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Reproductive strategies and isolation-by-demography in a marine clonal plant along an eutrophication gradient.

Abstract

Genetic diversity in clonal organisms includes two distinct components, (i) the diversity of genotypes or clones (i.e. genotypic richness) in a population and (ii) that of the alleles (i.e. allelic and gene diversity within populations, and differentiation between populations). We investigated how population differentiation and genotypic components are associated across a gradient of eutrophication in a clonal marine plant. To that end, we combined direct measurements of sexual allocation (i.e. flower and seed counts) and genotypic analyses, which are used as an estimator of effective sexual reproduction across multiple generations. Genetic differentiation across sites was also modelled according to a hypothesis here defined as isolation-by-demography, in which we use population-specific factors, genotypic richness and eutrophication that are hypothesized to affect the source-sink dynamics and thus influence the genetic differentiation between a pair of populations. Eutrophic populations exhibited lower genotypic richness, in agreement with lower direct measurements of sexual allocation and contemporaneous gene flow. Genetic differentiation, while not explained by distance, was best predicted by genotypic richness and habitat quality. A multiple regression model using these two predictors was considered the best model (R(2) = 0.43). In this study, the relationship between environment and effective sexual-asexual balance is not simply (linearly) predicted by direct measurements of sexual allocation. Our results indicate that population-specific factors and the isolation-by-demography model should be used more often to understand genetic differentiation.

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  • Publisher Full Text
  • Authors+Show Affiliations

    ,

    Departament d'Ecologia, Universitat de Barcelona, Avda. Diagonal 643, 08028, Barcelona, Spain; Dipartimento di Scienze della Natura e del Territorio, Università degli Studi di Sassari, Via Piandanna 4, Sassari, 07100, Italy.

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    Source

    Molecular ecology 23:23 2014 Dec pg 5698-711

    MeSH

    Angiosperms
    Eutrophication
    Gene Flow
    Genetic Variation
    Genetics, Population
    Genotype
    Microsatellite Repeats
    Models, Genetic
    Reproduction
    Sequence Analysis, DNA
    Spain

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    25331192

    Citation

    TY - JOUR T1 - Reproductive strategies and isolation-by-demography in a marine clonal plant along an eutrophication gradient. AU - Oliva,Silvia, AU - Romero,Javier, AU - Pérez,Marta, AU - Manent,Pablo, AU - Mascaró,Oriol, AU - Serrão,Ester A, AU - Coelho,Nelson, AU - Alberto,Filipe, Y1 - 2014/11/15/ PY - 2013/6/12/received PY - 2014/10/9/revised PY - 2014/10/10/accepted PY - 2014/11/15/aheadofprint PY - 2014/10/22/entrez PY - 2014/10/22/pubmed PY - 2014/10/22/medline KW - clonality KW - eutrophication KW - genotypic richness KW - isolation-by-demography KW - seagrass reproductive strategies KW - seascape genetics SP - 5698 EP - 711 JF - Molecular ecology JO - Mol. Ecol. VL - 23 IS - 23 N2 - Genetic diversity in clonal organisms includes two distinct components, (i) the diversity of genotypes or clones (i.e. genotypic richness) in a population and (ii) that of the alleles (i.e. allelic and gene diversity within populations, and differentiation between populations). We investigated how population differentiation and genotypic components are associated across a gradient of eutrophication in a clonal marine plant. To that end, we combined direct measurements of sexual allocation (i.e. flower and seed counts) and genotypic analyses, which are used as an estimator of effective sexual reproduction across multiple generations. Genetic differentiation across sites was also modelled according to a hypothesis here defined as isolation-by-demography, in which we use population-specific factors, genotypic richness and eutrophication that are hypothesized to affect the source-sink dynamics and thus influence the genetic differentiation between a pair of populations. Eutrophic populations exhibited lower genotypic richness, in agreement with lower direct measurements of sexual allocation and contemporaneous gene flow. Genetic differentiation, while not explained by distance, was best predicted by genotypic richness and habitat quality. A multiple regression model using these two predictors was considered the best model (R(2) = 0.43). In this study, the relationship between environment and effective sexual-asexual balance is not simply (linearly) predicted by direct measurements of sexual allocation. Our results indicate that population-specific factors and the isolation-by-demography model should be used more often to understand genetic differentiation. SN - 1365-294X UR - https://www.unboundmedicine.com/medline/citation/25331192/Reproductive_strategies_and_isolation_by_demography_in_a_marine_clonal_plant_along_an_eutrophication_gradient_ L2 - http://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0962-1083&date=2014&volume=23&issue=23&spage=5698 ER -