Abstract
It is widely accepted that stable isotope ratios in inert tissues such as feather keratin reflect the dietary isotopic signature at the time of the tissue synthesis. However, some elements such as stable nitrogen isotopes can be affected by individual physiological state and nutritional stress. Using malaria infection experiment protocols, we estimated the possible effect of malaria parasite infections on feather carbon (δ13C) and nitrogen (δ15N) isotope signatures in juvenile common crossbills Loxia curvirostra. The birds were experimentally infected with Plasmodium relictum (lineage SGS1) and P. ashfordi (GRW2), two widespread parasites of passerines. Experimental birds developed heavy parasitemia of both parasites and maintained high levels throughout the experiment (33 days). We found no significant difference between experimental and control birds in both δ13C and δ15N values of feathers re-grown. The study shows that even heavy primary infections of malaria parasites do not affect feather δ13C and δ15N isotopic signatures. The results of this experiment demonstrate that feather isotope values of wild-caught birds accurately reflect the dietary isotopic sources at the time of tissue synthesis even when the animal’s immune system might be challenged due to parasitic infection.
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Acknowledgments
The present study was supported by the Swedish Research Council (621–2007–5193), the Lithuanian State Science and Studies Foundation, NSF Grant DBI-011620 and Max-Planck Society. The experiments described herein comply with the current laws of Sweden, Russia and Lithuania. The authors are grateful to the staff of the Biological Station “Rybachy” of the Zoological Institute of the Russian Academy of Sciences for assistance in the field. We thank Scott McWilliams, Petr Prochazka and an anonymous reviewer for valuable comments on the manuscript.
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Yohannes, E., Palinauskas, V., Valkiūnas, G. et al. Does avian malaria infection affect feather stable isotope signatures?. Oecologia 167, 937–942 (2011). https://doi.org/10.1007/s00442-011-2041-x
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DOI: https://doi.org/10.1007/s00442-011-2041-x