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Day length unlikely to constrain climate-driven shifts in leaf-out times of northern woody plants
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Day length unlikely to constrain climate-driven shifts in leaf-out times of northern woody plants
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Journal Article
Day length unlikely to constrain climate-driven shifts in leaf-out times of northern woody plants
2016
Overview
Photoperiod is only an important leaf-out regulator for woody plants in areas with short winters and in lineages that derive from lower latitudes. Consequently, photoperiod constraint on range expansion should be limited to these areas and species.
The relative roles of temperature and day length in driving spring leaf unfolding are known for few species, limiting our ability to predict phenology under climate warming
1
,
2
. Using experimental data, we assess the importance of photoperiod as a leaf-out regulator in 173 woody species from throughout the Northern Hemisphere, and we also infer the influence of winter duration, temperature seasonality, and inter-annual temperature variability. We combine results from climate- and light-controlled chambers with species’ native climate niches inferred from georeferenced occurrences and range maps. Of the 173 species, only 35% relied on spring photoperiod as a leaf-out signal. Contrary to previous suggestions, these species come from lower latitudes, whereas species from high latitudes with long winters leafed out independent of photoperiod. The strong effect of species’ geographic–climatic history on phenological strategies complicates the prediction of community-wide phenological change.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
