AL HAYEK, Patrick; MAALOUF, Jean Paul; TOUZARD, Blaise; MICHALET, Richard

doi:10.1111/1365-2745.12445

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AL HAYEK, Patrick
Biodiversité, Gènes & Communautés [BioGeCo]

MAALOUF, Jean Paul

TOUZARD, Blaise
Biodiversité, Gènes & Communautés [BioGeCo]

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Ce document a été publié dans

Journal of Ecology. 2015, vol. 103, n° 5, p. 1172–1182

Wiley

Résumé en anglais

1- Differences in effects between phenotypes of foundation species on subordinate species have been reported, but no study has separated their heritable and plastic components. In a subalpine community of the French Pyrenees, we observed two phenotypes of Festuca gautieri: tight cushions in dry convex outcrops with few subordinate species and loose cushions in wet concave slopes with many subordinate species, suggesting differences in effects of the two phenotypes on subordinates. 2- Using two reciprocal transplantation gardens, we studied the responses of the two phenotypes to changes in environmental conditions, thus assessing the contribution of heritability and plasticity to the phenotypic variation. Using a target cross-transplantation experiment, we assessed the plasticity and heritability bases of their contrasting effects. We also quantified the recolonization of resident plants within the reciprocally transplanted cushions. 3- We found that morphological differences between cushions had both heritability and plasticity bases. The two competition experiments showed heritable increase in competitive effects from loose to tight cushions. This was counteracted by plasticity effects, which decreased competition from the benign to the stressful garden. 4- Synthesis. We conclude that heritable effects overcome plasticity effects resulting in higher diversity in the loose phenotype from the benign habitats.< Réduire

Mots clés

phenotypic variation

plant–plant interactions

reciprocal transplantation

Mots clés en anglais

common garden

cushion plants

Festuca gautieri (bearskin fescue)

stress