Plant Ecology

, Volume 216, Issue 2, pp 177–187 | Cite as

The high vulnerability of Quercus robur to drought at its southern margin paves the way for Quercus ilex

  • Morgane UrliEmail author
  • Jean-Baptiste Lamy
  • Fabrice Sin
  • Régis Burlett
  • Sylvain Delzon
  • Annabel J. Porté


Populations growing at the warm margins of the species’ range are more prone to experience higher water stress compared to populations inhabiting the core of their distribution. Thus, assessing tree vulnerability to drought is crucial to improve prediction of forest mortality and species range limits. We quantified the abundance of two oak species (Quercus robur and Quercus ilex) along a water stress gradient in a coastal forest located at the southern edge of the distribution of Q. robur. We assessed their ecophysiological responses to drought during a wet and a dry year and determined their vulnerability to drought under field conditions. The abundance of Q. ilex was high all along the water stress gradient, whereas the abundance of Q. robur dramatically declined with decreasing water availability. During dry years, the level of native embolism was significantly higher for Q. robur than for Q. ilex due to species differences in vulnerability to xylem cavitation. Q. robur had a narrower hydraulic safety margin than Q. ilex and operated very close to the species threshold of hydraulic failure, making it highly vulnerable to drought-induced mortality. In the current context of increasing drought frequency and severity, survival of Q. robur populations will be threatened at warm range margins.


Tree distribution Hydraulic safety margin Climate change Drought Quercus robur Quercus ilex 



We thank Jean-Pierre Coste, David Robert, Pierre Assié, Philippe Bériou, and François Bottin of the French National Forest Office for technical assistance in the field. We also thank Yann Guengant, Clément Chomeau, and the Experimental Unit of Pierroton for the help with the experiment. This project was supported by the Baccara FP7-KBBE-2008-2-B no. 226299. M.U. was supported by a PhD Grant from the AXA Research Fund.

Supplementary material

11258_2014_426_MOESM1_ESM.doc (78 kb)
Supplementary material 1 (DOC 77 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Morgane Urli
    • 1
    • 2
    • 4
    Email author
  • Jean-Baptiste Lamy
    • 1
    • 2
  • Fabrice Sin
    • 3
  • Régis Burlett
    • 1
    • 2
  • Sylvain Delzon
    • 1
    • 2
  • Annabel J. Porté
    • 1
    • 2
  1. 1.INRA, UMR 1202 BIOGECOCestasFrance
  2. 2.Université de Bordeaux, UMR 1202 BIOGECOTalenceFrance
  3. 3.ONFBrugesFrance
  4. 4.Département de biologieUniversité de SherbrookeSherbrookeCanada

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