Sentences with phrase «bird populations with»

«Once we find the Mhc, we'll compare its frequency in current bird populations with birds before the epidemic,» says Edwards.

Although the technique is still in the proof - of - principle stage, it «could be an immensely powerful tool in implementing conservation measures for the most at - risk bird populations with fine - scale precision,» says Jeff Wells of the Boreal Songbird Initiative in Seattle, Washington.

Not exact matches

@mariska — No, in many populations, especially birds, there is a percentage that is EXCLUSIVELY attracted to the same gender and will never mate with the opposite gender in their lifetime.

They used information on birds and trees in landscapes with different levels of production output to project how different species» population sizes would respond to different ways of using the land.

With the exception of the guests of the island's small number of hotels, the population seems largely to consist of the graceful Fregata magnificens, or frigate bird.

One of the ways you can do your bit for the bird population, is by feeding them all year round with the family.

The Bobolink Project is back, refreshed, refocused — and expanded — with its collaborative and economically innovative strategy to restore fading populations of the once - familiar birds of hayfields and meadows.

For the fourth time, Shedd Aquarium, a leader in animal care and conservation, has teamed up with the South African Foundation for the Conservation of Costal Birds, SANCCOB, a non-profit that works to reverse the decline of seabird populations through the rescue, rehabilitation and release of ill, injured, abandoned and oiled seabirds.

In the new study, led by graduate student Steven Briscoe, the team found that other populations of neurons in the bird DVR share molecular signatures with neocortical intratelencephalic cells, or IT neurons.

Once La Niña comes around, disparate bird populations start to mingle again, increasing the likelihood that a carrier is infected with more than one variety of the virus.

The problem drove bald eagles, our national symbol, not to mention peregrine falcons and other bird populations, to the brink of extinction, with populations plummeting more than 80 percent.

On other islands with large populations of birds, those birds might help to keep their islands crab - free by eating juvenile coconut crabs, preventing them from colonizing there.

ANU research predicted the population of the birds will halve every four years, with a possible decline of 94.7 per cent over 16 years.

The effects of waste on larger animals, including birds with stomachs full of plastic, have garnered significant attention, he says, but «when you start altering [whole] populations,... that's when you get these true impacts.»

Bird population crashes seem to correlate with the strange 13 - year and 17 - year cycles of periodical cicadas.

Some of the variation the researchers found likely dates back to isolation of different Hermit Thrushes populations by ice sheets during the Pleistocene era, while differences between the two western groups may relate to body size, with larger birds producing lower - frequency songs.

Because adult cardinal songs exist as different dialects in different geographic regions, dispersing juvenile birds may land in a population with a foreign dialect.

In the captive populations, the birds also had strong associations with one or two other individuals, numerous more moderate relationships, and only a few that were weak.

Some closely related species interbreed where their ranges overlap, producing hybrid offspring that can even backcross with either parent species, until a whole population of mixed - species birds forms in the area and creates what's known as a «hybrid zone.»

In the early stages of plant regeneration, plants benefit from the interaction with animals: bees pollinate flowers and maintain gene flow among plant populations, while birds disperse seeds that can establish as seedlings at new locations.

«This ongoing study provides us information about these unique birds that was essentially lost when the populations disappeared in the wild and will help us with our ongoing efforts to recover this species.»

The key result of the study is that with longer dry seasons and more intense seasonal drought, there is an overall negative effect on bird populations.

When combined with other surveys such as the Breeding Bird Survey, it provides a picture of how the continent's bird populations have changed in time and space over the past hundred yeBird Survey, it provides a picture of how the continent's bird populations have changed in time and space over the past hundred yebird populations have changed in time and space over the past hundred years.

The arrival of humans to this island, however, depleted its population and it ended up going extinct, as was the case with numerous bird species on other islands, such as the Canaries and Madeira.

The study, published in the journal Behavioural Ecology and Sociobiology, combines mathematical modelling with an analysis of population changes in 221 bird and 43 bumblebee species worldwide.

It accounted for more than a quarter of all birds in North America, with an estimated population of 3 billion to 5 billion.

Instead, the double whammy of an already natural population decline coupled with the pressures of hunting and population loss may have done the bird in, Hung and colleagues report online today in the Proceedings of the National Academy of Sciences.

Professor Sherwin, of the UNSW School of Biological, Earth and Environmental Sciences, said the advantageous mutation then spread rapidly through the population, with the proportion of birds carrying Haplotype H increasing from 17 per cent to 47 per cent during the five years of the study.

