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Exploring the infection dynamics of a bacterial pathogen on a remote oceanic island reveals annual epizootics impacting an albatross population

Audrey Jaeger, View ORCID ProfileAmandine Gamble, Erwan Lagadec, View ORCID ProfileCamille Lebarbenchon, Vincent Bourret, Jérémy Tornos, Christophe Barbraud, Karin Lemberger, View ORCID ProfileKarine Delord, View ORCID ProfileHenri Weimerskirch, Jean-Baptiste Thiebot, View ORCID ProfileThierry Boulinier, Pablo Tortosa
doi: https://doi.org/10.1101/711283
Audrey Jaeger
1Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), INSERM 1187, CNRS 9192, IRD 249. Plateforme Technologique CYROI, Sainte-Clotilde, La Réunion, France
2Université de La Réunion, UMR ENTROPIE (Écologie marine tropicale des océans Pacifique et Indien) IRD 250, CNRS. 15 Avenue René Cassin, CS 92003, 97744 Saint Denis Cedex 9, La Réunion, France
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Amandine Gamble
3Centre d’Écologie Fonctionnelle et Évolutive (CEFE), CNRS, University of Montpellier, EPHE, University Paul Valéry Montpellier 3, IRD, Montpellier, France
4Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, USA
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  • ORCID record for Amandine Gamble
Erwan Lagadec
1Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), INSERM 1187, CNRS 9192, IRD 249. Plateforme Technologique CYROI, Sainte-Clotilde, La Réunion, France
5Réserve Naturelle Nationale des Terres Australes Françaises, Terres Australes et Antarctiques Françaises, rue Gabriel Dejean, Saint Pierre, La Réunion, France
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Camille Lebarbenchon
1Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), INSERM 1187, CNRS 9192, IRD 249. Plateforme Technologique CYROI, Sainte-Clotilde, La Réunion, France
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  • ORCID record for Camille Lebarbenchon
Vincent Bourret
3Centre d’Écologie Fonctionnelle et Évolutive (CEFE), CNRS, University of Montpellier, EPHE, University Paul Valéry Montpellier 3, IRD, Montpellier, France
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Jérémy Tornos
3Centre d’Écologie Fonctionnelle et Évolutive (CEFE), CNRS, University of Montpellier, EPHE, University Paul Valéry Montpellier 3, IRD, Montpellier, France
6Ceva Biovac Campus, Beaucouzé, France
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Christophe Barbraud
7Centre d’Études Biologiques de Chizé, UMR CNRS 7372, Université La Rochelle, Villiers en Bois, France
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Karin Lemberger
8Vet Diagnostics. 14, avenue Rockefeller, 69008 Lyon, France
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Karine Delord
7Centre d’Études Biologiques de Chizé, UMR CNRS 7372, Université La Rochelle, Villiers en Bois, France
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  • ORCID record for Karine Delord
Henri Weimerskirch
7Centre d’Études Biologiques de Chizé, UMR CNRS 7372, Université La Rochelle, Villiers en Bois, France
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Jean-Baptiste Thiebot
4Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, USA
7Centre d’Études Biologiques de Chizé, UMR CNRS 7372, Université La Rochelle, Villiers en Bois, France
9National Institute of Polar Research. 10-3, Midori-cho, Tachikawa. Tokyo 190-8518, Japan
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Thierry Boulinier
3Centre d’Écologie Fonctionnelle et Évolutive (CEFE), CNRS, University of Montpellier, EPHE, University Paul Valéry Montpellier 3, IRD, Montpellier, France
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Pablo Tortosa
1Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), INSERM 1187, CNRS 9192, IRD 249. Plateforme Technologique CYROI, Sainte-Clotilde, La Réunion, France
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  • For correspondence: pablo.tortosa@univ-reunion.fr
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Abstract

Oceanic islands with reduced species richness provide an opportunity to investigate the emergence, maintenance and transmission of infectious diseases threatening wildlife. On Amsterdam Island, in the southern Indian Ocean, massive and recurrent mortality of the nestlings of Indian yellow-nosed albatross (Thalassarche carteri) has been attributed to avian cholera caused by Pasteurella multocida, a bacterial pathogen of likely human introduction. To understand the annual dynamics of pathogen prevalence, we measured the shedding of bacterial DNA by the albatrosses during four successive breeding seasons. The screening of 583 bird swabs by Real-Time PCR revealed an intense circulation of P. multocida during each study year, with a steady increase of infection prevalence across the breeding season. In the three years of highest pathogen prevalence, the epizootics were associated with massive die-offs of nestlings, inducing low annual fledging success (< 20%). These findings and developed PCR protocol have crucial applications for refining wildlife conservation plans aiming at controlling this disease.

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Posted July 23, 2019.
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Exploring the infection dynamics of a bacterial pathogen on a remote oceanic island reveals annual epizootics impacting an albatross population
Audrey Jaeger, Amandine Gamble, Erwan Lagadec, Camille Lebarbenchon, Vincent Bourret, Jérémy Tornos, Christophe Barbraud, Karin Lemberger, Karine Delord, Henri Weimerskirch, Jean-Baptiste Thiebot, Thierry Boulinier, Pablo Tortosa
bioRxiv 711283; doi: https://doi.org/10.1101/711283
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Exploring the infection dynamics of a bacterial pathogen on a remote oceanic island reveals annual epizootics impacting an albatross population
Audrey Jaeger, Amandine Gamble, Erwan Lagadec, Camille Lebarbenchon, Vincent Bourret, Jérémy Tornos, Christophe Barbraud, Karin Lemberger, Karine Delord, Henri Weimerskirch, Jean-Baptiste Thiebot, Thierry Boulinier, Pablo Tortosa
bioRxiv 711283; doi: https://doi.org/10.1101/711283

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