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Highly pathogenic avian influenza causes mass mortality in Sandwich Tern Thalasseus sandvicensis breeding colonies across north-western Europe

Lookup NU author(s): Ibrahim Alfarwi, Dr Chris RedfernORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© The Author(s), 2024. Published by Cambridge University Press on behalf of BirdLife International. In 2022, highly pathogenic avian influenza (HPAI) A(H5N1) virus clade 2.3.4.4b became enzootic and caused mass mortality in Sandwich Tern Thalasseus sandvicensis and other seabird species across north-western Europe. We present data on the characteristics of the spread of the virus between and within breeding colonies and the number of dead adult Sandwich Terns recorded at breeding sites throughout north-western Europe. Within two months of the first reported mortalities, 20,531 adult Sandwich Terns were found dead, which is >17% of the total north-western European breeding population. This is probably an under-representation of total mortality, as many carcasses are likely to have gone unnoticed and unreported. Within affected colonies, almost all chicks died. After the peak of the outbreak, in a colony established by late breeders, 25.7% of tested adults showed immunity to HPAI subtype H5. Removal of carcasses was associated with lower levels of mortality at affected colonies. More research on the sources and modes of transmission, incubation times, effective containment, and immunity is urgently needed to combat this major threat for colonial seabirds.


Publication metadata

Author(s): Knief U, Bregnballe T, Alfarwi I, Ballmann MZ, Brenninkmeijer A, Bzoma S, Chabrolle A, Dimmlich J, Engel E, Fijn R, Fischer K, Halterlein B, Haupt M, Hennig V, Herrmann C, In 'T Veld R, Kirchhoff E, Kristersson M, Kuhn S, Larsson K, Larsson R, Lawton N, Leopold M, Lilipaly S, Lock L, Marty R, Matheve H, Meissner Wl, Morrison P, Newton S, Olofsson P, Packmor F, Pedersen KT, Redfern C, Scarton F, Schenk F, Scher O, Serra L, Sibille A, Smith J, Smith W, Sterup J, Stienen E, Strassner V, Valle RG, Van Bemmelen RSA, Veen J, Vervaeke M, Weston E, Wojcieszek M, Courtens W

Publication type: Article

Publication status: Published

Journal: Bird Conservation International

Year: 2024

Volume: 34

Online publication date: 02/02/2024

Acceptance date: 27/11/2023

Date deposited: 02/02/2024

ISSN (print): 0959-2709

ISSN (electronic): 1474-0001

Publisher: Cambridge University Press

URL: https://doi.org/10.1017/S0959270923000400

DOI: 10.1017/S0959270923000400


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Funding

Funder referenceFunder name
Common Wadden Sea Secretariat
EU Life
Flemish Agency for Nature and Forests, Belgium
Ministry of Infrastructure and Water Management of the Netherlands
LIFE19NAT/UK/964
Ministry of Agriculture, Nature and Food Quality of the Netherlands
OFB, DREAL Occitanie, DREAL PACA

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