Chilling and heat requirements for leaf unfolding in European beech and sessile oak populations at their southern range of distribution

Cécile F. Dantec1,2, Yann Vitasse3, Marc Bonhomme4,5, Jean-Marc Louvet1,2, Antoine Kremer1,2 and Sylvain Delzon1,2

1 INRA, UMR 1202 BIOGECO, F-33610 Cestas, France

2 Université de Bordeaux, UMR 1202 BIOGECO, F-33610 Cestas, France

3 Institute of Botany, University of Basel, 4056 Basel, Switzerland

4 INRA, UMRA547 PIAF, F-63100 Clermont-Ferrand, France

5 Clermont Université, Université Blaise Pascal, UMRA547 PIAF, F-63000 Clermont-Ferrand, France

Corresponding author:

Sylvain Delzon

Email:

Tel: +33 5 40 00 38 91/ Fax: +33 5 40 00 36 57

For submission to: International Journal of Biometeorology

Table S1 Slopes of the linear regressions representing mean date of leaf unfolding against mean spring temperature by year (calculated from February 1 to May 31) for populations of Quercus petraea and Fagus sylvatica monitored across two elevation gradients in the Pyrenees mountains, from 2005 to 2007 and 2009 to 2012 (R², coefficient of determination)

Quercus petraea / Fagus sylvatica
year / slope / R² / slope / R²
2005 / -7.72x / 0.93 / -2.14x / 0.77
2006 / -6.92x / 0.89 / -1.56x / 0.50
2007 / -5.52x / 0.91 / -1.80x / 0.59
2009 / -8.01x / 0.89 / -3.50x / 0.81
2010 / -6.74x / 0.95 / -4.34x / 0.92
2011 / -5.44x / 0.89 / -2.90x / 0.72
2012 / -8.04x / 0.93 / -2.39x / 0.82
All years / -6.48x / 0.87 / -2.76x / 0.71

Fig. S1 Representation of the winter mean temperatures (calculated from the November 1st to the end of February) from 1931 to 2011 in Lourdes (43°06’18’’N; 00°03’42’’O)