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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Young, wild, and free—Subadult White-naped Crane (Antigone vipio) exhibit wider home range movements than breeding adults during the summering period (2023)
Auteurs :	Ming Gao, Auteur ; Baasansuren Erdenechimeg, Auteur ; Gankhuyag Purev-Ochir, Auteur ; Amarkhuu Gungaa, Auteur ; Yumin Guo, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (164(3) July, 2023)
Article en page(s) :	561-572
Langues:	Anglais
Mots-clés:	GPS/GSM tracking ; Home range ; Kernel density estimate ; Space use ; Subadult ; White-naped Crane (Antigone vipio)
Résumé :	Understanding space use and how it changes over time is critical in animal ecology. The subadult period is the transition from juvenile to adult. Adults and subadults have different biological requirements in summer, resulting in differential space use patterns. We tagged 66 White-naped Cranes (Antigone vipio) in eastern Mongolia, including 22 adults and 44 hatch-year juveniles, using GPS/GSM trackers from July to August, 2017–2019. The objectives are to characterize and compare space use, especially home ranges of adults and subadults, of White-naped Cranes and to investigate patterns in summer. We split the entire summering period into 6 stages (pre-incubation, incubation/nestling, pre-molting, molting/post-molting, post-fledging, moving to another area before autumn migration) and estimated home ranges, core areas using kernel density estimates (KDE) and minimum convex polygons (MCPs). We found that subadults exhibit wider home range movements than adults and that subadults’ ranging areas (corresponding to the home range of adults) decreased from the first half to the second half of the summer. Breeding adults had the smallest home ranges, while one-year-old and two-year-old subadults had equally the largest ranging areas but which decreased significantly when subadults reached sexual maturity at three years old. Throughout the summer, the changing pattern of breeders was generally opposite to that of subadults. All subadult age groups had the largest ranging areas when breeders’ home ranges were the smallest during the incubation/nestling stage. This study highlights the difference between adults and subadults and contributes to subadult ecology.
En ligne :	https://doi.org/10.1007/s10336-023-02053-z

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