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Reduced inflammation in expanding populations of a neotropical bird species.
Auteur(s) : Bailly, Juliette Garnier, Stéphane Khimoun, Aurélie Arnoux, Emilie Eraud, Cyril Goret, Jean-Yves Luglia, Thomas Gaucher, Philippe
Auteurs secondaires : Biogéosciences [Dijon] (BGS) ; Centre National de la Recherche Scientifique (CNRS) - Université de Bourgogne (UB) - AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement Avifaune Migratrice (CNERA) ; Office National de la Chasse et de la Faune Sauvage Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Université de Guyane (UG) - Centre National de la Recherche Scientifique (CNRS) Groupe d’Etude et de Protection des Oiseaux de Guyane UPS CNRS Guyane (UCG) ; Centre National de la Recherche Scientifique (CNRS) ERA-Net Net-Biome; Agence Nationale de laRecherche; Conseil Régional de Bourgogne;Conseil Régional de Guyane; ConseilRégional de la Martinique; FRB

Éditeur(s) : HAL CCSD Wiley Open Access
Résumé : 11 pages
International audience
The loss of regulating agents such as parasites is among the most important changes in biotic interactions experienced by populations established in newly colonized areas. Under a relaxed parasite pressure, individuals investing less in costly immune mechanisms might experience a selective advantage and become successful colonizers as they re-allocate resources to other fitness-related traits. Accordingly, a refinement of the evolution of increased competitive ability (EICA) hypothesis proposed that immunity of invasive populations has evolved toward a reduced investment in innate immunity, the most costly component of immunity, and an increased humoral immunity that is less costly. Biogeographical approaches comparing populations between native and expansion ranges are particularly relevant in exploring this issue, but remain very scarce. We conducted a biogeographical comparison between populations of Spectacled Thrush (Turdus nudigenis) from the native area (South America) and from the expansion range (Caribbean islands). First, we compared haemosporidian prevalence and circulating haptoglobin (an acute-phase protein produced during inflammation). Second, we challenged captive birds from both ranges with Escherichia coli lipopolysaccharides (LPS) and measured postchallenge haptoglobin production and body mass change. Birds from the expansion range showed lower haemosporidian prevalence and lower levels of haptoglobin than birds from the native range. In addition, the inflammation elicited by LPS injection and its associated cost in terms of body mass loss were lower in birds from the expansion range than in birds from the native range. In accordance with the enemy release hypothesis, our results suggest that range expansion is associated with a reduced infection risk. Our study also supports the hypothesis that individuals from newly established populations have evolved mechanisms to dampen the inflammatory response and are in accordance with one prediction of the refined EICA hypothesis, proposed to understand biological invasions.
ISSN: 2045-7758

hal-01403291
https://hal.archives-ouvertes.fr/hal-01403291
DOI : 10.1002/ece3.2486

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