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dc.rights.licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/ve/
dc.contributor.authorRada R., Fermin J.
dc.contributor.authorGarcía Nuñez, Carlos
dc.contributor.authorRangel, Sairo
dc.date.accessioned2014-11-17T15:07:36Z
dc.date.available2014-11-17T15:07:36Z
dc.date.issued2009-10
dc.identifier.urihttp://www.saber.ula.ve/handle/123456789/39341
dc.description.abstractThe frequent occurrence of all year-round below zero temperatures in tropical high mountains constitutes a most stressful climatic factor that plants have to confront. Polylepis forests are found well above the continuous forest line and are distributed throughout the Andean range. These trees require particular traits to overcome functional limitations imposed on them at such altitudes. Considering seedling and sapling stages as filter phases in stressful environments, some functional aspects of the regeneration of Polylepis sericea, a species associated to rock outcrops in the Venezuelan Andes, were studied. We characterized microclimatic conditions within a forest, in a forest gap and surrounding open pa´ramo and determined low temperature resistance mechanisms in seedlings, saplings and ramets. Conditions in the forest understory were more stable compared to the forest gaps and open surrounding pa´ramo. Minimum temperatures close to the ground were 3.6 C lower in the open pa´ramo compared to the forest understory. Maximum temperatures were 9.0 C higher in the open pa´ramo. Ice nucleation and injury temperatures occurred between 6 and 8 C for both ramets and saplings, an evidence of frost avoidance to low nighttime temperatures. In this particular forest, this resistance ability is determinant in their island-like distribution in very specific less severe temperature habitats.es_VE
dc.language.isoenes_VE
dc.publisherActa Oecologica 35(5): 610–613es_VE
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectTropical high mountainses_VE
dc.subjectTreelinees_VE
dc.subjectRock outcropingses_VE
dc.subjectLow temperature avoidancees_VE
dc.titleLow temperature resistance in saplings and ramets of Polylepis sericea in the Venezuelan Andeses_VE
dc.typeinfo:eu-repo/semantics/article
dc.description.colacion610–613.es_VE
dc.description.emailfrada@ula.vees_VE
dc.description.emailcgarcia@ula.vees_VE
dc.publisher.paisPaíses Bajoses_VE
dc.subject.facultadFacultad de Cienciases_VE
dc.subject.institucionUniversidad de Los Andeses_VE
dc.subject.thematiccategoryBiologíaes_VE
dc.subject.tipoArtículoses_VE
dc.subject.unidadinvInstituto de Ciencias Ambientales y Ecológicas (ICAE)es_VE
dc.type.mediaTextoes_VE


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