Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta

BACKGROUND AND AIMS: The competition–colonization trade-off theory postulates that the competitive and colonizing abilities of organisms are negatively related; this trade-off has been proposed as a major force in the maintenance of diversity. In plants, the competition–colonization trade-off is oft...

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Main Authors: Dubois, Jonathan, Cheptou, Pierre-Olivier
Formato: Artigo
Idioma:Inglês
Publicado em: Oxford University Press 2012
Assuntos:
Original Articles
Acesso em linha:https://ncbi.nlm.nih.gov/pmc/articles/PMC3478060/
https://ncbi.nlm.nih.gov/pubmed/23022677
https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1093/aob/mcs203
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spelling pubmed-34780602013-11-01 Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta Dubois, Jonathan Cheptou, Pierre-Olivier Ann Bot Original Articles BACKGROUND AND AIMS: The competition–colonization trade-off theory postulates that the competitive and colonizing abilities of organisms are negatively related; this trade-off has been proposed as a major force in the maintenance of diversity. In plants, the competition–colonization trade-off is often considered to result from variation in resource partitioning, thus generating heavy competitive (non-dispersing) seeds and light (dispersing) non-competitive seeds. Here, the possibility is explored that early germination provides a competitive advantage, thus mediating competitive interactions. METHODS: Using eight populations of the heterocarpic species Crepis sancta (Asteraceae), the possibility was tested that dispersing and non-dispersing achenes differ in germination timing, and the impact of early germination on individual fitness components was analysed in the context of intraspecific competition. To evaluate whether seed reserve varies among achene types, endosperm size was also measured by analysing photographs of cross-sections taken under a binocular microscope. KEY RESULTS AND CONCLUSIONS: The results show that non-dispersing achenes germinated 4 d earlier (on average) than dispersing achenes. It is also shown that early germination provides a positive advantage for the survival and final biomass of individuals, a pattern that was consistent over the eight populations and independent of achene type. Dispersing and non-dispersing achenes did not differ in terms of seed reserve (endosperm size). It is proposed that germination phenology may mediate the competition–colonization trade-off in Crepis sancta and the evolutionary significance of this phenomenon is discussed. Oxford University Press 2012-11 2012-09-28 /pmc/articles/PMC3478060/ /pubmed/23022677 http://dx.doi.org/10.1093/aob/mcs203 Text en © The Author 2012. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oup.com
institution US NLM
collection PubMed Central
language Inglês
format Artigo
topic Original Articles
spellingShingle Original Articles
Dubois, Jonathan
Cheptou, Pierre-Olivier
Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta
description BACKGROUND AND AIMS: The competition–colonization trade-off theory postulates that the competitive and colonizing abilities of organisms are negatively related; this trade-off has been proposed as a major force in the maintenance of diversity. In plants, the competition–colonization trade-off is often considered to result from variation in resource partitioning, thus generating heavy competitive (non-dispersing) seeds and light (dispersing) non-competitive seeds. Here, the possibility is explored that early germination provides a competitive advantage, thus mediating competitive interactions. METHODS: Using eight populations of the heterocarpic species Crepis sancta (Asteraceae), the possibility was tested that dispersing and non-dispersing achenes differ in germination timing, and the impact of early germination on individual fitness components was analysed in the context of intraspecific competition. To evaluate whether seed reserve varies among achene types, endosperm size was also measured by analysing photographs of cross-sections taken under a binocular microscope. KEY RESULTS AND CONCLUSIONS: The results show that non-dispersing achenes germinated 4 d earlier (on average) than dispersing achenes. It is also shown that early germination provides a positive advantage for the survival and final biomass of individuals, a pattern that was consistent over the eight populations and independent of achene type. Dispersing and non-dispersing achenes did not differ in terms of seed reserve (endosperm size). It is proposed that germination phenology may mediate the competition–colonization trade-off in Crepis sancta and the evolutionary significance of this phenomenon is discussed.
author Dubois, Jonathan
Cheptou, Pierre-Olivier
author_facet Dubois, Jonathan
Cheptou, Pierre-Olivier
author_sort Dubois, Jonathan
title Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta
title_short Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta
title_full Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta
title_fullStr Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta
title_full_unstemmed Competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species Crepis sancta
title_sort competition/colonization syndrome mediated by early germination in non-dispersing achenes in the heteromorphic species crepis sancta
publisher Oxford University Press
publishDate 2012
url https://ncbi.nlm.nih.gov/pmc/articles/PMC3478060/
https://ncbi.nlm.nih.gov/pubmed/23022677
https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1093/aob/mcs203
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