Aims Harsh edaphic environments harbor species with different soil affinities. Plant's responses to specific edaphic constraints may be compromised against responses to prevalent stresses shared with other semiarid environments. We expect that species with high edaphic affinity may show traits to overcome harsh soil properties, while species with low affinity may respond to environmental constraints shared with arid environments. Methods We quantified the edaphic affinity of 12 plant species co-occurring in gypsum outcrops and measured traits related to plant responses to specific gypsum constraints (rooting and water uptake depth, foliar accumulation of Ca, S and Mg), and traits related to common constraints of arid environments (water use efficiency, macronutrients foliar content). Results Plants in gypsum outcrops differed in their strategies to face edaphic limitations. A phylogenetic informed PCA segregated species based on their foliar Ca and S accumulation and greater water uptake depths, associated with plant responses to specific gypsum limitations. Species' gypsum affinity explained this segregation, but traits related to water or nutrient use efficiency did not contribute substantially to this axis. Conclusions Plant's specializations to respond to specific edaphic constraints of gypsum soils do not limit their ability to deal with other non-specific environmental constraints.

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Using stable isotopes of oxygen from tree-rings to study the origin of past flood events: first results from the iberian peninsula Utilisation des isotopes stables de l'oxygène des cernes d'arbres pour déterminer l'origine des inondations passées : premiers résultats pour la péninsule ibérique