On the relative importance of the effects of selection and complementarity as drivers of diversity-productivity relationships in Mediterranean shrublands

Nicolas Montès (1, 2) , Fernando T. Maestre (3) , Christine C. Ballini (1) , Virginie Baldy (1, 4) , Thierry Gauquelin (1, 2) , Mathieu Planquette (1) , Stephane Greff (1, 2) , Sylvie Dupouyet (1) , Jean-Baptiste Perret (1)

1 IMEP - Institut Méditerranéen d'Ecologie et de Paléoécologie
2 IMBE - Institut méditerranéen de biodiversité et d'écologie marine et continentale
3 Area de Biodiversidad y Conservaciín
4 CESAC - Centre d'Ecologie des Systèmes Aquatiques Continentaux

Extensive research has been devoted to understanding the role of biodiversity as a driver of ecosystem functioning. However, no previous study has evaluated the relative contribution of complementarity and selection to productivity in shrublands. We have attempted to do this for a Mediterranean shrubland dominated by Quercus coccifera, Cistus albidus, Ulex parviflorus and Rosmarinus officinalis. We found a highly significant and linear positive relationship between productivity and species richness. No selection effect was apparent, but both the complementarity and net effects were highly significant. The magnitude of these effects increased from two to three species, but became non-significant in the four-species mixtures. Analysis of paitwise interactions revealed that legumes did not promote overyielding. Complementarity was mostly driven by Cistus, which always performed better when growing with other species than when growing with conspecifics. Our results are an addition to the still scarce literature dealing with diversity-productivity relationships in communities dominated by woody species, and show that methodologies commonly used to assess complementarity may not provide a precise estimation when a given species has negative effects on its conspecifics.

Domaines: Sciences de l'environnement; Biodiversité et Ecologie

Nicolas Montès, Fernando T. Maestre, Christine C. Ballini, Virginie Baldy, Thierry Gauquelin, et al.. On the relative importance of the effects of selection and complementarity as drivers of diversity-productivity relationships in Mediterranean shrublands. Oikos, 2008, 117 (9), pp.1345 - 1350. ⟨10.1111/j.0030-1299.2008.16910.x⟩. ⟨hal-01764639⟩