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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multifactorial genetic divergence processes drive the onset of speciation in an Amazonian fish

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Author(s):
de Queiroz, Luiz Jardim [1] ; Torrente-Vilara, Gislene [2] ; Quilodran, Claudio [3, 1] ; da Costa Doria, Carolina Rodrigues [4] ; Montoya-Burgos, Juan I. [3, 1]
Total Authors: 5
Affiliation:
[1] Univ Geneva, Dept Genet & Evolut, Geneva - Switzerland
[2] Univ Fed Sao Paulo, Dept Marine Sci, Campus Baixada Santista, Santos, SP - Brazil
[3] Univ Geneva, Inst Genet & Genom Geneva iGE3, Geneva - Switzerland
[4] Univ Fed Rondonia, Dept Biol, Porto Velho, RO - Brazil
Total Affiliations: 4
Document type: Journal article
Source: PLoS One; v. 12, n. 12 DEC 20 2017.
Web of Science Citations: 0
Abstract

Understanding the processes that drive population genetic divergence in the Amazon is challenging because of the vast scale, the environmental richness and the outstanding bio-diversity of the region. We addressed this issue by determining the genetic structure of the widespread Amazonian common sardine fish Triportheus albus (Characidae). We then examined the influence, on this species, of all previously proposed population-structuring factors, including isolation-by-distance, isolation-by-barrier (the Teotonio Falls) and isolation-by-environment using variables that describe floodplain and water characteristics. The population genetics analyses revealed an unusually strong structure with three geographical groups: Negro/Tapajos rivers, Lower Madeira/Central Amazon, and Upper Madeira. Distance-based redundancy analyses showed that the optimal model for explaining the extreme genetic structure contains all proposed structuring factors and accounts for up to 70% of the genetic structure. We further quantified the contribution of each factor via a variance-partitioning analysis. Our results demonstrate that multiple factors, often proposed as individual drivers of population divergence, have acted in conjunction to divide T. albus into three genetic lineages. Because the conjunction of multiple long-standing population-structuring processes may lead to population reproductive isolation, that is, the onset of speciation, we suggest that the multifactorial population-structuring processes highlighted in this study could account for the high speciation rate characterising the Amazon Basin. (AU)

FAPESP's process: 16/07910-0 - Javari River basin in the context of "Amazon fish and climate changes - AMAZONFISH"
Grantee:Gislene Torrente Vilara
Support Opportunities: Regular Research Grants