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    Author(s): Victoria L. Sork; Peter E. Smouse; Victoria J. Apsit; Rodney J. Dyer; Robert D. Westfall
    Date: 2005
    Source: American Journal of Botany 92(2):262-271
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (194 KB)


    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 (Nep) in clear-cut (Nep = 5.56) and selective-cut (Nep = 4.00) areas than in uncut areas (Nep = 2.87).

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    Sork, Victoria L.; Smouse, Peter E.; Apsit, Victoria J.; Dyer, Rodney J.; Westfall, Robert D. 2005. A two-generation analysis of pollen pool genetic structure in flowering dogwood Cornus florida (Cornaceae), in the Missouri Ozarks. American Journal of Botany 92(2):262-271


    California, Cornaceae, gene flow, genetic structure, landscape change, pollen movement, silvicultural treatment, TWOGENER

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