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    Patterns of Genetic Variation in Southern Appalachian Populations of Athyrium filix‐femina var. asplenioides (Dryopteridaceae)

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    Issue Date
    2005-09-01
    Author
    Sciarretta, Kimberly L.
    Arbuckle, Erin Potter
    Haufler, Christopher H.
    Werth, Charles R.
    Publisher
    University of Chicago Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Allozyme variation (17 loci coding 11 enzymes) was investigated in 14 populations of the fern Athyrium filix‐femina var. asplenioides arrayed at differing elevations and latitudes in the southern Appalachians. Allozyme fingerprints showed that asplenioides individuals comprise meandering, overlapping clones usually ≤3 m in extent, occasionally forming larger clones of up to 17 m. Levels of genetic variability in populations (means: , , ) were near the averages for both ferns and seed plants. General conformance to Hardy‐Weinberg expectations indicated a predominantly outcrossing mating system. Hierarchical F statistic analysis and occasional deficits and excesses of heterozygotes indicated population substructure. Similar allele frequencies across all populations resulted in low to moderate values (mean ; ) and high values of genetic similarity (mean ; mean ). Hierarchical analysis indicated that neither regional proximity ( ) nor elevation ( ) contributed substantially to divergence among populations ( ), a result corroborated by UPGMA analysis that clustered together populations from different regions and of different elevational class. Southern Appalachian asplenioides differed from more eastern asplenioides populations of the piedmont and coastal plain in having higher frequencies of Pgm‐2c and Tpi‐2B, alleles characteristic of the more northern variety angustum. Nonetheless, genetic distinctness of the two varieties was maintained. We hypothesize that higher frequencies of angustum alleles in the southern Appalachian asplenioides populations are the result of introgression from angustum that persisted at high elevations as both taxa migrated northward following the retreat of the Wisconsinan glacier.
    URI
    http://hdl.handle.net/1808/16494
    DOI
    https://doi.org/10.1086/432154
    ISSN
    1058-5893
    Collections
    • Center for Teaching Excellence Scholarly Works [83]
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Sciarretta, Kimberly L.; Arbuckle, Erin Potter; Haufler, Christopher H.; Werth, Charles R. (2005). "Patterns of Genetic Variation in Southern Appalachian Populations of Athyrium filix‐femina var. asplenioides (Dryopteridaceae)." International Journal of Plant Science, 166(5):761-780. http://www.dx.doi.org/10.1086/432154

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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