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Morphometric variation in allopatric populations of Aegla platensis (Crustacea: Decapoda: Anomura): possible evidence for cryptic speciation

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Abstract

Aegla platensis is a freshwater crustacean species that forms a nonmonophyletic group, which may indicate that the taxon is composed of cryptic species. Our objective was to test if allopatric populations of A. platensis differ in carapace shape, aiming to clarify the species situation. We used a geometric morphometric approach to analyze the carapace shape of 11 populations of A. platensis, four from Argentina and seven from Brazil. Our results showed that all the populations differ significantly in carapace shape, except two populations from Argentina and two from Brazil. The Argentinean and Brazilian populations formed two separate groups and were separated by high values of shape distance. This suggests the existence of reproductive isolation between the populations from the two groups. Shape distances between populations within each country were lower. Allopatric populations of A. platensis may be isolated from each other by the difficulty of migration, leading to interruption of gene flow and differentiation in carapace shape.

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Acknowledgments

The authors are grateful to the Fundación Miguel Lillo, in the person of Marcela Peralta, for the samples of Aegla platensis. To Dr. Michel Baylac for the Rmorph package. To Alberto Senra Gonçalves for the help with figures and comments on the manuscript. To Marcelo Marchet Dalosto for the help with translations and comments on the manuscript. To CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for the scholarship and the productivity grant to SS, and to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the master’s degree scholarship to ABM.

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Authors and Affiliations

  1. Programa de Pós-Graduação em Biodiversidade Animal, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria (UFSM), Roraima Avenue, 1000, Camobi, Santa Maria, Rio Grande do Sul, 97105-900, Brazil

    Amanda B. Marchiori & Sandro Santos

  2. Laboratório de Ecomorfologia Animal, Programa de Pós-Graduação em Ecologia, Departamento de Ciências Biológicas, Universidade Regional Integrada do Alto Uruguai e das Missões (URI), Campus Erechim, Sete de Setembro Street, 1621, Erechim, 99700-000, Brazil

    Rodrigo Fornel

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  1. Amanda B. Marchiori
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  2. Rodrigo Fornel
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Correspondence to Sandro Santos.

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Communicated by Andreas Schmidt-Rhaesa.

Appendix

Appendix

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Table 2 Result of the pairwise MANOVA for populations of Aegla platensis, with Bonferroni correction to adjustment of p value
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Marchiori, A.B., Fornel, R. & Santos, S. Morphometric variation in allopatric populations of Aegla platensis (Crustacea: Decapoda: Anomura): possible evidence for cryptic speciation. Zoomorphology 134, 45–53 (2015). https://doi.org/10.1007/s00435-014-0242-7

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