Climate change affects the duration of the reproductive season in birds
Article first published online: 1 MAR 2010
© 2010 The Authors. Journal compilation © 2010 British Ecological Society
Journal of Animal Ecology
Volume 79, Issue 4, pages 777–784, July 2010
How to Cite
Møller, A. P., Flensted-Jensen, E., Klarborg, K., Mardal, W. and Nielsen, J. T. (2010), Climate change affects the duration of the reproductive season in birds. Journal of Animal Ecology, 79: 777–784. doi: 10.1111/j.1365-2656.2010.01677.x
- Issue published online: 7 JUN 2010
- Article first published online: 1 MAR 2010
- Received 16 September 2009; accepted 5 February 2010 Handling Editor: Simon Verhulst
- breeding season;
- comparative analyses;
- multi-brooded species;
- variance in timing of breeding
1. The duration of the reproductive season may depend on the duration of the growing season, with recent amelioration in spring temperatures allowing earlier start of reproduction. Earlier start of reproduction may allow a longer breeding season because of more broods a longer interval between broods for multi-brooded species.
2. We analysed extensive long-term data sets on timing of breeding in 20 species of birds from Denmark, based on records of over 100 000 individual offspring, showing considerable heterogeneity among species in temporal change in duration of the breeding season.
3. Multi-brooded species increased the duration of their breeding season by 0·43 days year−1 while single-brooded species decreased the duration of their breeding season by 0·44 days year−1. This implies that recent climate change has allowed more broods or better temporal spacing of broods in multi-brooded species, while the time window for reproduction has become narrower in single-brooded species.
4. The single-most important predictor of change in duration of the breeding season was change in the date breeding started; there was no change in the date of end of breeding. Species advancing their breeding date the most also expanded the duration of the breeding season. In contrast, long-distance migration and generation time did not predict change in duration of the breeding season.