Tag: "prey" at biology news

Peregrine falcons may face new environmental threat

...ety. Aerial predators that can power-dive on their prey at speeds up to 200 mph, peregrine falcons approac...l concern for a bird that relies on surprising its prey and diving on it. Two BDE forms the penta and octa versions will be banned in member states of the...

Pest control breakthrough from a spider's stomach

...alyse the content of spiders' guts to identify the prey they have eaten in the field. Money spiders or Li... controller of pest numbers on farms because their prey includes aphids. However, aphids have poor nutritional value and are sometimes toxic, so the spiders...

Study unearths cliques in the food web

...lving." Predators are likely to have more than one prey and prey are likely tohave more than one predator, thereby creating a web of interactions, nota chain. A com...

Mantis shrimp fluoresce to enhance signaling in the dim ocean depths

...re so dangerous. Mantis shrimp spear or club their prey and have been known to break aquarium glass with their heavy, calcified clubs. They can easily kill an opponent with a single, well-placed blow, Caldwell said. Another explanation is that, because they have small brains, complex visual processing mus...

It's feast or famine: Predators may drive lemming cycles, Science researchers say

...ich lives in the high-arctic tundra, is the single prey in one of the world's simplest vertebrate predator...ralists have turned to alternative, more plentiful prey or left the area, the lemmings can multiply fast enough to reach their peak once again. To test thei...

New medicines at risk from biodiversity loss

...al seas. They defend themselves and paralyze their prey worms, fish, and other molluscs by injecting a cocktail of toxins through a hollow, harpoon-like tooth. Each species has its own distinct set of around 100 'conotoxins', which like a gourmet chef it mixes in constantly changing proportions, thereby...

Scientists estimate risk of raven predation on desert tortoises

...e more than one pattern of predation can put their prey at a greater threat of extinction," said Boarman. ...nting young desert tortoises, which are vulnerable prey up to about age 5 or 6 because they cannot easily escape predators and they have soft shells that a ...

Species vs. Species

...e Island are critically endangered, the foxes that prey on their nestlings should be controlled. Right? Wrong. The problem is that the foxes are also at-risk. A new analysis shows that instead of pitting the shrike against the fox, both species could have been protected with an ecosystem-wide conservation...

Bones from French cave show Neanderthals, Cro-Magnon hunted same prey

...nce indicates there was no major difference in the prey hunted by Neanderthal and Cro-Magnon, according to... roe deer, horses and chamois were the most common prey were the mainstay of humans in this part of the world, according to Grayson. He and Delpech fou...

Collapse of seals, sea lions & sea otters in North Pacific triggered by overfishing of great whales

...e paper's eight authors argue that this removal of prey forced some killer whales to seek alternative sources of food. Beginning with harbor seals (populations collapsed early 70's - early 80's) then fur seals (mid 70's - mid 80's), sea lions (late 70's - 90 's) and finally sea otters (90's - today), the...

Watching social behaviour evolve

...perate to swarm across solid surfaces in search of prey organisms which they hunt and kill together like a wolf pack. Moreover, when they encounter starvation conditions, groups of up to 100,000 individuals M. xanthus cells aggregate together to construct three-dimensional fruiting structures in which str...

Studies probe rapid evolution of Chinese tallow trees

...should exhibit lowered insect defenses and be easy prey for insects. But, when protected from insects, the invasive North American varieties should outperform the Asian varieties. Next month, Siemann's group will be awarded a three-year $195,000 grant from the USDA for a comparative analysis of tallow tre...

Parasites prevent ants from protecting coffee plants

...orids in the system cascades down to affect Azteca prey via their interactions with Azteca ants," Philpott said. "The phorids, however, may also affect how Azteca interact with other species of ants or with other predators such as spiders, with potentially more widespread effects in coffee agroecosystems....

Researchers: Fire may help combat fatal dogwood epidemic

...n increases the availability of these organisms as prey to birds or other animals. Dogwood berries, which are high in protein, also are an important food source for birds, Jenkins said. "We've found that what replaces dogwood in the park is hemlock, which is not a food source for birds, although it is a g...

Waiter, there's a shark in my soup

...s and other coastal shark species that have fallen prey to overfishing in recent decades....

Study shows enzyme helps guard against Alzheimer's disease

...unction normally, and to prevent them from falling prey to age-related neurodegeneration. "Our findings showed that Pin1expression inversely correlates with neuronal vulnerability to degeneration in normal brains, and with the actual formation of tangles in patients with Alzheimer's," says Lu. "Furthermor...

Whale populations are too low to resume commercial hunting, geneticists find

... apparent. "Sharks and killer whales are known to prey upon humpback whales, and their demise likely had a big effect on those predators as well," Estes noted. "So the implications of the Roman-Palumbi study for ocean conservation are startling. It could entirely redefine our recovery criteria for whale...

Amphibians' life stages influence contaminant transfer from aquatic to terrestrial environments

... aquatic and terrestrial systems and are important prey items in the diets of birds and reptiles, according to Hopkins. He said body burdens of some contaminants, such as selenium and strontium, are retained through metamorphosis and they may be transferred into terrestrial food webs from wetland systems...

Rapid evolution helps hunted outwit their predators

...ife, when hordes of well-fed predators drive their prey to the brink of extinction, sometimes evolution ta...ad noticed that the highs and lows of predator and prey populations in the chemostats were occurring completely "out of phase," says Yoshida. When rotifer p...

Dodging elephants, scorpions, mudslidesUF researcher tracks tigers

... understanding of the dynamics of tigers and their prey and, for the first time, given us a holistic picture of tigers living in the rain forest," said John Seidensticker, a research scientist at the Smithsonian's National Zoological Park in Washington, D.C., and chairman of ExxonMobil's Save The Tiger Fu...

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