Abstract
To date, phenological research has provided evidence that climate warming is impacting both animals and plants, evidenced by the altered timing of phenophases. Much of the evidence supporting these findings has been provided by analysis of historic records and present-day fieldwork; herbaria have been identified recently as an alternative source of phenological data. Here, we used Rubus specimens to evaluate herbaria as potential sources of phenological data for use in climate change research and to develop the methodology for using herbaria specimens in phenological studies. Data relevant to phenology (collection date) were recorded from the information cards of over 600 herbarium specimens at Ireland’s National Herbarium in Dublin. Each specimen was assigned a score (0–5) corresponding to its phenophase. Temperature data for the study period (1852 – 2007) were obtained from the University of East Anglia’s Climate Research Unit (CRU); relationships between temperature and the dates of first flower, full flower, first fruit and full fruit were assessed using weighted linear regression. Of the five species of Rubus examined in this study, specimens of only one (R. fruticosus) were sufficiently abundant to yield statistically significant relationships with temperature. The results revealed a trend towards earlier dates of first flower, full flower and first fruit phenophases with increasing temperature. Through its multi-phenophase approach, this research serves to extend the most recent work—which validated the use of herbaria through use of a single phenophase—to confirm herbarium-based research as a robust methodology for use in future phenological studies.
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Acknowledgements
The authors would like to express their gratitude to the Irish Environmental Protection Agency (EPA) for providing financial assistance for this work, under the STRIVE programme, project number 2007-CCRP-2.4, Climate change impacts on phenology: implications for terrestrial ecosystems. We would also like to thank two anonymous reviewers for their useful comments on an earlier draft of this manuscript.
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Diskin, E., Proctor, H., Jebb, M. et al. The phenology of Rubus fruticosus in Ireland: herbarium specimens provide evidence for the response of phenophases to temperature, with implications for climate warming. Int J Biometeorol 56, 1103–1111 (2012). https://doi.org/10.1007/s00484-012-0524-z
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DOI: https://doi.org/10.1007/s00484-012-0524-z