Native bees mediate long-distance pollen dispersal in a shade coffee landscape mosaic
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Auteurs : Shalene Jha [États-Unis] ; Christopher W. Dick [États-Unis]Source :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2010.
Abstract
Coffee farms are often embedded within a mosaic of agriculture and forest fragments in the world's most biologically diverse tropical regions. Although shade coffee farms can potentially support native pollinator communities, the degree to which these pollinators facilitate gene flow for native trees is unknown. We examined the role of native bees as vectors of gene flow for a reproductively specialized native tree,
Url:
DOI: 10.1073/pnas.1002490107
PubMed: 20660738
PubMed Central: 2922262
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Christopher W. Dick<affiliation><nlm:aff id="aff4"><institution>Smithsonian Tropical Research Institute</institution>
, P.O. Box 0843-03092, Balboa Ancón,<country>Republic of Panama</country>
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<wicri:noCountry code="nlm country">Republic of Panama</wicri:noCountry>
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<front><div type="abstract" xml:lang="en"><p>Coffee farms are often embedded within a mosaic of agriculture and forest fragments in the world's most biologically diverse tropical regions. Although shade coffee farms can potentially support native pollinator communities, the degree to which these pollinators facilitate gene flow for native trees is unknown. We examined the role of native bees as vectors of gene flow for a reproductively specialized native tree, <italic>Miconia affinis</italic>
, in a shade coffee and remnant forest landscape mosaic. We demonstrate extensive cross-habitat gene flow by native bees, with pollination events spanning more than 1,800 m. Pollen was carried twice as far within shade coffee habitat as in nearby forest, and trees growing within shade coffee farms received pollen from a far greater number of sires than trees within remnant forest. The study shows that shade coffee habitats support specialized native pollinators that enhance the fecundity and genetic diversity of remnant native trees.</p>
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