Many types of birds in the US are considered to reach the population of ‘subversion point’

US bird populations are facing alarming reductions due to factors such as habitat loss and climate change, according to a new report that identifies 112 species that have reached a “overturn” point, including 42 with a dangerously low number and steep downward trends.

Even the populations of the duck, which have been considered a history of conservation success, have tended down in recent years, though they are still higher than the 1970 levels, according to the report, released Thursday by a team of science and conservation organizations.

The exhibition examined 718 species using population data, such as Ornithology’s Ebird Status and Trends, the research on the reproduction of birds of America and national society Audubon Society Avian.

“About one in three species of birds (229 species) in the US requires urgent maintenance attention and these species represent the most important habitats and systems in the US and include species that have long been ordinary and abundant,” said Amanda Rodewald, director of the Cornell Schools of the Center.

The exhibition has identified species that have reached a “subversion point”, having lost more than 50% of their numbers in the last half century. Among them, he said 33 species of “yellow warning” with long -term population losses, but relatively stable recent trends, 37 species of “orange” warning with long -term losses that have been accelerated over the last decade and 42 species of “red special” and low -key.

Some of these red species of alarm included the duck, Allen’s Hummingbird, the yellow slap, the red sides of the cormorant, the Greater Sage-Grouse, the Florida Scrub Jay, the Baird’s Sparrow and the Golden-Chekeed, the Golden-Crossbill Warbler.

Some of these birds already have protections under the law on endangered US species.

“The loss and degradation of habitats remain the most important contributors to the reductions of birds and other species,” Rodewald said.

Other factors referring to population reductions included climate change, invasive species, pollution and bird collisions, for example with blades and wind turbine buildings.

The report found that bird populations are reduced to almost every habitat, including grasslands and dry areas. Shorebirds are the team with the most “overthrow point” at 19.

“It represents a huge loss of biodiversity,” said Michael Parr, president of the American Conservancy Bird.

“The only bright spot is water birds, such as herds and egrets that show some increases,” Parr added.

Some examples of common birds now in decline include the Swift chimney, the wooden chewing gum, the sparrow, the Eastern Meadowlark, the Common Grackle, the Barn Swallow, the Blackpoll Warbler, the Herring Gull and the Bobolink.

“We have brought the bird populations behind the rim before and we can do it again,” said Marshall Johnson, the head of Audubon’s national company, showing the bald eagle as an example of a conservation success.

“Not only birds play an important role in our ecosystems. They are also extremely important parts of our lives,” he said. “Bird protection is good for the environment. Local economies and it’s good for people.”