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Evolution. 2019 Jul 24. doi: 10.1111/evo.13809. [Epub ahead of print]

Inferring processes of coevolutionary diversification in a community of Panamanian strangler figs and associated pollinating wasps.

Author information

1
Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, Iowa, 50011.
2
Smithsonian Tropical Research Institute, Unit 9100, P.O. Box 0498, Diplomatic Post Office, Armed Forces America, 34002-9998.
3
Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 752 36, Uppsala, Sweden.
4
Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, New York, 10027.
5
Department of Biology, University of Maryland, College Park, Maryland, 20742.

Abstract

The fig and pollinator wasp obligate mutualism is diverse (∼750 described species), ecologically important, and ancient (∼80 Ma). Once thought to be an example of strict one-to-one cospeciation, current thinking suggests genera of pollinator wasps codiversify with corresponding sections of figs, but the degree to which cospeciation or other processes contribute to the association at finer scales is unclear. Here, we use genome-wide sequence data from a community of Panamanian strangler figs and associated wasp pollinators to estimate the relative contributions of four evolutionary processes generating cophylogenetic patterns in this mutualism: cospeciation, host switching, pollinator speciation, and pollinator extinction. Using a model-based approach adapted from the study of gene family evolution, our results demonstrate the importance of host switching of pollinator wasps at this fine phylogenetic and regional scale. Although we estimate a modest amount of cospeciation, simulations reveal the number of putative cospeciation events to be consistent with what would be expected by chance. Additionally, model selection tests identify host switching as a critical parameter for explaining cophylogenetic patterns in this system. Our study demonstrates a promising approach through which the history of evolutionary association between interacting lineages can be rigorously modeled and tested in a probabilistic phylogenetic framework.

KEYWORDS:

Ficus; Pegoscapus; RADseq; host switching; obligate mutualism; ultraconserved elements

PMID:
31339553
DOI:
10.1111/evo.13809

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