Tag: "predator" at biology news

A long-necked sea predator from China described in Science

...wake that would otherwise signal its approach, the predator may have executed almost undetectable strikes at unsuspecting fish. While it's difficult to add muscles to a fossil when there is little or no evidence for muscles in the fossil record, and even tougher when the fossil has no living counterpart, Rie...

New understanding of the machinery of flinching

...emselves against threats ranging from an attacking predator to an incoming golf ball. Researchers Michael Graziano and Dylan Cooke have shed new light on the neural machinery that controls flinching by dialing the response up or down using drugs. Their studies concentrated on a region of the motor cortex they...

New model explains why costly insect 'outbreaks' hard to predict

...iability of weather, the presence of more than one predator for each species and variability in the ability of insect larvae to resist disease. Taking into account so many dynamics yields a formula more complex and more useful than others that have been used to explain insect outbreaks. ...

Society for conservation biology conference

...ndia after careful study of their regions specific predator conflicts. Along the Laos-Vietnam border, tigers are attacking livestock from villages in and around a nationally protected area at a higher rate. In the Pauri Garhwal district of the Indian Himalayas, leopard attacks on humans have increased due t...

Study probes ecosystem of tree holes

...e associated with each of the treatments those in predator treatments were those tolerant of predators, those in disturbance treatments were tolerant of disturbances, and so on."Kneitel studied between 20 and 25 protozoan species and four rotifers; protozoans are single-celled organisms, rotifers, multi-cell...

Viruses clear bacterial contamination in chickens

...on the study. "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 ...

Traditional fishing destroys corals - new research

...fs would be relatively resilient to the impacts of predator removal. This study suggests this may not be the case and that even low levels of fishing may cause ecosystem meltdown. "We don't know how permanent the damage is without further research but as we were observing changes over two years it seems as th...

Catastrophic shift in species diversity and productivity of an ecosystem

...her plant species. Alteration of this control by a predator removal experiment caused rapid increase in the ab...ionary tale that ecosystem management which alters predator abundances even slightly may cause dramatic and irreversible shifts in the productivity and diversit...

Fishing kills Fijian coral reefs

...would be relatively resilient to the low levels of predator removal - this study suggests this may not be so. Maintaining high predator abundances across reefs will reduce the risk of starfish outbreaks....

The Hunter's Breath tells a story of adventure and discovery in Antarctica

...an hour. Learning what it takes for a top predator to survive in the ocean is critically important for conservation efforts, Williams said. "The problem now is we really don't know what big predators need to survive--not just Weddell seals, but dolphins, killer whales, sea lions--it's appall...

Predators and human health

... Holt (University of Florida) found that different predator types influence rodent populations in a range of ways, with some very effectively regulating rodent numbers while other predators actually cause periodic rodent population booms. Specifically, Ostfeld and Holt found that predators that are not pick...

Increased temperature may prevent winter flounder from rebounding in east coast estuaries

...temperature, for example, could be beneficial to a predator if the primary effect were to accelerate its level...res are the result of cold temperatures decreasing predator activity at low flounder densities, and conversely, shrimp maintaining high predation rates at low f...

USGS February science picks

...have shown feral cats to be the most damaging bird predator on Mauna Kea, but non-native rats and mongooses also prey on palila and their eggs. These predation pressures slow recovery of the endangered palila and other native Hawaiian birds. USGS scientists are developing techniques to help managers reduce th...

Declining sharks

...monstrate that the initial abundance of large apex predator populations, sharks, was enormously greater than is currently recognized. They estimate that since the onset of intense exploitation in the Gulf of Mexico in the 1950s, the pelagic shark assemblage has declined by over 80%, and the oceanic whitetip s...

A killer microbe as a living antibiotic

...he cell wall of the prey. Via a pulling motion the predator navigates itself in the "periplasmic space" between the outer and inner membrane of the prey cell. Bdellovibrio can remain encysted at this stage, while the entry pore has been sealed and the prey cell remains viable. Most commonly, however, Bdel...

Signal chemical primes plants for pest attack

...l control of pests in agriculture." However, these predator attracting chemicals do not appear immediately. The first chemicals released are green leafy volatiles (GLV), the odor of new mown grass or crushed leaves. These are highly volatile and appear immediately so they are good candidates as signals to o...

Scientist challenges interpretation of new find, the oldest primate fossil ever discovered

... length, Ni and colleagues maintain that the small predator was diurnal (active during the day). Dr. Martin, on the other hand, says there is no compelling evidence from the fossil to shake the traditional belief that the common ancestor of primates, and early representatives such as members of the genus Teil...

Aged roaches experience perils of stiff joints, find Case researchers

...had lacked the spontaneous response to flee from a predator in lab studies, but this escape behavior returned after the roach's head was removed, suggesting a deficiency in the brain. She noted that the importance of this study is that it stresses the importance of multi-level approaches to the study of age-r...

Non-lethal methods can resolve conflicts between bears and humans

...t from a high-powered rifle, but they also allow a predator to live--surely the goal of conservation," states Dr. John Shivik, of Wildlife Services' National Wildlife Research Center and Utah State University, the lead author of the study. Other authors included Peggy Callahan of the Wildlife Science Center....

Helping carnivores and people co-exist

...t from a high-powered rifle, but they also allow a predator to live surely the goal of conservation," say John Shivik of the United States Department of Agriculture, Wildlife Services, National Wildlife Research Center and Utah State University in Logan; Adrian Treves, who did this work while at Conservation...

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