Selection in modular organisms: Is intraclonal variation in macroalgae evolutionarily important?

Monro, Keyne and Poore, Alistair (2004) Selection in modular organisms: Is intraclonal variation in macroalgae evolutionarily important?. The American Naturalist, 163 4: 564-578. doi:10.1086/382551

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Author Monro, Keyne
Poore, Alistair
Title Selection in modular organisms: Is intraclonal variation in macroalgae evolutionarily important?
Journal name The American Naturalist   Check publisher's open access policy
ISSN 0003-0147
Publication date 2004-04-19
Sub-type Article (original research)
DOI 10.1086/382551
Open Access Status File (Publisher version)
Volume 163
Issue 4
Start page 564
End page 578
Total pages 15
Place of publication Chicago, IL, United States
Publisher The University of Chicago Press
Language eng
Subject 0607 Plant Biology
Formatted abstract
Theoretical and practical difficulties occur when defining the units of selection in modular organisms that grow by iteration of repeated parts (modules). Modules may become physically autonomous through fragmentation and may vary because of genetic variation arising in somatic cell lineages. Since cells destined for gamete production are not sequestered in early development, heritable variation and selection among asexual progeny are possible. We used the branching red macroalgae Delisea pulchra and Asparagopsis armata to test whether modules fulfill three fundamental criteria for units of selection: that they replicate, that they display heritable variation, and that selective agents distinguish among the variants. We detected significant phenotypic variation among modules for fitness-related traits (growth, secondary metabolite concentrations, and rates of tissue loss to herbivory) in each species and significant heritability estimates for secondary metabolite production and tissue loss to herbivory in D.pulchra.Variation in growth rate among A. armata modules was largely phenotypic with small but important estimates of genetic variation. Our results indicate that selection may indeed act on phenotypic variation among modules within individuals and that this process may effect evolutionary change within asexual lineages given sufficient genetic variation in the traits examined.
Keyword intraclonal variation
units of selection
modular organisms
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 16 times in Scopus Article | Citations
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Created: Fri, 08 Jan 2010, 11:48:06 EST by Therese Egan on behalf of Faculty of Science