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A two-generation analysis of pollen pool genetic structure in flowering dogwood, Cornus florida (Cornaceae), in the Missouri Ozarks¹

²Department of Ecology & Evolutionary Biology, University of California at Los Angeles, Box 951606, Los Angeles, California 90095-1606 USA; ³Department of Ecology, Evolution & Natural Resources, Rutgers University, New Brunswick, New Jersey 08901-8551 USA; ⁴College of General Studies, Boston University, Boston, Massachusetts 02215 USA; ⁵Department of Biology, Virginia Commonwealth University, Richmond, Virginia 23284-2012 USA; ⁶Sierra Nevada Research Center, USDA Forest Service, Pacific Southwest Research Station, P.O. Box 245, Berkeley, California 94701 USA

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 (_st) 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 (_C = 0.090, P < 0.001) than in uncut areas (_U = 0.174, P < 0.001), with selective-cut intermediate (_S = 0.125, P < 0.001). These estimates translate into more effective pollen donors (N_ep) in clear-cut (N_ep = 5.56) and selective-cut (N_ep = 4.00) areas than in uncut areas (N_ep = 2.87). We demonstrate that _{C S U}, with _C significantly smaller than _U (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.

Key Words: California • Cornaceae • gene flow • genetic structure • landscape change • pollen movement • silvicultural treatment • TwoGener

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