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A Regional Assessment of Changes in Plant–Plant Interactions Along Topography Gradients in Tunisian Sebkhas

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCHAIEB, Ghassen
dc.contributor.authorABDELLY, Chedly
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMICHALET, Richard
dc.date.accessioned2023-11-20T09:30:12Z
dc.date.available2023-11-20T09:30:12Z
dc.date.issued2020-10-06
dc.identifier.issn1432-9840en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/184840
dc.description.abstractEnFacilitation among plants in dry ecosystems is crucial for diversity and ecosystem functioning and stability. However, the importance of facilitation in extremely stressful conditions is highly debated. We attempt to separate the effects of direct non-resource and resource stress factors on plant–plant interactions by assessing changes in facilitation and competition along salinity gradients at two contrasting levels of aridity. We selected eight saline depressions (hereafter sebkhas) in the wet and dry Mediterranean arid climate of North Africa, from central Tunisia to the Libyan border 500 km south-eastward. In each sebkha, we transplanted at four positions along the salinity gradient induced by topography, both in open areas and below dominant shrubs, three target species with contrasting tolerances to salinity stress. Target plant survival, soil electrical conductivity and moisture were recorded before and after the dry summer season in all treatments. Shrubs decreased salinity and drought stresses in all treatments, and facilitation was the dominant interaction. However, we found a strong collapse of facilitation along the salinity gradient, due to a dramatic mortality of the three target species both with and without neighbours above their threshold of salinity tolerance. Increasing aridity induced an earlier collapse of facilitation along the gradient. The three target species had contrasting responses to neighbours, with the least stress-tolerant species being facilitated and the two most stress-tolerant ones negatively affected by neighbours. Our study shows that disentangling resource and non-resource stresses along gradients and controlling for target species effects help understanding variation in plant–plant interactions under highly stressful conditions. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
dc.language.isoENen_US
dc.subject.enCollapse of facilitation
dc.subject.encompetition
dc.subject.endrought
dc.subject.enMediterranean climate
dc.subject.ennon-resource factors
dc.subject.enresource factors
dc.subject.ensalinity
dc.title.enA Regional Assessment of Changes in Plant–Plant Interactions Along Topography Gradients in Tunisian Sebkhas
dc.typeArticle de revueen_US
dc.identifier.doi10.1007/s10021-020-00567-8en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalEcosystemsen_US
bordeaux.page1024-1037en_US
bordeaux.volume24en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue5en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.teamECOBIOC
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-04294835
hal.version1
hal.date.transferred2023-11-20T09:30:15Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Ecosystems&rft.date=2020-10-06&rft.volume=24&rft.issue=5&rft.spage=1024-1037&rft.epage=1024-1037&rft.eissn=1432-9840&rft.issn=1432-9840&rft.au=CHAIEB,%20Ghassen&ABDELLY,%20Chedly&MICHALET,%20Richard&rft.genre=article


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