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Tag: "sharks" at biology news

New research shows sharks use their noses and bodies to locate smells

...research from Boston University marine biologists, sharks can not use just their noses to locate prey; they ... This produced four separate smell targets for the sharks to locate. "In addition, we also tested the sharks under two light conditions – fluorescent and ...

Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply

Fewer big sharks in the oceans mean that bay scallops and other she...ate, and small shark prey species. "With fewer sharks around, the species they prey upon ?like cownose rays ?have increased in numbers, and in turn, horde...

Triple threat: World fin trade may harvest up to 73 million sharks per year

The first real-data study of sharks harvested for their valuable fins estimates as few as 26 million and as many as 73 million sharks are killed each year worldwide--three times higher than was reported originally by the United Nation...

Ongoing collapse of coral reef shark populations

... the December 5th issue of Current Biology. Reef sharks are so-called apex predators on tropical coral ree... reef ecosystems. The reproductive biology of reef sharks makes them particularly vulnerable to fishing, but until now, there have been no studies of the resp...

Creating a window on 'oceans in motion'

...f other fish species, including sturgeon, halibut, sharks and tunas. Among other benefits, the array techno... new array in Prince William Sound to track salmon sharks in the northern Gulf of Alaska region. And he says partners to track marine animals and the state o...

UF scientists trace origin of shark's electric sense

...ignal of a flounder buried under sand." Likewise, sharks are widely thought to use the Earth's magnetic fie...s olfaction, hearing, vision and touch, this shows sharks took a pre-existing genetic program and used it to build yet another type of sensory system," Cohn s...

How marine reserves are giving coral reefs a helping hand

...and and Sea Park was fun because a large number of sharks turned up to watch us work. Sharks have been heavily fished on most coral reefs so it's always a thrill to visit one of their sanctuaries." ...

World shark attacks dipped in 2005, part of long-term trend

... and in-your-face responses to confrontations with sharks went a long way in reducing the total number of at... were kept, he said. There also were simply fewer sharks to attack people, a result of a decline in populations caused by overfishing of the carnivorous crea...

High-tech tags on marine animals yield valuable data for biologists and oceanographers

...archers are enlisting seals, sea lions, tunas, and sharks to serve as ocean sensors, outfitting these top predators with electronic tags that gather detailed reports on oceanographic conditions and, in many cases, transmit the data via satellite. The data are proving useful to both biologists and oceanograp...

UF scientists reveal ancient origin of vertebrate skeleton

...volution that unites us with reptiles, amphibians, sharks and bony fishes, while the lamprey skeleton was based on quite different proteins," said Martin Cohn, Ph.D., a developmental biologist and associate professor with the UF departments of zoology and anatomy and cell biology. "Knowing that lampreys als...

Oceans are 70 percent shark free

...rs, led by the University of Aberdeen, reveal that sharks have failed to colonise at depths greater than 3,0...o around 9,000m depth. Scientists do not know why sharks are absent from the deep but suggest one possible reason could be due to lack of food. They warn ...

UF scientists reveal ancient origin of vertebrate skeleton

...volution that unites us with reptiles, amphibians, sharks and bony fishes, while the lamprey skeleton was based on quite different proteins," said Martin Cohn, Ph.D., a developmental biologist and associate professor with the UF departments of zoology and anatomy and cell biology. "Knowing that lampreys als...

Research: Snails were overlooked contributors to marsh destruction

...down regulation of ecosystems processes, including sharks in the Gulf of Mexico and wolves in Yellowstone Park," Silliman said. Native and abundant, dime- to quarter-sized periwinkle snails can often be seen hanging on cordgrass above the water line. Contrary to appearances, they don't actually eat the gr...

Plankton can run, but can't hide from basking sharks

Basking sharks are much more canny predators than previously thou...gical Society's Journal of Animal Ecology, basking sharks are able to reverse their normal pattern of diving at dawn and surfacing at dusk in order to foil th...

Agilent Technologies introduces advanced zebrafish, mouse microarrays for stem cell and developmental biology research

...r of wildlife and fishery sciences who has studied sharks for years. Worldwide, about one million people a year are killed in auto accidents, including more than 42,000 a year in the United States. McEachran goes on to note that far more people die each year - about 90 worldwide - from an allergic reactio...

New HIV drug candidate developed in Sweden

...r of wildlife and fishery sciences who has studied sharks for years. Worldwide, about one million people a year are killed in auto accidents, including more than 42,000 a year in the United States. McEachran goes on to note that far more people die each year - about 90 worldwide - from an allergic reactio...

Shark attack worries? Driving to the beach is more deadly

...r of wildlife and fishery sciences who has studied sharks for years. Worldwide, about one million people a year are killed in auto accidents, including more than 42,000 a year in the United States. McEachran goes on to note that far more people die each year - about 90 worldwide - from an allergic reactio...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...he ocean and back, bypassing hazards such as dams, sharks and fishermen. "In some species, all or a fraction of the individuals in some populations do not migrate to sea at all," he says. "These fish sacrifice the growing opportunities at sea for the relative safety of freshwater, and males are more inclin...

Great White shark evolution debate involves WSU Lake Campus geology professor

...rities with the mako shark." He added that because sharks regularly replace their teeth, it is relatively ea...as scary monsters," he explained. His interest in sharks is apparent when entering his office. The door and walls have pictures of shark teeth, and there are...

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