The first study launched by the Éolien en Mer SIG in 2021 involved the monitoring of breeding gulls at five natural sites: Bracquemont, Berneval, Belleville, Cap Fagnet and Cap d’Antifer.

In 2022 a major avian influenza epidemic caused the death of hundreds of gulls and prevented ringing to avoid the spread of the virus.

The production of young birds has dropped to a poor level for all colonies.