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Tag: "nest" at biology news

Introduced foxes transformed vegetation on Aleutian Islands from lush grasslands to tundra

...re are about 26 species of seabirds that regularly nest on the islands, he said. They include surface nest... nests; and crevice nesters, such as auklets, that nest in boulder piles and rock crevices. According to Byrd, surface nesters and burrow nesters tended to...

Rats infected as newborns grew up vulnerable to memory problems during an immune challenge

...implications for survival, for example remembering nest sites, food sites and predator vicinities, as well as for fitness, for example remembering territories and potential mate locations." Bilbo stresses that adults rats who were not infected as pups do not suffer memory impairment as the result of adul...

Looks matter to female barn swallows

...l to her mate. Sometimes males even rear an entire nest of illegitimate young. After all pairs had laid their first set of eggs, Safran removed the eggs so that the females would mate again. Before the females chose their mates for their second nest, Safran captured the males and randomly assigned them t...

Ants win a waxy race

...nning up and down the stem, in order to access its nest and food supply inside the stem. Tanja Bruening and Holger Bohn from the University of Wuerzburg, Germany are presenting their work on ant-plant partnerships at the Society for Experimental Biology Annual Main Meeting in Barcelona [session A 7.68 an...

Industrial contaminants spread by seabirds in High Arctic, new Canadian study shows

...airs of birds called northern fulmars. The fulmars nest on the high cliffs, which are ringed by a series of freshwater ponds at their base. Although environmental monitoring in High Arctic locations is often very difficult due to logistical difficulties, lake sediments archive important information on env...

Ants, not evil spirits, create devil's gardens in the Amazon rainforest, study finds

..., M. schumanni provides its colonies with abundant nest sites--a long-lasting benefit, as colonies can liv... establishment of D. hirsuta, thereby gaining more nest sites." The plants also benefit by increasing their biomass and eliminating the competition, says c...

DNA from feathers tells tale of eagle fidelity

... her doctoral thesis. "Collecting feathers at the nest site helped us determine population parameters we wouldn't have been able to otherwise," she said. Those parameters, such as yearly survival rates and ratios of males to females, help conservation biologists monitor populations of rare or endangered...

The ecological effects of the Chernobyl disaster

... swallows are long-distance migratory birds, which nest across Europe, providing researchers with numerous populations to sample. Examining swallows from the Chernobyl region and Kanev, southeast of Kiev, Mousseau and his colleague, Anders Moller (Laboratorie de Parasitologie Evolutive, France), found rep...

Removing egg from nest may help save endangered whooping crane

...moving an egg from the endangered whooping crane's nest increases the species chances of survival despite ...one egg away actually increases the probability of nest success. His paper--co-authored by Subhash Lele from the U of A's mathematical and statistical scien...

Overfishing may drive endangered seabird to rely upon lower quality food

...s of reproductive success. "You'd expect birds to nest every year, but we found that in some years, as many as 90 percent of the murrelets we were studying weren't nesting," said Beissinger. "Even in the good years, only 50 percent of the seabirds were nesting, and for those that did, many nests failed f...

Primates harvest bee nests in Ugandan reserve

...abitat, humans and chimpanzees are the primary bee nest predators. Robert Kajobe of the Dutch Tropical Bee Research Unit and David Roubik from the Smithsonian Tropical Research Institute report this finding in the March, 2006 issue of Biotropica. Batwa Pygmies, who have traditionally harvested honey f...

Penguins okay with human visitors?for now

... simple and straightforward." Magellanic Penguins nest in coastal colonies along the southern Atlantic and Pacific oceans of South America. The penguins in the study live in the largest and most visited colony of Magellanic Penguins at Punta Tombo, Argentina. More than 70,000 people now visit annually....

Taking a bite out of a fellow worker helps wasps recruit new foragers

...te you to communicate that it is time to leave the nest and forage for the colony, according to research b...r nests. A day later, all foragers returning to a nest were removed for at least two hours and until none arrived for at least one hour of continuous monit...

Honeybee decision-making ability rivals any department committee

...osen home. offered bees both mediocre and superb nest sites. The better the site, the longer the bees waggle danced -- making 100 circuits for a first-rate site versus 12 for a mediocre one. The swarms almost always chose the excellent site. To test whether the bees decide by quorum or consensus, the re...

First demonstration of 'teaching' in non-human animals

...n as 'tandem running' to lead another ant from the nest to a food source. Signals between the two ants control both the speed and course of the run. It is believed to be the first time a demonstration of 'formal' teaching has been recognised in any non-human animal. This behaviour indicates that it could...

Leave it to salmon to leave no stone unturned

...keye for the last 50 years and previously measured nest sizes, Moore calculates that every summer the sockeye disturb at least 30 percent of the stream beds of two Alaskan streams he studied. And in years when salmon populations are high, sockeye dig up entire stream beds more than once, being forced to ...

Scientist warns of threat to last stronghold of endangered turtle

... help protect endangered leatherback turtles which nest in Gabon, West Africa. The region is thought to be the animals' last global stronghold, as pacific populations dwindle precariously. It's hoped the project, to tag and track the animals, will uncover their migratory secrets and provide the basis for...

How low can you go? Ants learn to limbo

...ntal barrier placed between the food and the ants' nest using high speed video recordings from the side. They then tracked the ants' movements and did a kinematic analysis of the results. ...

A dichotomy in migration patterns found for sea turtles in east Atlantic

... a large population of loggerhead sea turtles that nest on the Cape Verde islands off of West Africa, researchers have found an unexpected dichotomy in turtle behavior: While some turtles leave the nesting grounds to feed on bottom-dwelling sea life in shallow coastal waters, others leave Cape Verde to ro...

All the eggs in one basket

...crease green and hawksbill turtle populations that nest on protected beaches. However, they argue that dwindling turtle populations on many historically important nesting beaches are overlooked by conservation assessments that focus instead on the few large nesting sites that remain. The study, "Conserva...

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