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

被引:44
作者
Sork, VL
Smouse, PE
Apsit, VJ
Dyer, RJ
Westfall, RD
机构
[1] Univ Calif Los Angeles, Dept Ecol & Evolut Biol, Los Angeles, CA 90095 USA
[2] Rutgers State Univ, Dept Ecol Evolut & Nat Resources, New Brunswick, NJ 08901 USA
[3] Boston Univ, Coll Gen Studies, Boston, MA 02215 USA
[4] Virginia Commonwealth Univ, Dept Biol, Richmond, VA 23284 USA
[5] USDA, Forest Serv, Sierra Nevada Res Ctr, Pacific SW Res Stn, Berkeley, CA 94701 USA
关键词
California; Cornaceae; gene flown; genetic structure; landscape change; pollen movement; silvicultural treatment; TwoGENER;
D O I
10.3732/ajb.92.2.262
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 (Phi(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 ((Phi) over circle (C) = 0.090, P < 0.001) than in uncut areas ((Phi) over cap (U) = 0.174, P < 0.001), with selective-cut intermediate ((Phi) over circles = 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 Phi(C) less than or equal to Phi(S) less than or equal to Phi(U), with (Phi) over circle (C), significantly smaller than (Phi) over circle (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.
引用
收藏
页码:262 / 271
页数:10
相关论文
共 51 条
[1]  
ALVAREZBUYLLA ER, 1994, EVOLUTION, V48, P437, DOI 10.1111/j.1558-5646.1994.tb01322.x
[2]  
APSIT VJ, 2002, P 2 MISS OZ FOR EC S, P213
[3]  
Austerlitz F, 2002, GENETICS, V161, P355
[4]   Two-generation analysis of pollen flow across a landscape. III. Impact of adult population structure [J].
Austerlitz, F ;
Smouse, PE .
GENETICS RESEARCH, 2001, 78 (03) :271-280
[5]  
Austerlitz F, 2001, GENETICS, V157, P851
[6]  
BAILEY KJ, 2002, THESIS U MISSOURI ST
[7]  
Brookshire B., 1993, P 9 CENTRAL HARDWOOD, P289
[8]  
Brookshire B.L., 1997, P MISS OZ FOR EC PRO
[9]  
Brookshire BL, 1997, US FOR SERV T R NC, V193, P1
[10]  
Carey A. B., 1999, Journal of Sustainable Forestry, V9, P83, DOI 10.1300/J091v09n03_05