Abstract
In recent years, highly pathogenic H5N1 avian influenza has occasionally plagued wild bird populations. For the first time in 2022, it was particularly virulent on the gull populations of the Hauts-de-France coast (France). This work analyzes the consequences of the virus on the numbers and production of young in three colonies of gulls (Laughing Gull, Mediterranean Gull, and Sandwich Tern) on the coast of Pas-de-Calais and the Somme by comparing with the results of the years previous pandemic-free periods. This work also compares the numbers of roosts of several species of gulls in the Authie-Somme reserve obtained in spring to autumn in 2022 with those of previous years.
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