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Tag: "migratory" at biology news

Prey not hard-wired to fear predators

...ntrast , where wolves and grizzly bears were lost, migratory birds including warblers and hummingbirds were less abundant because moose over-browsed vegetation used by these migrants. “It is not just changes in climate or disease may alter our big remote wild landscapes, but so do the actions of conservationis...

New host species for avian influenza identified

...llance study, which included more than 36,000 wild migratory birds tested for low pathogenic avian influenza, d... geographical variation of avian influenza in wild migratory birds in Europe. Seven previously unknown host species for H5N1 were identified, including four spec...

NIAID expands capability for influenza research and surveillance

...llance covering all major domestic flight paths of migratory birds. This center also will carry out a human influenza surveillance study in Thailand and will monitor U.S. agricultural workers who work with swine. Emory University, Atlanta (principal investigator—Dr. Richard Compans) This center will condu...

Bats prey on nocturnally migrating songbirds

...and desert crossings already represent for fragile migratory passerines. Actually, the newly uncovered danger c...bstrates. The few species of falcons which capture migratory birds along the Mediterranean and African coasts are exclusively diurnal. Finally, owls, as typical ...

Out of Africa -- Bacteria, as well

... researchers to use H. pylori data to work out the migratory movements of modern man. "The parallels between the spread of man and of H. pylori are truly astonishing," says Achtman. "This bacterium could help us attain further information on aspects of human history that are still hotly disputed today if we an...

Recently discovered species gain protection

...ation of the rapidly declining cerulean warbler ?a migratory songbird that nests in North America. "The area is such a remarkable center of micro-endemism that scientists believe more species may be there waiting to be discovered," said Claude Gascon of Conservation International, who is co-chair of the IU...

Turtles are loyal in feeding as well as in breeding

...pear to be as loyal to specific foraging sites and migratory routes as they are to nesting sites. Published tod...ings strengthen the case for the protection of key migratory and foraging areas. We have shared our findings with the Libyan authorities and are encouraging them...

Some butterflies travel farther, reproduce faster

... selecting for genes that enhance the dispersal or migratory capability of animals when we fragment the landscape," Fescemyer said. The animals best able to migrate are more likely to survive and reproduce. "What we learn could apply to any organism that has to move to find food," he added Åland Islands are...

Newly discovered behavior in cancer cells signals dangerous metastasis

... permanently from stationary epithelial cells into migratory mesenchymal cells in order to metastasize. The Duke team discovered that highly malignant cells are equal parts epithelial and mesenchymal, transitioning between the two as their surroundings necessitate. The proteins that the cell produces dictate ...

Innovative movies show real-time immune-cell activity within tumors

... with tumor cells, and could not sustain an active migratory behavior within tumors." "There are several significant conclusions from these experiments," Weninger says. "First, it is now possible to visualize the behavior of the individual cellular components of the tumor microenvironment in real-time. Secon...

Race to halt global amphibian crisis boosted by rediscovery of endangered Colombian frogs

...s a vital stopover point for declining neotropical migratory birds that breed in the United States and Canada, such as the Cerulean and Golden-winged Warblers. Fundación ProAves staff at the reserve and Magdalena University researchers found the two rediscovered frog species while conducting research funded b...

Dragonfly migration resembles that of birds, scientists say

...g the 25 to 50 species of dragonfliesthought to be migratory among about 5200 species worldwide. The team of researchers that made the discovery, led by PrincetonUniversity's Martin Wikelski, tracked the insects for up to 10 days fromboth aircraft and handheld devices on the ground.They found that the dragonf...

Light guides flight of migratory birds

... failed to resolve the fundamental question of how migratory birds integrate multiple sources of directional in...polarized light. Muheim and Phillips argue that migratory songbirds average the sunrise and sunset intersections of the polarization band with the horizon to ...

How satellite tracking revealed the migratory mysteries of endangered Atlantic loggerhead turtles

...led by the University of Exeter have uncovered the migratory secrets of endangered loggerhead turtles in West Africa and the results could have huge implications for strategies to protect them. In a paper in the journal Current Biology, Dr Brendan Godley and an international team describe how they used satell...

Northern birds are fatter!

...t quality and the importance of specific sites for migratory birds, and this can contribute to decisions about whether migratory sites are protected and which sites are prioritised for protection", explains Williams. Two techni...

Marrow-derived stem cells deliver new cytokine to kill brain tumor cells, offer protection

...y challenging because of their highly invasive and migratory characteristics," said Keith L. Black, M.D., director of the Maxine Dunitz Neurosurgical Institute, director of Cedars-Sinai's Division of Neurosurgery, and co-director of the Comprehensive Brain Tumor Program. "By combining the tumor-tracking proper...

Crucial site for endangered frogs and birds saved

...s a vital stopover point for declining neotropical migratory birds that breed in the United States and Canada, such as the Cerulean and Golden-winged Warblers. All three conservation groups ?ABC, CI, and Fundación ProAves ?are among the 55 members of the Alliance for Zero Extinction (www.zeroextinction.org). ...

Scientist warns of threat to last stronghold of endangered turtle

..., to tag and track the animals, will uncover their migratory secrets and provide the basis for efforts to safeguard them. After fitting them with satellite trackers the team are using the internet to follow their journeys, which are among the longest in the animal kingdom. Dr Brendan Godley, of the Universit...

For some young fish, early gene expression is a clear harbinger of fated lifestyle

...fect their future: whether to adopt a sedentary or migratory lifestyle. Sedentary (or "residential") individu...s remain in the region of their birth, while their migratory compatriots set forth on long open-water journeys. The developmental choice of the residential versu...

Avian influenza virus in mammals spreads beyond the site of infection to other organ systems

...rds and spreads easily due to the agricultural and migratory nature of the bird species infected, including poultry, water fowl, and other migratory species (See commentary by Brown for more information). While spread of avian influenza from bird t...

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