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- Title
Evolution in action: allopatry, variable diversity and a stepping-stone model of migration among populations of the freshwater bivalve <italic>Triplodon corrugatus</italic> from the north-eastern Amazon.
- Authors
da Cruz Santos-Neto, Guilherme; da Silva Nunes, Ismael Sander; Silva, Adam Rick Bessa; Tagliaro, Claudia Helena; Beasley, Colin Robert; Gomes, Cleidson Paiva
- Abstract
<italic>Triplodon corrugatus</italic> is a freshwater bivalve (Hyriidae) endemic to the Amazon, Orinoco and Tocantins basins, and the Piriá river. Our understanding of hyriid diversity at, and below, the species level, remains poor. The genetic diversity of <italic>T. corrugatus</italic> from the Tapajós, Amazon, Tocantins, Irituia and Piriá rivers in the north-eastern Brazilian Amazon was investigated. Except for the Irituia, where a single COII–COI haplotype had been fixed, all the other populations had medium to high haplotype diversities, and all populations had low nucleotide diversities. Pairwise fixation indices indicated that all populations were structured, except for comparisons between the Tapajós and Amazon, and the Amazon and Tocantins rivers, which may be explained by a stepping-stone model of migration. AMOVA detected that 81.28% of the variation was among populations. However, STRUCTURE analyses corroborated only the Piriá river specimens as comprising a distinct population, which is being maintained by allopatry due to the current isolation between the Piriá, and the Amazon and Tocantins basins.
- Subjects
AMAZON River Region; FRESHWATER mussels; POPULATION genetics; HYRIIDAE; BIODIVERSITY; HAPLOTYPES; VICARIANCE
- Publication
Hydrobiologia, 2018, Vol 810, Issue 1, p227
- ISSN
0018-8158
- Publication type
Academic Journal
- DOI
10.1007/s10750-017-3323-z