期刊
MOLECULAR ECOLOGY
卷 27, 期 15, 页码 3159-3173出版社
WILEY
DOI: 10.1111/mec.14768
关键词
alpha; beta and gamma allelic diversity; Arecaceae; frugivore foraging ecology; pollen flow; seed dispersal; spatial genetic structure
资金
- National Science Foundation USA [1501514, 1548548]
- Conservation, Food and Health Foundation
- Tulane University
- United States Fish & Wildlife Service [5605]
- National Geographic Society
- Disney Conservation Fund
Seed and pollen dispersal shape patterns of gene flow and genetic diversity in plants. Pollen is generally thought to travel longer distances than seeds, but seeds determine the ultimate location of gametes. Resolving how interactions between these two dispersal processes shape microevolutionary processes is a long-standing research priority. We unambiguously isolated the separate and combined contributions of these two dispersal processes in seedlings of the animal-dispersed palm Oenocarpus bataua to address two questions. First, what is the spatial extent of pollen versus seed movement in a system characterized by long-distance seed dispersal? Second, how does seed dispersal mediate seedling genetic diversity? Despite evidence of frequent long-distance seed dispersal, we found that pollen moves much further than seeds. Nonetheless, seed dispersal ultimately mediates genetic diversity and fine-scale spatial genetic structure. Compared to undispersed seedlings, seedlings dispersed by vertebrates were characterized by higher female gametic and diploid seedling diversity and weaker fine-scale spatial genetic structure for female gametes, male gametes and diploid seedlings. Interestingly, the diversity of maternal seed sources at seed deposition sites (N-em) was associated with higher effective number of pollen sources (N-ep), higher effective number of parents (N-e) and weaker spatial genetic structure, whereas seed dispersal distance had little impact on these or other parameters we measured. These findings highlight the importance maternal seed source diversity (N-em) at frugivore seed deposition sites in driving emergent patterns of fine-scale genetic diversity and structure.
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