A two-generation analysis of pollen pool genetic structure in flowering dogwood, Cornus florida (Cornaceae), in the Missouri Ozarks

Victoria L. Sork, Peter E. Smouse, Victoria J. Apsit, Rodney J. Dyer, Robert D. Westfall

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42 Scopus citations


Anthropogenic landscape change can disrupt gene flow. As part of the Missouri Ozark Forest Ecosystem Project, this study examined whether silvicultural practices influence pollen-mediated gene movement in the insect-pollinated species, Cornus florida L., by comparing pollen pool structure (Φst) among clear-cutting, selective cutting, and uncut regimes with the expectation that pollen movement should be least in the uncut regime. Using a sample of 1500 seedlings - 10 each from 150 seed parents (43 in clear-cut, 74 in selective, and 33 in control sites) from six sites (each ranging from 266 to 527 ha), eight allozyme loci were analyzed with a pollen pool structure approach known as TWOGENER (Smouse et al., 2001; Evolution 55: 260-271). This analysis revealed that pollen pool structure was less in clear-cut (ΦC = 0.090, P < 0.001) than in uncut areas (ΦU = 0.174, P < 0.001), with selective-cut intermediate (ΦS = 0.125, P < 0.001). These estimates translate into more effective pollen donors (Ncp) in clear-cut (Ncp = 5.56) and selective-cut (Ncp = 4.00) areas than in uncut areas (N cp = 2.87). We demonstrate that ΦC ≤ ΦS ≤ ΦU, with ΦC significantly smaller than ΦU (P < 0.034). The findings imply that, as long as a sufficiently large number of seed parents remain to provide adequate reproduction and to avoid a genetic bottleneck in the effective number of mothers, silvicultural management may not negatively affect the effective number of pollen parents, and hence subsequent genetic diversity in Cornus florida.

Original languageEnglish (US)
Pages (from-to)262-271
Number of pages10
JournalAmerican Journal of Botany
Issue number2
StatePublished - Feb 2005

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science


  • California
  • Cornaceae
  • Gene flow
  • Genetic structure
  • Landscape change
  • Pollen movement
  • Silvicultural treatment

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