| Full text | |
| Author(s): |
Buranelli, Raquel C.
;
Mantelatto, Fernando L.
Total Authors: 2
|
| Document type: | Journal article |
| Source: | CRUSTACEANA; v. 90, n. 7-10, p. 845-864, 2017. |
| Web of Science Citations: | 1 |
| Abstract | |
Population genetic studies on marine taxa, specifically in the field of phylogeography, have revealed distinct levels of genetic differentiation in widely distributed species, even though they present long planktonic larval development. A set of factors have been identified as acting on gene flow between marine populations, including physical or physiological barriers, isolation by distance, larval behaviour, and geological and demographic events. In this way, the aim of this study was to analyse the genetic variability among populations of the crab species Sesarma rectum Randall, 1840 along the western Atlantic in order to check the levels of genetic diversity and differentiation among populations. To achieve this purpose, mtDNA cytochrome-c oxidase subunit I (COI) (DNAbarcode marker) data were used to compute a haplotype network and a Bayesian analysis for genetic differentiation, to calculate an Analysis of Molecular Variance (AMOVA), and haplotype and nucleotide diversities. Neutrality tests (Tajima's D and Fu's Fs) were accessed, as well as pairwise mismatch distribution under the sudden expansion model. We found sharing of haplotypes among populations of S. rectum along its range of distribution and no significant indication for restricted gene flow between populations separately over 6000 km, supporting the hypothesis of a high dispersive capacity, and/ or the absence of strong selective gradients along the distribution. Nevertheless, some results indicated population structure suggesting the presence of two genetic sources (i. e., groups or lineages), probably interpreted as a result of a very recent bottleneck effect due to habitat losses, followed by the beginning of a population expansion. (AU) | |
| FAPESP's process: | 09/54931-0 - Improvement and management of biological specimen collections at the Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo |
| Grantee: | Carlos Alberto Garofalo |
| Support type: | Research Infrastructure Program - Biological specimen collections |
| FAPESP's process: | 10/50188-8 - Decapod crustaceans: multi-disciplinary characterization of the sea biodiversity of the State of São Paulo (taxonomy, spermiotaxonomy, molecular biology and population dynamics) |
| Grantee: | Fernando Luis Medina Mantelatto |
| Support type: | BIOTA-FAPESP Program - Thematic Grants |
| FAPESP's process: | 12/06299-5 - Populational variability among decapod crustacean species from mangroves: morphological and molecular analysis |
| Grantee: | Raquel Correa Buranelli |
| Support type: | Scholarships in Brazil - Doctorate (Direct) |