Thompson, Kim , Culley, Theresa , Lentz, David .
Genetic Diversity and Structure of a Tropical Fruit, Timber and Latex Tree, Manilkara zapota (Sapotaceae).
Manilkara zapota (L.) P. Royen is a tropical fruit, timber and latex tree in the Sapotaceae family. M. zapota trees have long been protected by the Maya in its native region of Mexico and Central America and continue to be valued as an ecological, economic and scientific resource. The goals of this project were to (1) quantify levels of genetic variation in M. zapota from the Peten region of Guatemala,and (2) describe how that genetic variation is structured among populations from diverse habitat types and histories. Levels of genetic diversity were analyzed within and among populations from ancient Maya sites and indigenous Maya home gardens using microsatellites. We expected that deforestation by the Maya would have led to (1) reduced levels of variation in microsatellites, compared to neotropical trees from non-Maya areas, and (2) genetic structuring, (theta greater than 0) due to reduced gene flow between populations. Our results suggest instead that M. zapota populations in Maya developed forests contain high levels of polymorphism with low levels of genetic structuring. Together, nuclear and chloroplast microsatellite analysis will enable us to distinguish the contributions of natural patterns of gene flow from anthropogenic events. Reduced polymorphism and increased population genetic structure in home gardens indicate that management or fragmentation is influencing the genetic composition of M.zapota. Characterizing the variation and structure of M. zapota will elucidate patterns of gene flow in neotropical forests, benefit studies of ancient Maya agroforestry practices, and support tropical forest conservation efforts.
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1 - University Of Cincinnati, Biological Sciences, Rieveschl Hall, Cincinnati, OH, 45221-0006, USA
2 - University Of Cincinnati, Department Of Biological Sciences, 614 Rieveschl Hall, Cincinnati, OH, 45221-0006, USA
3 - University Of Cincinnati, Biological Sciences, PO Box 210006, Cincinnati, OH, 45221, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Portland Room/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 11:30 AM