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Temporal change and determinants of maternal reproductive success in an expanding oak forest stand

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorGERZABEK, Gabriel
hal.structure.identifierEcologie des Forêts Méditerranéennes [URFM]
dc.contributor.authorMURATORIO, Sylvie
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorHAMPE, Arndt
dc.date.issued2017
dc.identifier.issn0022-0477
dc.description.abstractEn1- Global change is generating widespread local-scale expansions of tree populations. During demographic expansions, even small differences in individual reproductive success can generate large differences in the genetic composition of the resulting population. Colonizing tree populations almost invariably show highly skewed distributions of seed production, but the evolution of this reproductive skew during plant recruitment remains understudied.2- We examine how recruit mortality modifies initial patterns of acorn dispersal and maternal reproductive success in a recently established, expanding Pedunculate oak (Quercus robur) forest stand and test different predictors of successful recruit establishment.3- We mapped and genotyped a cohort of seedlings (n = 809) emerging within and around the stand (n = 254 adult trees), identified their habitats and monitored their fate until an age of 3 years. Their mother trees were inferred by Bayesian parentage analysis, and the number of assigned descendants was used as a proxy for tree maternal fertility. We examined temporal trends in tree fertility and patterns of dispersal, and tested effects of seed number-quality trade-offs, dispersal failure, dispersal distance and habitat of propagule arrival on the probability of seedling establishment.4- We observed marked inequality in maternal reproductive success at the time of seedling emergence. A positive relationship between tree fertility and the proportion of non-dispersed seedlings pointed to disperser satiation. An overall seedling mortality of 69% generated considerable reshuffling in the fertility ranking of individual trees. Non-dispersal more than doubled seedling mortality. The establishment success of actually dispersed seedlings was independent of mother fertility and dispersal distance but strongly related to the habitat of arrival. Recruit survival was markedly higher in pine plantations or non-forested areas than in broadleaved forest.5- Synthesis. A few highly fertile trees dominated reproduction in the stand. Differential recruitment success tended to reduce their initial advantage, however, suggesting that reproductive inequality might rapidly decline as more trees start to reproduce along the expansion process. Our results also suggest that field estimates of size or seed production are unlikely to provide reliable estimates of lifetime reproductive success in trees.
dc.description.sponsorshipScénarios pour la dynamique de la biodiversité des forêts européennes sous changement global identifier les points de basculement micro-evolutifs - ANR-12-EBID-0003
dc.language.isoen
dc.publisherWiley
dc.subjectexpansion démographique
dc.subjectchangement global
dc.subjectdispersion
dc.subjectreproduction végétale
dc.subjectflux de gènes
dc.subjectquercus robur
dc.subjectgénotype
dc.subjectcarte génétique
dc.subject.endemographic expansion
dc.subject.endispersal
dc.subject.endisperser satiation
dc.subject.endistance-dependent mortality
dc.subject.englobal change
dc.subject.enreproductive inequality
dc.subject.ensecondary forest
dc.subject.enseed dispersal kernel
dc.subject.enseedling recruitment
dc.subject.endissemination
dc.subject.enplant reproduction
dc.subject.enpedunculate oak
dc.subject.engenetic mapping
dc.title.enTemporal change and determinants of maternal reproductive success in an expanding oak forest stand
dc.typeArticle de revue
dc.identifier.doi10.1111/1365-2745.12677
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalJournal of Ecology
bordeaux.page39-48
bordeaux.volume105
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-01607683
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01607683v1
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