Abstract
Devil’s gardens are a remarkable feature of Amazonian rainforests. These clearings result from the cultivation of ant-plants by their symbiotic ant, Myrmelachista schumanni. Each devil’s garden is inhabited by a single M. schumanni colony, often with millions of workers and thousands of queens. Through a combination of field surveys and microsatellite genotyping, we examined M. schumanni colony structure, mating system, dispersal, and phylogeography. We discovered that the reproduction of M. schumanni is weakly seasonal, exhibits facultative polyandry, and involves split sex ratios potentially leading to sex-biased dispersal. Surprisingly, we observed only very weak clustering of genetic variation, either within or between devil’s gardens. We hypothesize that the apparent absence of geographical structure results from the unusually high level of genetic differentiation between colonies. This study adds intriguing observations to the scarce literature about the reproduction and phylogeography of Amazonian ants.
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Acknowledgements
We thank the Dirección General Forestal y de Fauna Silvestre of the Ministerio de Agricultura in Peru for permits (Nos. 0299-2011-AG-DGFFS-DGEFFS, 0046-2014-MINAGRI-DGFFS-DGEFFS). We are grateful to A. Coral for assistance in the field. This work was supported by FQEB Grant RFP-12-06 from the National Philanthropic Trust to NEP and MEF, NSF SES-0750480 to NEP and the Natural Sciences and Engineering Research Council of Canada to MEF.
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Fig. S2
Population structure. Results of the clustering analyses conducted with STRUCTURE. Panel (a): Delta K plot according to STRUCTURE HARVESTER. The x-axis represents the different values of K tested (from 1 to 44), and the y-axis the Delta K value. Panel (b): assignment plot according to CLUMPP. Each vertical bar represents an individual from left to right in the same order as in Table 1, and the y-axis represents the percentage of assignment to clusters. Colors show the two clusters (PDF 12 kb)
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Malé, P.J.G., Youngerman, E., Pierce, N.E. et al. Mating system, population genetics, and phylogeography of the devil’s garden ant, Myrmelachista schumanni, in the Peruvian Amazon. Insect. Soc. 67, 113–125 (2020). https://doi.org/10.1007/s00040-019-00735-7
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DOI: https://doi.org/10.1007/s00040-019-00735-7