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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Low survival of eggs and nestlings explain the decline of a local Jankowski’s Bunting population (2022)
Auteurs :	Zheng Han, Auteur ; Alexandre Robert, Auteur ; Haitao Wang, Auteur ; Frédéric Jiguet, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (163(3) July, 2022)
Article en page(s) :	817-826
Langues:	Anglais
Mots-clés:	Demographic drivers ; Grassland birds ; Jankowski’s bunting ; Population
Résumé :	Jankowski’s Bunting Emberiza jankowskii is one of several grassland birds that have suffered major population declines across their ranges, and the cause of these declines remains largely unknown. To determine what demographic drivers are responsible for their decline, we combined specific annual female productivity from a local Jankowski’s Bunting population and survival probabilities from the Ortolan Bunting, an ecologically similar species. We used an age-structured matrix population model to examine the population dynamics of Jankowski’s Bunting and showed that they may not be capable of sustaining a stable population, even without environmental stochasticity and density dependence. Compared to other Emberiza buntings with similar population trends, our results indicate that the population decline in Jankowski’s Bunting is largely caused by a particularly low reproductive success, and in particular a very low survival of eggs and nestlings. Despite the relatively low elasticity of the population dynamics to breeding parameters, our analysis suggests that increasing the number of fledglings to levels similar to those of closely related species would result in a growing population. Given that the reproductive success is highly influenced by nest predation or human disturbance, we suggest that initial conservation actions reducing interference from human activities are meaningful to improve the reproductive success of remaining Jankowski’s Bunting populations and allow the species to persist in the long term.
En ligne :	https://doi.org/10.1007/s10336-022-01983-4

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