Phenological changes reflect climate change in Wisconsin

A phenological study of springtime events as 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...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 1999-08, Vol.96 (17), p.9701-9704
Hauptverfasser: Bradley, N.L, Leopold, A.C, Ross, J, Huffaker, W
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Sprache:eng
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Zusammenfassung:A phenological study of springtime events as 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.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.96.17.9701