Pacific Southwest Research Station

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

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

Date: 2005

Source: American Journal of Botany 92(2):262-271

Description: 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 (Φ_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 (Φ_C = 0.090, P < 0.001) than in uncut areas (Φ_U = 0.174, P < 0.001), with selective-cut intermediate (Φ_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).

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

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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.