Abstract
Anthropogenic warming’s effects on phenology across environmental and temporal gradients are well recognized. Long-term phenological monitoring data are often limited in duration and geographic scope, but recent efforts to digitize herbaria collections make it possible to reliably reconstruct historic flowering phenology across broad geographic scales and multiple species, lending to an increased understanding of community response to climate change. In this study, we examined collection dates (1901 to 2015) of 8540 flowering specimens from 39 native species in the Pacific Northwest (PNW) region of North America. We hypothesized that flowering phenology would be sensitive to temperature but that sensitivity would vary depending on blooming season and geographic range position. As expected, we found that early-season bloomers are more sensitive to temperature than later-season bloomers. Sensitivity to temperature was significantly greater at low elevations and in the maritime (western) portion of the PNW than at higher elevations and in the eastern interior, respectively. The elevational and longitudinal effects on flowering sensitivity reflect spring “arriving” earlier at low elevations and in the maritime portion of the PNW. These results demonstrate that phenological responses to warming vary substantially across climatically diverse regions, warranting careful and nuanced consideration of climate warming’s effects on plant phenology.
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Acknowledgments
We thank the botanists that collected the specimens examined in this study. Jonathan Davies and Elizabeth Wolkovich provided feedback and advice on an early draft of this manuscript. Louisa Hsu assisted with data collection. We also thank the anonymous reviewers of this paper for their feedback and insight.
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Kopp, C.W., Neto-Bradley, B.M., Lipsen, L.P.J. et al. Herbarium records indicate variation in bloom-time sensitivity to temperature across a geographically diverse region. Int J Biometeorol 64, 873–880 (2020). https://doi.org/10.1007/s00484-020-01877-1
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DOI: https://doi.org/10.1007/s00484-020-01877-1