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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Linking environmental indicators to blood, feather and claw δ18O in the Saffron Finch (Sicalis flaveola) in the central Brazilian savannas (2022)
Auteurs :	Fábio José Viana Costa, Auteur ; Keith A. Hobson, Auteur ; Michael B. Wunder, Auteur ; Gabriela Bielefeld Nardoto, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (163(1) January, 2022)
Article en page(s) :	223-234
Langues:	Anglais
Résumé :	Understanding linkages between biotic and abiotic processes operating in highly seasonal environments such as the Savannas in the Neotropics is tremendously challenging but has been aided considerably through biogeochemical markers. Stable isotope ratios have been widely used as spatial and temporal integrative markers, signaling environmental information. Our objective in this study was to examine the relationship of tissue δ18O and environmental factors and among multiple tissues in Saffron Finches, since this species is primary resident and abundant in the region. We conducted this study in a private farm in the central Brazilian savannas. We sampled 194 individuals in seven field samplings between January 2017 and March 2018. We collected whole blood, feathers and claws and analyzed them for δ18O in both the yellow (YEL) and dull (DULL) plumage categories. We built different sets of environmental variables as predictors of blood δ18O. Median blood δ18O varied widely throughout the year (13.4–18.8 ‰), differing in most pairwise comparison of months. Primary and tail feathers for both categories showed narrower isotopic median ranges compared to blood. Claw δ18O showed smaller isotopic ratio variation than the other tissues. Our results showed that δ18O values in avian blood are related to local climatic variables and reflect changes through time. The amount of precipitation, humidity and temperature were the most important environmental predictors. Therefore, the use of δ18O in different avian tissues could be used as a proxy to infer different environmental and ecological aspects related to the Saffron Finch.
En ligne :	https://doi.org/10.1007/s10336-021-01939-0

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