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Variation and covariation among life-history traits in Rumex acetosella from a successional old-field gradient

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Abstract

In this study morphological variation and the potential for competition to affect biomass and seedling selection of the families of five populations of Rumex acetosella L. sampled along a successional old-field gradient have been investigated. Seeds from 25 families were submitted to four competitive regimes: no competition (one plant per pot), medium competition (two plants/ pot taking plants from the same population), high within-population competition (four individuals from the same population in a pot) and high between-population competition (four individuals from two different populations in a pot). Eight traits were analysed after 3 months of growth for variation among families within populations. A significant difference among families within the two older populations was recorded for sexual biomass and related components. High sensitivity of these traits to density was observed in all populations except the youngest, suggesting specialization to particular environmental conditions in late successional populations, and a good adaptive capacity to buffer environmental variation in the pioneer population. Little significant interaction between competitive regimes and families within populations was found, i.e. genotypes within each population showed little variation in their response to environmental variation. Genotypic variance decreased with increasing competitive conditions for the majority of the traits. However, the percentage of variance in sexual reproduction explained by family was stable among treatments. Tradeoffs between vegetative reproduction and sexual reproduction were recorded at the population level along the successional gradient, with increasing competitive conditions. As succession proceeds, we observed a decrease in sexual reproduction and an increase in vegetative reproduction. At the family level, correlation among traits were similar when plants were grown in the absence of competition and at high density, with a significant negative correlation between sexual reproduction and vegetative reproduction. For both sprout number and sexual biomass, the performance of families grown under all the treatments was positively correlated. Together these results indicate allocational constraints on the reproductive biology of R. acetosella that may be favoured by natural selection and have influenced population differentiation along the successional gradient. However, they also revealed that the potential exists for evolutionary specialization through plasticity, in response to variation in environmental conditions.

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  1. Claudie Houssard

    Present address: Centre d'Ecologie Fonctionnelle et Evolutive, CNRS, BP 5051, F-34033, Montpellier cedex, France

Authors and Affiliations

  1. Laboratoire de Systématique et Ecologie Végétales, Université Paris XI, Bât. 365, F-91405, Orsay cedex, France

    Claudie Houssard & José Escarré

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  1. Claudie Houssard
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  2. José Escarré
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Houssard, C., Escarré, J. Variation and covariation among life-history traits in Rumex acetosella from a successional old-field gradient. Oecologia 102, 70–80 (1995). https://doi.org/10.1007/BF00333312

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  • DOI: https://doi.org/10.1007/BF00333312

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