Sentences with phrase «on bird populations of»

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.»

In addition, they are carrying out similar studies to measure the effects on bird populations of «conventional» pollutants such as pesticides and other heavy metals, as well as new molecules such as perfluorinated compounds that are also accumulating in the Antarctic.

Not exact matches

Organic farmers also rely on diverse populations of soil organisms, beneficial insects, and birds to keep pests under control.

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.

A three - year study in Denmark concentrated on the non-crop habitats, such as hedgerows, of conventional and organic farms and their effects on bird populations.

Focus on Feeders helps us understand the changes in populations during this stressful time of year for birds.»

Mass Audubon is on the forefront of understanding the ever - changing patterns of bird and other wildlife populations, and what these changes may mean for the nature of Massachusetts.

Researchers from Radboud University in the Netherlands found that in the two decades since Dutch farmers began using the pesticide on a variety of crops, the birds» population declined by an average of 3.5 percent annually in farmlands where local water levels contained high concentrations of the chemical.

Populations of both penguin species have plummeted in recent years, which the research blames on the loss of the tiny, shrimp - like krill that are a staple food for both birds.

Worldwide, such facilities have been responsible for the deaths of 140,000 to 328,000 birds and 500,000 to 1.6 million bats, raising questions about their effects on population sustainability.

«It's highly likely that in the future, drones will be used to monitor populations of birds and animals, especially in inaccessible areas where on the ground surveying is difficult or impossible.

Eben Paxton of the U.S. Geological Survey Pacific Islands Ecosystems Research Center at Hawaii Volcanoes National Park and colleagues looked at population trends for seven species of native forest birds living on Kauai's Alakai Plateau, the eroded crater of a long - extinct volcano.

Birds can live on any of them, but their populations vary from island to island.

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.

To investigate the impacts of climate fluctuations on Northwestern migratory bird populations, ecologist M. Philip Nott and colleagues at the Institute for Bird Populations in Point Reyes Station, California, captured birds in «mist» nets at 36 stations in forests of Oregon and Washington between 1992 and 2bird populations, ecologist M. Philip Nott and colleagues at the Institute for Bird Populations in Point Reyes Station, California, captured birds in «mist» nets at 36 stations in forests of Oregon and Washington between 199populations, ecologist M. Philip Nott and colleagues at the Institute for Bird Populations in Point Reyes Station, California, captured birds in «mist» nets at 36 stations in forests of Oregon and Washington between 1992 and 2Bird Populations in Point Reyes Station, California, captured birds in «mist» nets at 36 stations in forests of Oregon and Washington between 199Populations in Point Reyes Station, California, captured birds in «mist» nets at 36 stations in forests of Oregon and Washington between 1992 and 2000.

In a paper published in today's issue of Science, they present evidence that when the Isthmus of Tehuantepec in Mexico dried out, it split up dozens of bird populations that now live on either side of the dry area.

In the case of the passenger pigeon, Hung and his colleagues concluded that the population of breeding birds was roughly 330,000 on average, falling to as few as 50,000 birds at points in the last million years.

The agency concluded that the farm will have minimal impact on the population of migratory birds, the activity of local sea life and the ocean views of the politically powerful.

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.»

The study is based on the long - term monitoring of bird populations using the same line transect method.

«We don't know how many tree sparrows there are in China but the size of the consignment underlines the volumes of birds being sold — and it must have some effect on wild populations.»

«Rachel was right about the drastic effect DDT was having on populations of birds, fish, and other wildlife,» Robbins says.

The population - level impact of these viruses on free - living wild bird species is currently unknown.

«This is a prime example of how intensive management of forest lands for industrial purposes can have a direct impact on bird populations in a positive way.»

The study, compiled by the North American Bird Conservation Initiative and the first of its kind to look at the vulnerability of bird populations in Canada, the United States and Mexico, said 37 percent of all 1,154 species on the continent needed urgent conservation actBird Conservation Initiative and the first of its kind to look at the vulnerability of bird populations in Canada, the United States and Mexico, said 37 percent of all 1,154 species on the continent needed urgent conservation actbird populations in Canada, the United States and Mexico, said 37 percent of all 1,154 species on the continent needed urgent conservation action.

But sustaining a population of the birds on a farm is a challenge; because of borers» small size and seasonal population changes, they make up only about 10 % of warblers» diets.

Shifting to renewable energy sources has been widely touted as one of the best ways to fight climate change, but even renewable energy can have a downside, as in the case of wind turbines» effects on bird populations.

