Herbarium specimens can reveal impacts of climate change on plant phenology; a review of methods and applications.

PeerJ · 2018 · PMC5888139 · PMID 29632745

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an interesting trendno p-value reported

Bertin (2015) found an interesting trend that supported the effect of spring temperatures: the earlier a species’ mean flowering time occurred in the spring, the more the species’ mean dates had shifted toward an earlier day of year over time.

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