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Pollinator type strongly impacts gene flow within and among plant populations for six Neotropical species
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Pollinator type strongly impacts gene flow within and among plant populations for six Neotropical species
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Journal Article
Pollinator type strongly impacts gene flow within and among plant populations for six Neotropical species
2023
Overview
Animal pollinators directly affect plant gene flow by transferring pollen grains between individuals. Pollinators with restricted mobility are predicted to limit gene flow within and among populations, whereas pollinators that fly longer distances are likely to promote genetic cohesion. These predictions, however, remain poorly tested. We examined population genetic structure and fine-scale spatial genetic structure (FSGS) in six perennial understory angiosperms in Andean cloud forests of northwestern Ecuador. Species belong to three families (Gesneriaceae, Melastomataceae, and Rubiaceae), and within each family we paired one insect-pollinated with one hummingbird-pollinated species, predicting that insect-pollinated species have greater population differentiation (as quantified with the F
ST statistic) and stronger FSGS (as quantified with the S
P statistic) than hummingbird-pollinated species. We confirmed putative pollinators through a literature review and fieldwork, and inferred population genetic parameters with a genome-wide genotyping approach. In two of the three species pairs, insect-pollinated species had much greater (>2-fold) population-level genetic differentiation and correspondingly steeper declines in fine-scale genetic relatedness. In the Gesneriaceae pair, however, F
ST and S
P values were similar between species and to those of the other hummingbird-pollinated plants. In this pair, the insect pollinators are euglossine bees (as opposed to small bees and flies in the other pairs), which are thought to forage over large areas, and therefore may provide similar levels of gene flow as hummingbirds. Overall, our results shed light on how different animal pollination modes influence the spatial scale of plant gene flow, suggesting that small insects strongly decrease genetic cohesion.
Publisher
John Wiley and Sons, Inc,John Wiley & Sons, Inc,Ecological Society of America
Subject
