Abstract
In vertebrates little is known about causes and correlates of differences in individual body condition. This is, however, essential if we are to gain an understanding of environmental influences on wild populations. To track changes in individual physiological state we analysed blood metabolite concentrations in breeding common terns Sterna hirundo. We selected birds to contrast sex, breeding experience, sampling year and nutritional state and collected repeated samples from individuals during incubation. Unlike cholesterol, triglyceride and uric acid levels strongly correlated with nutritional state. While cholesterol levels in males remained stable throughout incubation, comparatively lower levels were measured in females directly after egg-laying. In 2006, only highly experienced females showed increased cholesterol concentrations by mid-incubation, whereas less experienced females maintained reduced levels and were apparently unable to recover. In 2007, all females showed an increase in cholesterol by mid-incubation. Triglyceride levels did not differ between sexes, but concentrations were significantly higher in more experienced birds and were overall higher in 2007 than in 2006. Uric acid concentrations did not differ significantly. The variation in cholesterol and triglyceride levels can be explained by differences in foraging conditions, as food abundance, onset of breeding and mean clutch size indicate 2007 to be the superior year. Thus, environmental conditions and breeding experience play an important role for cholesterol and triglyceride levels as well as the physiological state.
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Acknowledgments
We are grateful for assistance and support to all helpers involved in this study: especially J. J. Riechert, who primarily held responsibility for taking the samples from birds of different nutritional state. A. Braasch, T. H. G. Ezard, A. Ostendorp, G. Wagenknecht and S. Weitekamp for their help in the field, R. Nagel, S. A. Oswald, G. Scheiffarth and J. Trauernicht for technical support and G. A. Schaub for providing the blood-sucking bugs. K. L. Szostek, F. Bairlein and anonymous reviewers helped to improve the paper. This study was done under licence of Niedersächsisches Landesamt für Verbraucherschutz und Lebensmittelsicherheit, Oldenburg (33.42502/18-03.05) and financially supported by Deutsche Forschungsgemeinschaft (BE 916/8 and 9).
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Bauch, C., Kreutzer, S. & Becker, P.H. Breeding experience affects condition: blood metabolite levels over the course of incubation in a seabird. J Comp Physiol B 180, 835–845 (2010). https://doi.org/10.1007/s00360-010-0453-2
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DOI: https://doi.org/10.1007/s00360-010-0453-2