Tag: "prey" at biology news

Tracing genes, biologists show lizard migration is traced to Florida

...wn lizard size. And the brown lizards have become prey to the Nile Monitor, a seven-foot-long lizard native to Africa, but also introduced in Florida, most likely a refugee from a pet store or hobbyist who wanted a unique pet. "The green lizard populations are being reduced in Florida, especiall...

New fossil sheds light on old mystery

...f a unique and very effective method for capturing prey in water. Dinocephalosaurus orientalis, which mean...ry, and any movement toward it not only alerts the prey of an attack but also creates a pressure wave that could push the prey away. Fish and some turtles c...

A long-necked sea predator from China described in Science

...e to sneak up and lunge at a fish or other aquatic prey in murky near-shore waters before the predator's f...of hunting in water, a dense medium that can alert prey to a predator's presence long before it strikes....

Blue marlin in gulf have high mercury levels, A&M study shows

...rlin may have more mercury because they eat larger prey and live longer than other fishes," Rooker explains. "Still, the story appears to be more complex and we are in the process of examining other large pelagic fishes, and comparing our results to blue marlin." Rooker says that preliminary data show fis...

Serotonin metabolites in mollusks suggest pathways for human therapies

...arly for feeding," Gillette said. "Some potential prey have dangerous, stinging defenses. In a single encounter, Pleurobranchaea learn to avoid their odor, Pleurobranchaea learn to avoid it by doing a characteristic avoidance turn during subsequent encounters. We are working with the serotonin pathways...

In a world of distortion, archer fish learn to judge absolute size of aerial prey

... for animals that need to judge the size of aerial prey from an underwater vantage point. Here, as the study of Schuster and colleagues shows, the complex optical situation arising from distance and refraction requires precise understanding of the relationship between an object's apparent size and the fis...

Broken arms and collateral damage: clues to predator-driven evolution

...Biologists long have speculated that predators and prey play a game of evolutionary one-upsmanship, in whi... finding evidence of changes in both predators and prey doesn't prove that one caused the other, Baumiller noted. "You have to provide evidence that they, i...

Computer models expose humans as main cause of caribou decline

...er of wolves (a caribou predator), moose (the main prey of wolves), and edible vegetation in the area. As well, a "natural" model--the ecosystem as it would be without any humans and thus no industrial development--was created, as was a "business as usual" model, with no changes from current conditions. ...

Evolution of whale hearing unfolds in fossil record

... say scientists, because these whales locate their prey using echolocation. Directional hearing is critical: A blind such whale could find food without much trouble; a deaf one would starve. The study documents how hearing in these whales evolved. The research is based on cetacean fossils representin...

Excess levels of nitrogen, phosphorus linked to deformed frogs

...r missing limbs. This deformed frog is then prime prey for wading birds, such as herons or egrets, which the parasite needs for sexual reproduction. As for the snail, it wouldn't be so abundant in these ponds were it not for run off of nitrogen and phosphorus found in agricultural fertilizers an...

Gulf of Maine marine ecosystem may have entered new phase

...er able to perform their function of keeping their prey species in check, the ecosystem entered a new phase marked by abundant sea urchins and a lack of kelp beds. Urchins ate so much kelp that they created areas known as "urchin barrens" where only low growing algae could survive. In turn, the ha...

Study finds anti-HIV protein evolved millions of years before the emergence of AIDS

...logical interests come head to head. Predators and prey often influence the evolution of one another, and the same can happen between viruses and proteins of the cells they infect. "We don't always know what the conflict is, but by looking for proteins that are rapidly evolving in response to selective pr...

New paper in Science introduces revolutionary new paradigm for fishery management

...loser attention to the entire food web, such as to prey species critical to the endangered Steller Sea Lion in Alaska, and to bycatch (non-targeted species) such as white marlin, which has been inadvertently decimated because of tuna and swordfish fishing. "Overfishing top predators like marlins is dange...

Climate may play role in lynx's hunting ability

...related that would influence the lynx's ability to prey on snow hares and their propensity to move between regions." In a paper published today in the Proceedings of the National Academy of Science, part of a series of papers already published, the team demonstrated that different snow conditions may, in ...

Releasing pet fish into the wrong ocean proves a diaster

...ina to New York. In their native habitat, lionfish prey on a wide variety of fish, shrimps and crabs. "Introduction of the lionfish is an ecological quantum leap for local fishes that have no experience dealing with this voracious predator," Semmens says. Walter Courtenay, a research fishery biologist w...

Rare, tiny find in West Australian waters

...ds from ocean algae to tiny shellfish. It consumes prey in the same manner as a spider, remineralising part of the 'ocean snow' and helping to sustain other small forms of marine life. Ms Paterson has searched the scientific literature and believe this is the first sample to be found in the Southern Hemis...

Laos camera traps capture tigers

...untjacs is important for tigers that rely on these prey species." Another goal of the tiger survey is to determine the frequency and nature of large carnivore attacks on livestock in Nam Et Phou Louey, located in the country's northern highlands. Once sufficient data are gathered, Johnson and her...

Monkey business: Studies show tiny callimicos have unusual characteristics

... (a weasel-like mammal), eagles and other raptors, prey upon the shy primate. Callimicos are so timid that Porter only was able to observe them for a total of about one minute during her first three-month trip to Bolivia. However, more extended fieldwork enabled her to make more extensive observations. ...

Study probes ecosystem of tree holes

... some protozoans are bigger than rotifers and will prey upon them. Mosquito larvae browse and filter-feed and will attack either of the groups of species. 'It's war inside a tree hole," Kneitel said. "We found that predation has the strongest effect when there are no disturbances. Disturbance h...

Viruses clear bacterial contamination in chickens

... "In nature a balance exists between predator and prey which allows both [the bacterium and the bacteriophage] to flourish. Here the use of bacteriophage to reduce campylobacters within the chicken gut merely involves shifting nature's balance in our favor for a short period of time. This time point sho...

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