The devastating impact of the 2022 bird flu outbreak on gannet populations off Scotland and Wales' coasts has been laid bare in a stark new study by the RSPB, revealing that these colonies will take almost two decades to recover from the 'unprecedented deadly blow'. Major seabird hotspots Bass Rock, off Scotland's east coast, and Grassholm, situated off Pembrokeshire in Wales, were among those severely affected, with a fourfold increase in adult gannet deaths resulting in a 26% reduction at Bass Rock and a 38% decline at Grassholm.
The H5N1 avian influenza virus, which was first identified in Asia in 1996 before spreading globally, claimed the lives of tens of thousands of birds. At these crucial breeding grounds, adult gannets are essential drivers of population growth – their increased mortality will have lasting consequences for years to come.
Researchers at the RSPB warn that since the outbreak's immediate impact was already significant, the long-term implications for Bass Rock and Grassholm colonies should not be underestimated. The study projects that these vital populations may take until 2041 to recover from the devastation caused by the H5N1 virus.
The RSPB has recommended re-evaluating the global conservation status of Northern gannets in light of this new information. Currently, they are listed as 'least concern' on the IUCN Red List of threatened species – a classification that may no longer accurately reflect their vulnerability following the widespread impact of the H5N1 virus.
Jude Lane, lead author and marine conservation scientist at the RSPB, highlighted the enduring consequences: 'The 2022 bird flu outbreak dealt an unprecedented deadly blow to UK seabirds, with key gannet colonies on Bass Rock and Grassholm facing decades-long recovery. While disease prevention is challenging, long-term monitoring can help us better understand these impacts and address other pressures threatening seabird populations.'