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Tag: "predators" at biology news

Ocean 'dead zones' trigger sex changes in fish, posing extinction threat

...n die. Those that escape may be more vulnerable to predators and other stresses. This new study, Wu says, suggests these zones potentially pose a third threat to these species ?an inability of their offspring to find mates and reproduce. The researchers found that low levels of dissolved oxygen, also known a...

Predators keep the world green, ecologists find

...red from small islands, including fruit eaters and predators of vertebrates, leaving a hyperabundance of genera...aging in many countries over reintroduction of top predators such as wolves. "The take-home message is clear: the presence of a viable carnivore guild is fundame...

Primates harvest bee nests in Ugandan reserve

...of honey-making bees and the role of their natural predators in this ecosystem. Nothing is known about the amount of honey produced in nests of different species. Nothing is known about how often bee species found new nests. Unfortunately, this dearth of information about native bees will continue unless mo...

Pretreating rogue cancer cells with aspirin cripples their resistance to targeted therapy

...ted islands following the introduction of invasive predators such as cats and rats. This study shows that the extinction crisis has now expanded to become a full-blown assault on Earth's major land masses, with the majority of at-risk sites and species now found on continental mountains and in lowland areas. ...

New study pinpoints epicenters of Earth's imminent extinctions

...ted islands following the introduction of invasive predators such as cats and rats. This study shows that the extinction crisis has now expanded to become a full-blown assault on Earth's major land masses, with the majority of at-risk sites and species now found on continental mountains and in lowland areas. ...

Research: Snails were overlooked contributors to marsh destruction

...with other recent studies highlighting the role of predators or other top-down animals. "This study adds to a growing body of evidence showing strong top-down regulation of ecosystems processes, including sharks in the Gulf of Mexico and wolves in Yellowstone Park," Silliman said. Native and abundant, dime- ...

Sea slug mixes chemical defense before firing at predators

... insures the secretion's potency against attacking predators to enable sea slugs to escape." Aplysia employs a...ponent and also are attempting to identify Aplysia predators which are affected by this property of the secretion. "The antimicrobial property probably evolved ...

Wild Gorillas Handy with a Stick

...jects for many tasks, from intimidating rivals and predators to taking leaf sponge baths and processing food. Still, the notion that tool use was not the sole province of human intelligence was difficult for some to accept. Though chimps, bonobos, orangutans, and gorillas all use tools in captivity, often imi...

Fish evolve a longer lifespan by evolving a longer reproductive period, researchers find

...pies living in environments with a large number of predators have adapted to reproduce earlier in life than guppies from low-predation localities. Moreover, when reproduction ceases, guppies from high-predation localities are far older, on average, than guppies from low-predation localities, indicating that hi...

U. of Colorado researcher identifies tracks of swimming dinosaur in Wyoming

...raction between these slow-moving, bottom-dwelling predators and crinoids is a long one," he said, "and that it may have been connected in some way to pushing crinoids into developing these defensive strategies." ...

Creeping crinoids! Sea lilies crawl to escape predators, new video shows

...raction between these slow-moving, bottom-dwelling predators and crinoids is a long one," he said, "and that it may have been connected in some way to pushing crinoids into developing these defensive strategies." ...

Wolves' top-down effect

...y of Alberta) and colleagues. Top-down effects of predators are called trophic cascades. While studies have demonstrated this phenomenon in aquatic environments, the Hebblewhite et al study is one of the first terrestrial, large-scale studies that so clearly exemplifies the strong role played by a top predato...

Proposal would allow wild animals to roam North America

...ere beavers have declined. Similarly, after major predators became extinct in Montana and Wyoming, the number of moose, which eat willows, increased in the Yellowstone National Park area. The loss of willows has negatively impacted the numbers of nesting migrant songbirds. ...

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

Basking sharks are much more canny predators than previously thought, ecologists have discovere...his behaviour in an attempt to throw some of their predators (eg fish larvae and predatory invertebrates such as arrow worms) off their trail. However, this stud...

Scientists discover global pattern of big fish diversity in open oceans

...ng in formerly productive areas. If we allow these predators some reprieve, we could rebuild some of the lost biodiversity. "Our paper suggests there is a solution ?while some hotspots have already disappeared, there are still some very special places where species concentrate," says Worm. "We have the chance...

Bugs, even 'bad' ones, can be educationally beneficial, new book says

...d. Biological control, a practice in which natural predators are introduced, is a more creative and effective way to control pests, he said. In the book, Waldbauer explains many historic and recent examples of how people control pests without insecticides. For example, in 1886, the cottony cushion scale (Icer...

Alarm pheromone causes aphids to sprout wings

...ticated than expected. When aphids are attacked by predators such as ladybird beetles, they release an alarm pheromone, (E)-â-farnesene, that has long been known to cause other aphids to walk around or drop from the plant. In a paper soon to appear in Ecology Letters, researchers at the University and Max-Pla...

What the eye doesn't see

...ans operate in a similar way to those in non-human predators such as birds. ...

Super predators and mass extinctions

...oland thinks it may be possible that extraordinary predators are at fault instead. Adam Lipowski (Adam Mickiew..., the system is populated with "medium efficiency" predators whose numbers fluctuate only slightly as the prey population waxes and wanes. Inevitably, their stab...

Great White shark evolution debate involves WSU Lake Campus geology professor

...ssue is if the Great White, one of the most feared predators of the sea, evolved from the huge prehistoric megladon shark or if its ancestry rests with the mako shark. "Most scientists would probably say the Great Whites evolved from the megladon line, which existed from two million to twenty million years ag...

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