Abstract

A phenological study of springtime events was made over a 61-year period at one site in southern Wisconsin. The records over this long period show that several phenological events have been increasing in earliness; we discuss evidence indicating that these changes reflect climate change. The mean of regressions for the 55 phenophases studied was −0.12 day per year, an overall increase in phenological earliness at this site during the period. Some phenophases have not increased in earliness, as would be expected for phenophases that are regulated by photoperiod or by a physiological signal other than local temperature.

Keywords

PhenologyClimate changePeriod (music)photoperiodismBiologyClimatologyEcologyBotany

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Year
1999
Type
article
Volume
96
Issue
17
Pages
9701-9704
Citations
536
Access
Closed

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Nina Leopold Bradley, A. C. Leopold, John Ross et al. (1999). Phenological changes reflect climate change in Wisconsin. Proceedings of the National Academy of Sciences , 96 (17) , 9701-9704. https://doi.org/10.1073/pnas.96.17.9701

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DOI
10.1073/pnas.96.17.9701