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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Enhanced UV-B and Elevated CO2 Impacts Sub-Arctic Shrub Berry Abundance, Quality and Seed Germination
Auteurs :	Dylan Gwynn-Jones, Auteur ; Alan G. Jones, Auteur ; Alice Waterhouse, Auteur ; Ana Winters, Auteur ; David Comont, Auteur ; John Scullion, Auteur ; Rosie Gardias, Auteur ; Bente J. Graae, Auteur ; John A. Lee, Auteur ; Terry V. Callaghan, Auteur
Type de document :	Article
Dans :	AMBIO (41 JUL 2012)
Article en page(s) :	256-268
Langues:	Anglais
Résumé :	This study investigated the effects of long-term-enhanced UV-B, and combined UV-B with elevated CO2 on dwarf shrub berry characteristics in a sub-arctic heath community. Germination of Vaccinium myrtillus was enhanced in seeds produced at elevated UV-B, but seed numbers and berry size were unaffected. Elevated UV-B and CO2 stimulated the abundance of V. myrtillus berries, whilst UV-B alone stimulated the berry abundance of V. vitis-idaea and Empetrum hermaphroditum. Enhanced UV-B reduced concentrations of several polyphenolics in V. myrtillus berries, whilst elevated CO2 increased quercetin glycosides in V. myrtillus, and syringetin glycosides and anthocyanins in E. hermaphroditum berries. UV-B x CO2 interactions were found for total anthocyanins, delphinidin-3-hexoside and peonidin-3-pentosidein in V. myrtillus berries but not E. hermaphroditum. Results suggest positive impacts of UV-B on the germination of V. myrtillus and species-specific impacts of UV-B x elevated CO2 on berry abundance and quality. The findings have relevance and implications for human and animal consumers plus seed dispersal and seedling establishment.

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