrawal's research suggested, a bit of jumping genet...

Shark cancers cast more doubt on cartilage pills

...r cure or preventative have claimed for years that sharks never get cancer, but this week scientists from Th...ed history of benign and malignant tumors found in sharks and related fishes. At a news conference at the annual meeting of the American Association fo...

Unusual mussels may use whale bones en route to hot sea-floor vents

...od for numerous scavengers, including huge sleeper sharks and slimy hagfish, that reduce the body to bones within months. After the scavengers, bacteria and diverse invertebrates move in, including worms, mollusks, crustaceans and other animals. These communities can thrive for years, Smith said, and can co...

New paleontology research from Natural History Museum of L.A. at international conference

.... Is it a relative of the extinct 'great-toothed' sharks that swam 55 to 3million years ago, or did they evolve from the extinct nine-million-year-oldIsurus hastalis, a shark that had no teeth serrations? Assistant Curator ofVertebrate Paleontology Dr. J.D. Stewart devised a research technique using theMu...

Sharks Get Porthole Of Opportunity

...his week to help stop overfishing of large coastal sharks in the Atlantic,based in part on scientific studie...evere restrictions, itwill take about 40 years for sharks to rebuild to one-half of their originalabundance. "The shark measures are tough and...

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