Are plant populations in expanding ranges made up of escaped cultivars? The case of Ilex aquifolium in Denmark

Skou, Anne-Marie T.; Toneatto, Fiorello; Kollmann, Johannes

doi:10.1007/s11258-012-0071-z

Cited by 7 publications

(1 citation statement)

References 45 publications

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“…Berger and Veste (2007) showed a positive temperature response in this species for photosynthetic rates suggesting a potential climate-warming advantage in the species. The positive association between temperature and hydraulic functionality might also indicate the possibility for enhanced performance and opportunistic spread of the species in forest gaps, and geographic range expansion under climate-warming scenarios ( Bañuelos et al 2003, Walther et al 2005, Skou et al 2012, Stokes et al 2014.…”

Section: Climatic Variable Relationshipsmentioning

confidence: 99%

Functional adjustments of xylem anatomy to climatic variability: insights from long-termIlex aquifoliumtree-ring series

Rita¹,

Cherubini²,

Leonardi³

et al. 2015

Tree Physiol

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The present study assessed the effects of climatic conditions on radial growth and functional anatomical traits, including ring width, vessel size, vessel frequency and derived variables, i.e., potential hydraulic conductivity and xylem vulnerability to cavitation in Ilex aquifolium L. trees using long-term tree-ring time series obtained at two climatically contrasting sites, one mesic site in Switzerland (CH) and one drought-prone site in Italy (ITA). Relationships were explored by examining different xylem traits, and point pattern analysis was applied to investigate vessel clustering. We also used generalized additive models and bootstrap correlation functions to describe temperature and precipitation effects. Results indicated modified radial growth and xylem anatomy in trees over the last century; in particular, vessel frequency increased markedly at both sites in recent years, and all xylem traits examined, with the exception of xylem cavitation vulnerability, were higher at the CH mesic compared with the ITA drought site. A significant vessel clustering was observed at the ITA site, which could contribute to an enhanced tolerance to drought-induced embolism. Flat and negative relationships between vessel size and ring width were observed, suggesting carbon was not allocated to radial growth under conditions which favored stem water conduction. Finally, in most cases results indicated that climatic conditions influenced functional anatomical traits more substantially than tree radial growth, suggesting a crucial role of functional xylem anatomy in plant acclimation to future climatic conditions.

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Section: Climatic Variable Relationshipsmentioning

confidence: 99%