One in eight bird species is threatened with global extinction, and once widespread creatures such as the puffin, snowy owl and turtle dove are plummeting towards oblivion, according to the definitive study of global bird populations. The State of the World’s Birds, a five-year compendium of population data from the best-studied group of animals on the planet, reveals a biodiversity crisis driven by the expansion and intensification of agriculture. In all, 74% of 1,469 globally threatened birds are affected primarily by farming. Logging, invasive species and hunting are the other main threats.
“Each time we undertake this assessment we see slightly more species at risk of extinction – the situation is deteriorating and the trends are intensifying,” said Tris Allinson, senior global science officer for BirdLife International, which produced the report. “The species at risk of extinction were once on mountaintops or remote islands, such as the pink pigeon in Mauritius. Now we’re seeing once widespread and familiar species – European turtle doves, Atlantic puffins and kittiwakes – under threat of global extinction.”
According to the report, at least 40% of bird species worldwide are in decline, with researchers blaming human activity for the losses. After farming, logging is a key factor in declines of 50% of the most globally endangered species, followed by invasive species (39%), hunting and trapping (35%), climate change (33%) and residential and commercial development (28%). The illegal killing of birds – usually because of traditional hunting – results in an estimated 12 to 38 million individual birds dying or being taken each year in the Mediterranean region alone.
Neonicotinoids – widely implicated in flying insect declines (a key bird food source) – have also been found to be directly detrimental to some bird species. One recent study from the US found that migrating white-crowned sparrows exposed to neonicotinoids lost a quarter of their body mass and fat stores. The neurotoxin also impaired the birds’ migratory orientation.
Source: The Guardian, 23 April 2018