Abstract
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.
Zusammenfassung
Umweltindikatoren und δ18O in Blut, Federn und Krallen der Safrangilbtangare ( Sicalis flaveola ) in den zentralbrasilianischen Savannen
Das Verständnis der Zusammenhänge zwischen biotischen und abiotischen Prozessen, die in stark saisonabhängigen Umgebungen wie den Savannen in der Neotropis ablaufen, ist eine enorme Herausforderung, die jedoch durch biogeochemische Marker erheblich erleichtert wurde. Stabile Isotopenverhältnisse werden häufig als räumliche und zeitliche integrative Marker verwendet, die Informationen über die Umwelt signalisieren. Unser Ziel in dieser Studie war es, die Beziehung zwischen Gewebe δ18O und Umweltfaktoren sowie zwischen verschiedenen Geweben bei Safrangilbtangaren zu untersuchen, da diese Art in der Region primär ansässig und häufig ist. Wir führten diese Studie auf einer privaten Farm in den zentralbrasilianischen Savannen durch. Zwischen Januar 2017 und März 2018 haben wir 194 Individuen in sieben Felduntersuchungen beprobt. Wir sammelten Vollblut, Federn und Krallen und analysierten sie auf δ18O sowohl in den gelben (YEL) als auch in den matten (DULL) Gefiederkategorien. Wir erstellten verschiedene Sätze von Umweltvariablen als Prädiktoren für δ18O im Blut. Der mittlere Blut-δ18O-Wert schwankte im Jahresverlauf stark (13,4 bis 18,8 ‰) und unterschied sich in den meisten paarweisen Vergleichen der Monate. Primär- und Schwanzfedern wiesen für beide Kategorien im Vergleich zum Blut engere isotopische Medianbereiche auf. Das δ18O der Krallen wies geringere Schwankungen im Isotopenverhältnis auf als die anderen Gewebe. Unsere Ergebnisse zeigen, dass die δ18O-Werte im Blut von Vögeln mit lokalen Klimavariablen zusammenhängen und Veränderungen im Laufe der Zeit widerspiegeln. Die Niederschlagsmenge, die Luftfeuchtigkeit und die Temperatur waren die wichtigsten Umweltprädiktoren. Daher könnte die Verwendung von δ18O in verschiedenen Vogelgeweben als Proxy verwendet werden, um verschiedene Umwelt- und ökologische Aspekte in Bezug auf die Safrangilbtangare abzuleiten.
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Acknowledgements
We are thankful to the Tabapuã do Pireneus farm and workers who helped with the field work. We thank the Environmental Isotope Studies–University of Brasília group for all the scientific discussion and help in the field. We also thank to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES)—Finance Code 001 and Edital Capes Pro-Forense/2014 (grant number 23038.006832/2014-11) which financed this study.
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FJVC and GBN contributed to the study conception and design. Material preparation and data collection were performed by FJVC. KAH and MBW contributed to the data interpretation, statistical analysis and manuscript outline and writing. The first draft of the manuscript was written by FJVC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Communicated by C. G. Guglielmo.
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Costa, F.J.V., Hobson, K.A., Wunder, M.B. et al. Linking environmental indicators to blood, feather and claw δ18O in the Saffron Finch (Sicalis flaveola) in the central Brazilian savannas. J Ornithol 163, 223–234 (2022). https://doi.org/10.1007/s10336-021-01939-0
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DOI: https://doi.org/10.1007/s10336-021-01939-0