Daily energy expenditure in white storks is lower after fledging than in the nest

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2020
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Schaeffer, Paul J.
Taylor, Jan R. E.
Müller, Inge
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Zusammenfassung

Many juvenile birds turn into long-distance migrants within weeks of fledging. This transition involves upheavals in their energy management as major changes in growth and activity occur. Understanding such ontogenetic transitions in energy allocation has been difficult because collecting continuous data on energy costs in wild developing birds was largely impossible. Here we continuously measured heart rates and fine-scale movements of twenty free-living juvenile white storks (Ciconia ciconia) using on-board bio-loggers to explore individual and environmental factors relating to daily mean heart rates. In addition, we explored which specific energy management strategy storks use during these crucial early life stages. We found that daily mean heart rate increased with overall movement activity, and increasing body temperature, but that it decreased with age. Further, we found that during the nestling period, when growth costs are high activity costs are low, and post-fledging that activity costs are increased while maintenance costs were low, indicating a constraint on overall energy use in both phases. Our observations are consistent with the hypothesis that individuals invested more energy per unit time while still in the nest than after fledging despite the high costs of flight.

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570 Biowissenschaften, Biologie
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energy management model, energy expenditure, heart rate, white storks, ontogeny
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ISO 690FLACK, Andrea, Paul J. SCHAEFFER, Jan R. E. TAYLOR, Inge MÜLLER, Martin WIKELSKI, Wolfgang FIEDLER, 2020. Daily energy expenditure in white storks is lower after fledging than in the nest. In: The Journal of experimental biology. The Company of Biologists. 2020, 223(Pt 2), jeb219337. ISSN 0022-0949. eISSN 1477-9145. Available under: doi: 10.1242/jeb.219337
BibTex
@article{Flack2020-01-28Daily-48179,
  year={2020},
  doi={10.1242/jeb.219337},
  title={Daily energy expenditure in white storks is lower after fledging than in the nest},
  number={Pt 2},
  volume={223},
  issn={0022-0949},
  journal={The Journal of experimental biology},
  author={Flack, Andrea and Schaeffer, Paul J. and Taylor, Jan R. E. and Müller, Inge and Wikelski, Martin and Fiedler, Wolfgang},
  note={Article Number: jeb219337}
}
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