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Abstract
In arid ecosystems, recruitment dynamics are limited by harsh environmental conditions and greatly depend on the net outcome of the balance between facilitation and competition. This outcome can change as a consequence of degradation caused by livestock overgrazing. Also, distinct plant species may show a differential response to a common neighbour under the same environmental conditions. Therefore, ecosystem degradation could affect the net balance of [ver mas...]
dc.contributor.authorLopez, Dardo Ruben
dc.contributor.authorCavallero, Laura
dc.date.accessioned2018-07-04T15:12:34Z
dc.date.available2018-07-04T15:12:34Z
dc.date.issued2017-02-16
dc.identifier.issn1146-609X
dc.identifier.issn1873-6238
dc.identifier.otherhttp://dx.doi.org/10.1016/j.actao.2017.01.003
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S1146609X17300176?via%3Dihub
dc.identifier.urihttp://hdl.handle.net/20.500.12123/2726
dc.description.abstractIn arid ecosystems, recruitment dynamics are limited by harsh environmental conditions and greatly depend on the net outcome of the balance between facilitation and competition. This outcome can change as a consequence of degradation caused by livestock overgrazing. Also, distinct plant species may show a differential response to a common neighbour under the same environmental conditions. Therefore, ecosystem degradation could affect the net balance of plant-plant interactions, which can also depend on the functional traits of potential nurse species. The aim of this study is to assess the influence of alternative degradation states on (i) the density of seedlings of perennial species emerging in four microsite types, and on (ii) the relative interaction intensity (RII) between seedlings and potential nurses belonging to three functional types (deep- and shallow-rooted shrubs, and tussock grasses). During three years, we recorded seedling density of perennial species in four alternative degradation states in grassshrubby steppes from northwestern Patagonia. The density of emerged seedlings of perennial species decreased sharply as degradation increased, showing non-linear responses in most microsites. Seedling density underneath deep-rooted shrubs was higher than underneath shallow-rooted shrubs and tussock grasses. Also, deep-rooted shrubs were the only functional type that recorded seedling emergence in highly degraded states. Deep-rooted shrubs had facilitative effects on the seedlings emerging and surviving underneath them, independently of ecosystem degradation. In contrast, RII between shallowrooted shrubs and recently emerged seedlings, switched from positive effects in the less degraded states, to negative effects in the most degraded state. Tussock grasses recorded the weakest intensity of facilitative interactions with recently emerged seedlings, switching to competitive interactions as degradation increased. Our results suggest that species with key functional traits should be considered in management and restoration plans for rangelands with different degradation levels, since they have a strong influence in the net outcome of plant-plant interactions and in the recruitment dynamics of arid ecosystems.es_AR
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.relationinfo:eu-repograntAgreement/INTA/CORDO/1262204/AR./Gestión de la innovación en el territorio del arco noroeste de la provincia de Córdoba.es_AR
dc.relationinfo:eu-repograntAgreement/INTA/PNPA/1126074/AR./Desarrollo, Integración y transferencia de tecnologías para manejo sustentable de servicios de la vegetación natural para fines ganaderos.es_AR
dc.relationinfo:eu-repograntAgreement/INTA/PNNAT/1128051/AR./Gestión de biodiversidad, servicios ecosistémicos, impactos y resiliencia socio agroambiental en sistemas productivos.es_AR
dc.relationinfo:eu-repograntAgreement/INTA/PNFOR/1104082/AR./Herramientas para contribuir al manejo y el uso múltiple sustentable de bosques nativos.es_AR
dc.relationinfo:eu-repograntAgreement/INTA/PNFOR/1104083/AR./Manejo de sistemas silvopastoriles en bosques nativos.es_AR
dc.relationinfo:eu-repograntAgreement/INTA/PNAGUA/1133023/AR./Tecnologías para la gestión del agua en cuencas rurales.es_AR
dc.relationinfo:eu-repograntAgreement/INTA/PNBIO/1131044/AR./Genómica aplicada a estudios de ecología molecular y diversidad genética.es_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceActa Oecologica 79 : 70-80 (February 2017)es_AR
dc.subjectEcosystemseng
dc.subjectEcosistemaes_AR
dc.subjectArid Zoneseng
dc.subjectZona Aridaes_AR
dc.subjectEnvironmental Controleng
dc.subjectControl Ambientales_AR
dc.subjectEnvironmental Iimpacteng
dc.subjectImpacto Ambientales_AR
dc.subject.otherUmbral Críticoes_AR
dc.titleThe role of nurse functional types in seedling recruitment dynamics of alternative states in rangelands.es_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Manfredies_AR
dc.description.filFil: López, Dardo R. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi. Campo Anexo Villa Dolores; Argentinaes_AR
dc.description.filFil: Cavallero, Laura. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi. Campo Anexo Villa Dolores; Argentina. Consejo Nacional de Investigaciones Científicas y Tècnicas; Argentinaes_AR
dc.subtypecientifico


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