Abstract
We studied subspecies, age and environmental effects on constitutive immune function (natural antibody and complement titres, haptoglobin activity and leukocyte concentrations) in Red Knots (Calidris canutus). We compared C. c. islandica and C. c. canutus in the Wadden Sea and found no difference in immune function between subspecies. However, C. c. canutus on their wintering grounds in Banc d’Arguin had higher natural antibody and lower complement levels than C. c. canutus or C. c. islandica in the Wadden Sea. This suggests that immune function is determined more by the surrounding environment than by subspecies. We also compared age classes in the Wadden Sea and found that first year birds had significantly lower natural antibody levels than adults, but that second year birds no longer differed from adults. Finally, we examined the interaction of age and environment in Banc d’Arguin. We found that first year birds (but not adults) in a low quality habitat had higher leukocyte concentrations than first year birds or adults in a high quality habitat. Differences in available resources and defence needs between environments, and differences among individuals differentially distributed between sites, are likely important contributors to the variation in immune function we report. Future studies, which examine these factors on wild birds, will be important for our understanding of how animals function in their natural environment. (220).
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Acknowledgments
We thank Alberto Castillo for help in the field and laboratory; Nina Bhola, Daliborka Barjaktarov, François Vézina, Magali Petit, Anne Dekinga, Bernard Spaans and the crew of the H. M. Navicula for support in the Wadden Sea; Bernard Spaans, Jutta Leyrer, Jeroen Reneerkens, Edward Koomson, H. ould M. El Hacen and M. Camara for support in Mauritania; Bernard Spaans and Jutta Leyrer for help identifying C. c. islandica and C. c. canutus from resight/recapture data; Anneke Bol for help with molecular sexing and Dick Visser for finalising the figures. Funding was provided by the Natural Sciences and Engineering Research Council of Canada (NSERC) PGSB-267701-2003, a University of Groningen Ubbo Emmius Scholarship, a Netherlands Organization for Scientific Research (NWO) travel grant, and Schure-Beijerinck-Popping Fonds to D.M.B., N.W.O. and the University of Groningen to B.I.T. and T.P., operational grants from the Royal Netherlands Institute for Sea Research (NIOZ) to T.P. and a MAVA grant to T.P. and J. Leyrer.
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Communicated by C. G. Guglielmo.
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Buehler, D.M., Irene Tieleman, B. & Piersma, T. Age and environment affect constitutive immune function in Red Knots (Calidris canutus). J Ornithol 150, 815–825 (2009). https://doi.org/10.1007/s10336-009-0402-6
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DOI: https://doi.org/10.1007/s10336-009-0402-6