Clarifying the role of fire heat and daily temperature fluctuations as germination cues for Mediterranean Basin obligate seeders

Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10045/38979
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Campo DCValorIdioma
dc.contributorGestión de Ecosistemas y de la Biodiversidad (GEB)es
dc.contributor.authorSantana, Víctor M.-
dc.contributor.authorBaeza, M. Jaime-
dc.contributor.authorBlanes, M. Carmen-
dc.contributor.otherUniversidad de Alicante. Departamento de Ecologíaes
dc.date.accessioned2014-07-11T08:38:17Z-
dc.date.available2014-07-11T08:38:17Z-
dc.date.issued2013-01-
dc.identifier.citationAnnals of Botany. 2013, 111(1): 127-134. doi:10.1093/aob/mcs238es
dc.identifier.issn0305-7364 (Print)-
dc.identifier.issn1095-8290 (Online)-
dc.identifier.urihttp://hdl.handle.net/10045/38979-
dc.description.abstractBackground and Aims This study aims to determine the role that both direct effects of fire and subsequent daily temperature fluctuations play in the seed bank dynamics of obligate seeders from the Mediterranean Basin. The short yet high soil temperatures experienced due to passage of fire are conflated with the lower, but longer, temperatures experienced by daily fluctuations which occur after removing vegetation. These germination cues are able to break seed dormancy, but it is difficult to assess their specific level of influence because they occur consecutively after summer fires, just before the flush of germination in the wet season (autumn). Methods By applying experimental fires, seed treatments were imposed that combined fire exposure/non-fire exposure with exposure to microhabitats under a gradient of disturbance (i.e. gaps opened by fire, mechanical brushing and intact vegetation). The seeds used were representative of the main families of obligate seeders (Ulex parviflorus, Cistus albidus and Rosmarinus officinalis). Specifically, an assessment was made of (1) the proportion of seeds killed by fire, (2) seedling emergence under field conditions and (3) seeds which remained ungerminated in soil. Key Results For the three species studied, the factors that most influenced seedling emergence and seeds remaining ungerminated were microhabitats with higher temperature fluctuations after fire (gaps opened by fire and brushing treatments). The direct effect of fire decreased the seedling emergence of U. parviflorus and reduced the proportion of seeds of R. officinalis remaining ungerminated. Conclusions The relevance of depleting vegetation (and subsequent daily temperature fluctuation in summer) suggests that studies focusing on lower temperature thresholds for breaking seed dormancy are required. This fact also supports the hypothesis that the seeding capacity in Mediterranean Basin obligate seeders may have evolved as a response to a wide range of disturbances, and not exclusively to fire.es
dc.description.sponsorshipV.M.S. has been supported by a VAli + d post-doctoral grant awarded by the Generalitat Valenciana. This research has been carried out as part of the RESILIEN (CGL 2011-30515-C02-02) and Consolider-Ingenio 2010 (GRACCIE CSD2007-00067) projects. CEAM is supported by the Generalitat Valenciana.es
dc.languageenges
dc.publisherOxford University Presses
dc.rights© The Author 2012. Published by Oxford University Press on behalf of the Annals of Botany Company. This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Annals of Botany following peer review. The definitive publisher-authenticated version "Annals of Botany. 2013, 111(1): 127-134" is available online at: http://dx.doi.org/10.1093/aob/mcs238es
dc.subjectAdaptationes
dc.subjectCistus albiduses
dc.subjectExaptationes
dc.subjectFire-adaptative traites
dc.subjectFire heates
dc.subjectPost-fire germinationes
dc.subjectRosmarinus officinalises
dc.subjectSeed bank dynamicses
dc.subjectSeedling emergencees
dc.subjectTemperature fluctuationes
dc.subjectUlex parvifloruses
dc.subject.otherEcologíaes
dc.titleClarifying the role of fire heat and daily temperature fluctuations as germination cues for Mediterranean Basin obligate seederses
dc.typeinfo:eu-repo/semantics/articlees
dc.peerreviewedsies
dc.identifier.doi10.1093/aob/mcs238-
dc.relation.publisherversionhttp://dx.doi.org/10.1093/aob/mcs238es
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.projectIDinfo:eu-repo/grantAgreement/MICINN//CGL2011-30515-C02-02-
dc.relation.projectIDinfo:eu-repo/grantAgreement/MEC//CSD2007-00067-
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