«Playback experiments between geographically isolated taxa provide key data on how populations might perceive each other in terms of «same» or «different» if they were in actual contact,» according to Louisiana State University's J.V. Remsen, an expert on Neotropical birds who was not involved in the research.

The calculations (from 304 birds rescued at an average distance of 4,833 metres from their nearest colonies) demonstrate that at least 1 % of the fledglings produced each year by the population are found on the ground due to light pollution.

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.

The focus of the research team, which includes UD graduate student Clark Nissley, was on the Atlantic brant goose, a bird whose population has been fluctuating and on a moderate decline for many years, to learn if limitations during the summer breeding season have accelerated that trend.

Oppel and his team found that they could use audio recordings to estimate a bird's population size after testing the method on a raucous colony of Cory's shearwaters that breeds on a small island in the Azores called Corvo.

The research, published in the British Trust for Ornithology (BTO) journal Bird Study, looked at the breeding populations of three species of large gull; Herring Gull, Great Black - backed Gull and Lesser Black - backed Gull on the Hebridean island of Canna, and the relationship between these gull populations and the fall in the quantity of fish landed in the nearby harbour of Mallaig.

West Nile virus has wreaked havoc mostly on bird populations, but humans and a variety of other animals can become infected as well when bitten by a mosquito that previously dined on an infected bird.

In 1959, the world population of this bird stood at just 26 individuals on Cousin, an island in the Indian Ocean less than a third of a square kilometre in area.

The bacterial population studied in Jiang's lab included as many as 100 million organisms, far more than the number of birds on the Galapagos Islands.

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.

It's one of the largest intact forest ecosystems left on Earth; it's actually only three or four places that have these large unfragmented habitats left and because of that it holds some of the largest populations of mammals and birds — some of the largest populations of wolves, for example, in, caribou as well as, we estimate one to three billion birds that nest there every year and that's some of the birds that are actually stopping off at Central Park.

«Scientist studies effects of wildfire management on bird populations.»

To better understand the interacting effects of habitat degradation and climate on bird populations, researchers from the U.S. Forest Service Pacific Southwest Research Station (PSW), Klamath Bird Observatory, and Costa Rica Bird Observatories spent 12 years studying the White - collared Manakin, a fruit - eating tropical bird, in mature and young forests along the Caribbean coast of Costa Rbird populations, researchers from the U.S. Forest Service Pacific Southwest Research Station (PSW), Klamath Bird Observatory, and Costa Rica Bird Observatories spent 12 years studying the White - collared Manakin, a fruit - eating tropical bird, in mature and young forests along the Caribbean coast of Costa RBird Observatory, and Costa Rica Bird Observatories spent 12 years studying the White - collared Manakin, a fruit - eating tropical bird, in mature and young forests along the Caribbean coast of Costa RBird Observatories spent 12 years studying the White - collared Manakin, a fruit - eating tropical bird, in mature and young forests along the Caribbean coast of Costa Rbird, in mature and young forests along the Caribbean coast of Costa Rica.

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.

Birds play an important role in a wide variety of ecosystems as both predator and prey, in controlling insect populations, pollinating and seed dispersal for many plants, and in releasing nutrients on to land and sea in the form of guano.

The impacts of the wetland maintenance programmes carried out in the wetlands of southern Finland on stopover and nesting bird populations were studied in 2004 - 2012.

This has been shown to have a small but significant impact on population size by increasing the number of breeding birds, as well as influencing the sex ratio.

Using bird - bands, photographs, and DNA fingerprinting, the researchers closely tracked the goings - on in a population of buntings living in a shrubby prairie habitat outside Missoula, Montana.

The positive impacts on bird populations are due to increased space and the presence of cattle.

(The Condor: Ornithological Applications, May 6, 2015)-- Shifting to renewable energy sources has been widely touted as one of the best ways to fight climate change, but even renewable energy can have a downside, as in the case of wind turbines» effects on bird populations.

Populations consisting of billions of birds that existed for tens of thousands of years would have had significant impacts on food resources, so understanding these impacts is vital to managing reintroduction efforts.

They provide control on populations of small mammals and birds, such as beaver, geese and wild turkeys, and can help to provide stability in the composition and numbers of general wildlife populations (Voigt and Berg 1999, Gompper 2002).

Loss of bird populations would have large effects on potential spreading of vegetation to new areas.