They analyzed 15 different locations in the birds» DNA and found that it's likely that the Kapiti Island population, which at some 1200 birds is by far the biggest, is losing some of its precious genetic variation with every generation, for reasons that are unclear.

Genetic differences between the two populations suggested that natural selection, the process that drives evolution, appeared to be at work especially in DNA regions associated with the shape and structure of the birds» beaks.

The three other populations that the researchers studied are also losing genetic variation — and they didn't have much to begin with, because each was founded by a small number of Kapiti birds, the scientists report online today in the Proceedings of the Royal Society B.

William Sutherland, a population biologist at the University of East Anglia, has shown that the places on Earth with the most biodiversity are the most linguistically diverse as well and that languages are even more at risk for extinction than are birds or mammals.

In particular, the researchers found that a gene variant, COL4A5 - C, associated with longer beaks in both populations was more abundant in the U.K. birds.

Compared with fishes, frogs, reptiles, and birds, some of which can regrow entire brain structures, he says, «it is interesting that neuronal turnover in humans is limited to a single population of neurons in only one relatively small structure, and it is worthwhile to examine why it persists.»

Some closely related species interbreed where their ranges overlap, producing hybrid offspring that can backcross with either parent species, until a whole population of mixed - species birds forms in the area and creates what's known as a «hybrid zone.»

The passenger pigeon was once the most abundant bird in the world, with a population size estimated at 3 — 5 billion in the 1800s; its abrupt extinction in 1914 raises the question of how such an abundant bird could have been driven to extinction in mere decades.

Other scientists have interpreted this as bird and butterfly populations keeping pace with climate change by favouring species that can best tolerate warmer conditions.

Scientists have long wondered why a bird with such a large population, only decades before its extinction, disappeared so quickly and so completely, without leaving even a small population behind.

There are shallow coves all over the lake, where huge turtles live, and at the swampy end, with its high reeds and grass, the bird population is extraordinary.

The study claims cats kill birds and mammals with abandon, and that trap - neuter - return — the nationally popular and humane program to stabilize and reduce the population of unsocialized (unadoptable) feral cats — isn't working.

Nevertheless, Mead concludes, «there is no clear evidence of cats threatening to harm the overall population level of any particular species... Indeed, cats have been kept as pets for many years and hundreds of generations of birds breeding in suburban and rural areas have had to contend with their predatory intentions.»

Such aggregate figures can typically be traced to small — often flawed — studies, the results of which are subsequently extrapolated from one habitat to another, conflating island populations with those on continents, combining common and rare bird species, and so forth.

«So let's stabilise the population in Tasmania, and have the scientists research whether it is good for the Tassie devil and good for the broader native Australian population with regards to native birds, native mammals on the mainland.»

If any thing else urbanization probably increases the cat population by a little along with huge increases n pollution, traffic, buildings, boys with bee bee guns, pesticides, Urbanization also has the nasty side effect of decreasing natural resources for all species of wild life including birds.

Any individual or organization that promotes TNR or other methods of dealing with feral cats while letting them remain outdoors is promoting the decline of native populations of birds and small animals and then the eventual EXTINCTION of same.

Impacts of Free - ranging Domestic Cats (Felis catus) on birds in the United States: A review of recent research with conservation and management recommendations (2009) HAHF cites the 2009 paper co-authored by former Smithsonian researcher Nico Dauphiné (who resigned after being found guilty of attempted animal cruelty last year, after rat poison was found in cat food outside her apartment building) as evidence of «the incredible impact of free ranging cats on the bird populations of the U.S.» Among the many flaws in «Impacts of Free - ranging Domestic Cats» was the authors» estimate of «117 to 157 million exotic predators,» which was based on David Jessup's inflated (and, not surprisingly, unattributed) «estimate» of «60 to 100 million feral and abandoned cats.»

Counting Cats and Counting Birds In both studies, the authors quantified the impact of cat predation on bird populations by comparing different levels of predation with different bird densities.

Merging the estimates of cat populations with a range of estimates for kill rates, the researchers concluded that cats kill 1.3 to 4 billion birds and 6.3 to 22.3 billion mammals annually.

Recent research suggests that collisions with buildings and communication towers have no significant effect on bird populations.

While I disagree with some of Sallinger's claims (e.g., that all mortality sources, including cats, add to declining bird populations), I have to give him (and Feral Cat Coalition of Oregon executive director Karen Krauss) credit for taking some rather extraordinary steps in, to use Lynn's words, merging horizons of understanding.