The survey, done by the Pan-European Common Bird Monitoring Scheme, also found that Britain has been one of the nations worst affected by losses to its farmland bird populations. In Europe the population of grey partridges has dropped from 13.4 million to 2.4 million, a loss of 82 per cent.
These losses were described as shocking by the scheme's chairman, Richard Gregory.
"We had got used to noting a loss of a few per cent in numbers of various species over one or two years. It was only when we added up numbers of all the different farmland bird species for each year since 1980, when we started keeping records, that we found their overall population has dropped from 600 million to 300 million, which is a calamitous loss. We have been sleepwalking into a disaster."
According to Gregory, who also serves as the head of species monitoring for the UK's Royal Society for the Preservation of Birds, a range of factors are involved. In the case of the grey partridge, he blamed the intensification of farming which had killed off the plentiful insects they ate.
With starlings, whose populations have fallen from 84.9 million to 39.9 million, a drop of 53 per cent, it has been the destruction of woodlands and the corresponding loss of nesting places that has done the most serious damage, he said.
"By contrast, lapwings - whose numbers have declined from 3.8 million to 1.8 million, a drop of 52 per cent - are more associated with marshes and riverbanks. It has been the draining of these lands that has destroyed their habitats and reduced their numbers so drastically."
However, the society was emphatic that individual farmers should not take the blame for the devastating drop in farmland bird numbers that has occurred over the past 30 years.
"The decline of farmland birds across Europe has been one of our greatest wildlife tragedies but it is important to remember they have been driven by farming policy rather than farmers themselves," said Jenna Hegarty, the society's senior agricultural policy officer.
The fact that the high losses of linnets, turtle doves and other farmland birds had not been expected was blamed by Gregory on a phenomenon known as the shifting baseline syndrome.
"We take for granted things that two generations ago would have seemed inconceivable - in this case the reduction by 300 million of Europe's farmland bird population," he said. "Apart from the removal of creatures that are beautiful to behold and beautiful to listen to, we should take note of what this means. These losses are telling us that something is seriously amiss in the world around us and the way that we are interacting with nature."
However, it is unlikely that the problem will get better in the near future, he added. In Bulgaria, Poland and the EU's other, newer member nations in eastern Europe, the farming policies that have been responsible for wiping out vast numbers of farmland birds in older member countries are only being introduced today. Once they take effect, overall numbers of farmland birds will drop even further, it is expected. Observer
