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Hidden founders? Strong bottlenecks and fine-scale genetic structure in mangrove populations of the Cameroon Estuary complex

  • MANGROVES IN CHANGING ENVIRONMENTS
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Abstract

Fine-scale genetic structure (FSGS) is common in plants, driven by several ecological and evolutionary processes, among which is gene flow. Mangrove trees rely on ocean surface currents to spread their hydrochorous propagules through space. Since pollen dispersal is generally restricted to local scales, high level of short-distance propagule dispersal is expected to result in FSGS in Rhizophora spp. We investigated FSGS, recent bottleneck events, as well as historical and contemporary expansion patterns in Rhizophora racemosa populations from the entire coast of Cameroon, using 11 polymorphic microsatellite markers. Populations of the Cameroon Estuary complex (CEC) showed significant FSGS and significant reduction in effective population sizes (recent bottlenecks), compared to the other areas. Additionally, our results indicate stark differences between historical and contemporary expansion models. These suggest that contemporary processes such as restricted propagule dispersal, bottleneck events from high indirect and direct anthropogenic pressure, and recolonization by founders from ancient local pockets/refugia most plausibly shape the patterns of FSGS in the CEC.

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Acknowledgements

This study was funded by the Vrije Universiteit Brussel—International Relations and Mobility Office (VUB—IRMO) Doctoral Scholarship awarded to Magdalene N. Ngeve. The modelling component of this study was done at the Jet Propulsion Laboratory (JPL), California Institute of Technology (during a JPL Visiting Student Researchers Program (JVSRP)), under a contract with the National Aeronautics and Space Administration (NASA). High-end computing resources were provided by the NASA Advanced Supercomputing (NAS) Division of the Ames Research Center.

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Correspondence to Magdalene N. Ngeve.

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Guest editors: K. W. Krauss, I. C. Feller, D. A. Friess, & R. R. Lewis III / Causes and Consequences of Mangrove Ecosystem Responses to an Ever-Changing Climate

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Ngeve, M.N., Van der Stocken, T., Menemenlis, D. et al. Hidden founders? Strong bottlenecks and fine-scale genetic structure in mangrove populations of the Cameroon Estuary complex. Hydrobiologia 803, 189–207 (2017). https://doi.org/10.1007/s10750-017-3369-y

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