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Effects of Environmental Variation in Structuring Population Genetic Variation in the False-Water Cobras (Xenodontinae: Hydrodynastes)

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Abstract

Although rivers are known to promote diversification and shape phylogeographic patterns, they can also be permeable and facilitate the dispersal of species. Using multiple molecular methodological approaches, we conducted a phylogeographic investigation of two semiaquatic snake species with continental distributions across South America, testing how environmental and historical factors (e.g., potential allopatric divergence across rivers) have affected their evolutionary history. Our results show that Hydrodynastes gigas and H. bicinctus have a recent divergence time (~1.5 mya) and that both species have low genetic diversity with no geographic structure. Population genetic divergence in H. gigas is explained by geographic distance (isolation-by-distance), climate (isolation-by-environment), and hydrographic basin. Paleo-niche models suggest that historically stable regions of habitat suitability for both taxa are largely restricted to the La Plata basin. We suggest that life history traits of these species, for example high dispersal capabilities and generalist ecologies, have allowed for their extensive geographic distributions and population connectivity resulting in no geographic structure and low genetic variation.

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The datasets analysed during the current study are referenced in the text and publicly available.

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Acknowledgements

We are grateful to Antoine Fouquet, Mael Dewynter, Adrian Garda, Guarino Coli, Miguel Rodrigues, Felipe Curcio, Fernanda Werneck, Camila Ribas, Francisco Franco, Felipe Grazziotin, Rafael Benetti, Matheus Neves, Elvis Almeida and Hugo Cabral for providing tissues samples. We are grateful to Diego Baldo, Carla Bessa and Vanessa Arzamendia for provindig sequences. PSC thanks Jaqueline Battilana, Sarah Mângia and Ricardo Koroiva for their help with the techniques in the molecular laboratory, Sarah Mângia and Eliana Oliveira for their help in editing the sequences.

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Contributions

PSC, DS, EAM, conceived the ideas, formal analysis; PSC, DS and HZ, data acquisition; PSC, data curation; and PSC led the writing with assistance from EAM, DS and HZ.

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Correspondence to Priscila S. Carvalho.

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The authors have no conflicts of interest.

Supplementary Information

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11692_2023_9601_MOESM1_ESM.pdf

Supplementary file1 (PDF 3409 kb)—Fig. S1 Bayesian gene genealogies Cytb; 16S; Cmos; NT3. Numbers above/below branches are posterior probability (PP) values. Scale bar indicates substitutions per site.

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Carvalho, P.S., Santana, D.J., Zaher, H. et al. Effects of Environmental Variation in Structuring Population Genetic Variation in the False-Water Cobras (Xenodontinae: Hydrodynastes). Evol Biol 50, 224–238 (2023). https://doi.org/10.1007/s11692-023-09601-8

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  • DOI: https://doi.org/10.1007/s11692-023-09601-8

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