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A recent study by the RSPB has revealed that two of the largest northern gannet colonies in the world have suffered severe declines due to the 2022 outbreak of H5N1 bird flu. These colonies, located on Bass Rock off the east coast of Scotland and Grassholm near Pembrokeshire in Wales, faced an unprecedented loss in adult birds. The mortality rate increased fourfold, causing a 26% reduction in the Bass Rock population and a 38% decrease at Grassholm. Experts warn that it will take nearly two decades for these colonies to recover fully, with projections suggesting recovery won’t be seen until at least 2041.
The H5N1 strain of bird flu was originally detected in domestic poultry in Asia back in 1996 but has since spread globally, affecting wild bird populations. On Bass Rock, the virus was first confirmed among gannets on June 4, 2022, followed by detection at Grassholm a month later. Given that adult breeding gannets play a crucial role in the growth and sustainability of the colonies, the spike in adult deaths is expected to have long-lasting repercussions. The study’s authors have recommended that the conservation status of the Northern gannet on the IUCN Red List, where it is currently classified as “least concern,” should be reconsidered due to the impact of the outbreak.
Bass Rock, which hosts the world’s largest northern gannet colony, was recently acquired by RSPB Scotland from the Hamilton-Dalrymple family, who had owned the island for 320 years. This island, situated about three miles from North Berwick, is a vital breeding ground for these seabirds during the summer. Despite its ecological importance, recent surveys have shown a worrying decline in seabird populations across the UK, with many breeding groups continuing to deteriorate. These findings emphasize the fragility of seabird ecosystems and the urgent need for conservation efforts.
Jude Lane, who led the RSPB study and is a marine conservation scientist, stated that the 2022 bird flu outbreak caused a “devastating blow” to UK seabirds. She highlighted that the impacts on key gannet colonies will persist for decades. Lane stressed the importance of long-term monitoring to better understand the effects of such diseases and to address other significant threats facing seabirds. According to her, this knowledge is essential to halt the alarming population declines observed in recent years, even though diseases like bird flu cannot be prevented
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