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Differential effects of contrasting phenotypes of a foundation legume shrub drive plant-plant interactions in a Mediterranean mountain

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorAL HAYEK, Patrick
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMAALOUF, Jean-Paul
hal.structure.identifierInstitut méditerranéen de biodiversité et d'écologie marine et continentale [IMBE]
dc.contributor.authorBAUMEL, Alex
dc.contributor.authorDAGHER-KHARRAT, Magda Bou
hal.structure.identifierInstitut méditerranéen de biodiversité et d'écologie marine et continentale [IMBE]
hal.structure.identifierAix Marseille Université [AMU]
hal.structure.identifierInstitut de Recherche pour le Développement [IRD]
hal.structure.identifierAvignon Université [AU]
dc.contributor.authorMÉDAIL, Frédéric
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTOUZARD, Blaise
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorMICHALET, Richard
dc.date.issued2015-03
dc.identifier.issn1100-9233
dc.description.abstractEnQuestionsAre variable effects of different phenotypes of foundation plant species on subordinates across contrasting habitat conditions (with varying stress and disturbance levels) due to either varying environmental conditions or heritable differences in traits between phenotypes? To evaluate the contribution of environmental effects we quantified the effects of contrasting phenotypes of a foundation legume shrub on their subordinate species across exposure (drought stress) and grazing conditions. LocationA sub-alpine xerophytic community of western Mount Lebanon, Lebanon. MethodsFor two phenotypes of the spiny cushion shrub Onobrychis cornuta, a facilitative phenotype that occurs in concave topographies (mesic soil) and a competitive phenotype that occurs in convex topographies (xeric soil), we quantified cushion traits, environmental conditions and subordinate plant species abundances (within and outside the cushions) for the two phenotypes in northern (low stress) and southern (high stress) exposures, and with and without grazing. Relative interaction index (RII) for subordinate species richness and abundance was calculated in the eight treatment combinations and a correspondence analysis (CA) was conducted on species composition. ResultsDrought stress exacerbated phenotypic effects in southern exposure, with loose phenotypes being more facilitative and tight phenotypes more competitive than in northern exposure. This was related to both changes in cushion traits of the two phenotypes and to an increase in the pool of subordinate species sensitive to cushion effects. In contrast, grazing increased cushion positive effects of both phenotypes through the occurrence of indirect facilitation, with loose phenotypes becoming more facilitative and tight phenotypes less competitive. This was due both to changes in cushion traits of the two phenotypes and to their shared spiny phenotype limiting grazing effects. ConclusionsBecause increasing stress from northern to southern exposure did not increase competitive effects of either phenotype, and because the cessation of grazing did not cancel out differences in facilitative effects between phenotypes, neither drought stress nor grazing disturbance appeared to be the main drivers of the observed phenotypic effects on subordinate species across habitats. We conclude that differences in phenotypic effects of this legume shrub are very likely due to heritable differences in traits between phenotypes.
dc.language.isoen
dc.publisherWiley
dc.subjectexposure
dc.subjectfacilitation
dc.subjectindirect facilitation
dc.subject.encommunity phenotypes
dc.subject.encompetition
dc.subject.encushion plants
dc.subject.enfoundation species
dc.subject.engrazing
dc.subject.enMount Lebanon
dc.subject.enOnobrychis cornuta
dc.title.enDifferential effects of contrasting phenotypes of a foundation legume shrub drive plant-plant interactions in a Mediterranean mountain
dc.typeArticle de revue
dc.identifier.doi10.1111/jvs.12246
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.journalJournal of Vegetation Science
bordeaux.page373--384
bordeaux.volume26
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-01445185
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01445185v1
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