Abstract
Austrolebias wolterstorffi is a critically endangered annual fish, occurring in temporary ponds in a restricted area of Southern Brazil and Uruguay. Here, we evaluate the levels of genetic diversity and morphometric differentiation presented by A. wolterstorffi, attempting to reconstruct the spatiotemporal scenario by which this species reached their current distribution. Part of the mitochondrial cytochrome b and nuclear rhodopsin genes were characterized and analysed for a set of 122 and 110 specimens, respectively, collected along the entire distribution range of the species. Additionally, shape variations were evaluated for 92 individuals (43 males and 49 females) through geometric morphometric methods. Our analyses demonstrated several cases of significantly high levels of genetic differentiation among individual populations, in an isolation-by-distance pattern of divergence, with at least six different population groups along the Patos-Mirim lagoon. These groups differed by a minimum of 0.9% and a maximum of 2.6% of corrected cyt b nucleotide distances and did not share any mitochondrial haplotype. Such a pattern, added to the slight morphometric differentiation detected for most of the groups, suggests the occurrence of incipient speciation as consequence of allopatric fragmentation. The chronophylogenetic tree performed with the concatenated dataset supported independent oriental and occidental colonization routes, with the population located in the northwest part of the Rio Grande do Sul coastal plain presenting the most ancient divergence. In general, the recovered biogeographic patterns are highly consistent with the records of Quaternary climatic changes and depositional events that have occurred along the area inhabited by the studied species. This allowed us to establish a molecular clock calibration system for Neotropical annual fish. Thus, although the taxonomic status of each of the detected population units needs further study, it is clear that independent conservation strategies must be taken in each of the major areas covered by this study, most of which are located in Brazil.
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Acknowledgements
This study was funded by Fundação Grupo Boticário de Proteção à Natureza as part of the “Peixes Anuais do Pampa” and the “Padrões micro e macroevolutivos em peixes anuais de Cynopoecilus e Austrolebias (Cyprinodontiformes: Rivulidae) ao longo do Sistema de Drenagens Patos-Mirim: um enfoque comparativo com aplicações para a conservação – 1090_20171” projects. We thank CAPES and CNPq for providing fellowships to DKG and CB, respectively. All the collections were authorized by the Brazilian Ministério do Meio Ambiente (MMA), in the form of the Sistema de Autorização e Informação em Biodiversidade (SISBIO) (process number 55651-1). This study was also approved by the Ethics Comittee on Animal Use of the Universidade Federal do Rio Grande (process number 23116.008163/2015-23).
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Garcez, D.K., Barbosa, C., Loureiro, M. et al. Phylogeography of the critically endangered neotropical annual fish, Austrolebias wolterstorffi (Cyprinodontiformes: Aplocheilidae): genetic and morphometric evidence of a new species complex. Environ Biol Fish 101, 1503–1515 (2018). https://doi.org/10.1007/s10641-018-0795-2
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DOI: https://doi.org/10.1007/s10641-018-0795-2