Abstract
The saddled blenny Malacoctenus triangulatus is a widely distributed species of cryptobenthic reef fish that occurs from the Caribbean to southeastern Brazil, including the oceanic islands. Subtle morphological differences have been observed between populations, suggesting some degree of structuring along its distribution, especially between insular and coastal environments. In this study, we conducted phylogeographic analyses of M. triangulatus based on mitochondrial (cytochrome oxidase I and cytochrome b) and nuclear (rhodopsin) genes, including sequences of M. brunoi, a closely related species endemic to the oceanic islands of southeastern Brazil. Three highly structured lineages were identified within the M. triangulatus complex: one restricted to the Caribbean province probably isolated by the Amazon barrier, and two in the Brazilian province, one in the northeastern oceanic islands (NOI) and another along the coast (including M. brunoi). This result indicates that divergent evolutionary processes have driven the evolution of the saddled benny in the Tropical Southwestern Atlantic: an ancient isolation of the NOI lineage during the Neogene and a recent ecological speciation event in the southeastern oceanic islands, which were connected to the coast during Pleistocene marine regressions. Together, these results provide insights on the evolutionary patterns and oceanographic barriers in the Western Tropical Atlantic.
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Acknowledgements
We are grateful to F. Petean, N. Dias, G. Araújo, F. Pupo, T. Leite, F. Lima, and A. Almeida for help during field collections, to R. Noguchi and SISBIOTA–MAR for donating material to the MNRJ fish collection, to M. Gehara for help with analysis, to A. Carvalho Filho and F. Lima for the photos, and to Abudefduf Atividades Subaquáticas and DeepTrip for logistical support during fieldwork. This paper is part of the PhD Thesis of Ricardo Marques Dias at the Biodiversity and Evolutionary Biology Graduate Program at the Federal University of Rio de Janeiro (PPGBBE/UFRJ); RMD is supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Grant Number 132124/2013-0 and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) Grant Number 2346/2011. PCP is supported by CNPq Grant Number 304321/2017-6. MRB is supported by CNPq Grant Number 305955/2015-2 and also a Grant from “Edital Programa Institucional de Pesquisa nos Acervos da USP.”
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Supplementary material 1 (DOC 379 kb) Online Resource 1. List of specimens analyzed in this study, including species, biogeographic provinces, major clades recovered in phylogeny analysis, sampling site, geographic coordinates, and sequence accession number. Sequences obtained from GenBank are marked with an * and from BoldSystem with an **
10750_2019_3966_MOESM2_ESM.doc
Supplementary material 2 (DOC 51 kb) Online Resource 2. Molecular parameters of the Malacoctenus triangulatus species complex in the Brazilian provinces for mtDNA (COI and Cytb) and nuDNA (Rho). Parameters include total number of individuals analyzed in each location (N), number of haplotypes (H), number of polymorphic sites (S), haplotype diversity (h), and nucleotide diversity (π)
10750_2019_3966_MOESM3_ESM.doc
Supplementary material 3 (DOC 71 kb) Online Resource 3. Matrix of pairwise genetic distances (p-distance) for cytochrome c oxidase subunit I (COI, A), cytochrome b (Cytb, B), and rhodopsin (Rho, C) sequences of Malacoctenus. N = number of samples
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Dias, R.M., Lima, S.M.Q., Mendes, L.F. et al. Different speciation processes in a cryptobenthic reef fish from the Western Tropical Atlantic. Hydrobiologia 837, 133–147 (2019). https://doi.org/10.1007/s10750-019-3966-z
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DOI: https://doi.org/10.1007/s10750-019-3966-z