Abstract
This study has been funded by Projects CGL2005-02041/BOS and CGL2010-21933-C02-02 from the Spanish ministry of Education and Science, and Project SC000207 of the “Consejeria de medio Ambiente y Desarrollo Rural de la Junta de Castilla-La mancha” of Spain. Francisca Cea kindly helped with statistical issues. Helen Warburton kindly offered valuable suggestions to improve the English version of the manuscript.
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