Thursday, December 1, 2011

The number of wild birds in cropland decreased by 52% throughout the past 40 years, with the doves in danger

Datablog British bird population - that is, which fell

farmland birds in Britain

fell to their lowest figures ever recorded, despite efforts in some parts of the country to protect them from adverse changes in their habitats.

The number of birds that feed and nest on land under cultivation has dropped by 52% throughout the past 40 years, with some species such as doves, partridges, gray starlings, sparrows and wheat by 80% during the same period.

The turtle is now endangered in the United Kingdom of farmland birds in danger of being completely removed from the British landscape, environmentalists said.

Other agricultural species, including the wagtail, lapwings and finches, are declining concern. Although most species undergo changes in land use and agricultural practices, the greenfinch is a victim of the disease trichomoniasis.

"The decline of the turtle is of particular concern," said Martin Harper, Director of Conservation of the Royal Society for the Protection of Birds (RSPB). "It's a beautiful bird, which has a symbolic connection with the English countryside are only now beginning to discover what is causing their populations drop dramatically."


more fully and effectively has affected birds feed on weed seeds and agricultural land, especially in the winter months, and some farmers have tried to limit the damage lines of flowers wild and planted areas skylark, leaving the stubble without plowing during the winter, and overgrazing of the land.

The number of forest birds have declined by one fifth since 1970, but there were no winners and losers in the group. Seven species, including nightingales, warblers and willow tits, fell 70%, while the populations of green woodpeckers, warblers and hawks have more than doubled.

The driver for the overall reduction of forest birds is uncertain, but environmentalists say a decline in managed forests, overgrazing by deer and forests of aging as the main factors.

global warming seems to be taking a toll on some species. Although birds are 30% by number in 1970, some fared much worse than others. Of particular concern are the gulls, which fell 34% in Britain, and suffer a similar fate in continental Europe. The declines have been linked to warmer temperatures in the sea surface were transferred from tape on plankton in the North Sea, resulting in a decline in sand eels feed the birds.
Arctic skuas was well between 1970 and 1985, but its numbers have been halved. Guillemots was better, rising 168% during the period.

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