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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.)

hylogeography of Baryancistrus xanthellus (Siluriformes: Loricariidae), a rheophilic catfish endemic to the Xingu River basin in eastern Amazoni

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Author(s):
Magalhaes, Keila Xavier [1] ; Figueiredo da Silva, Raimundo Darley [2] ; Sawakuchi, Andre Oliveira [3] ; Goncalves, Alany Pedrosa [4] ; Evangelista Gomes, Grazielle Fernanda [2] ; Muriel-Cunha, Janice [5] ; Sabaj, Mark H. [6] ; de Sousa, Leandro Melo [1]
Total Authors: 8
Affiliation:
[1] Univ Fed Para, Lab Ictiol Altamira, Altamira, Para - Brazil
[2] Univ Fed Para, Inst Estudos Costeiros, Lab Genet Aplicada, Braganca, Para - Brazil
[3] Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP - Brazil
[4] Inst Nacl de Pesquisas da Amazonia, Programa Posgrad Biol Agua Doce & Pesca Interior, INPA, Manaus, Amazonas - Brazil
[5] Univ Fed Para, Inst Estudos Costeiros, Campus Braganca, Braganca, Para - Brazil
[6] Drexel Univ, Acad Nat Sci, Dept Ichthyol, Philadelphia, PA 19104 - USA
Total Affiliations: 6
Document type: Journal article
Source: PLoS One; v. 16, n. 8 AUG 27 2021.
Web of Science Citations: 0
Abstract

Baryancistrus xanthellus (Loricariidae) is an endemic fish species from the Xingu River basin with its life history in the shallow rapid waters flowing over bedrock substrates. In order to investigate the genetic diversity and demographic history of B. xanthellus we analyzed sequence data for one mitochondrial gene (Cyt b) and introns 1 and 5 of nuclear genes Prolactin (Prl) and Ribosomal Protein L3 (RPL3). The analyses contain 358 specimens of B. xanthellus from 39 localities distributed throughout its range. The number of genetically diverged groups was estimated using Bayesian inference on Cyt b haplotypes. Haplotype networks, AMOVA and pairwise fixation index was used to evaluate population structure and gene flow. Historical demography was inferred through neutrality tests and the Extended Bayesian Skyline Plot (EBSP) method. Five longitudinally distributed Cyt b haplogroups for B. xanthellus were identified in the Xingu River and its major tributaries, the Bacaja ` and Iriri. The demographic analysis suggests that rapids habitats have expanded in the Iriri and Lower Xingu rivers since 200 ka (thousand years) ago. This expansion is possibly related to an increase in water discharge as a consequence of higher rainfall across eastern Amazonia. Conversely, this climate shift also would have promoted zones of sediment trapping and reduction of rocky habitats in the Xingu River channel upstream of the Iriri River mouth. Populations of B. xanthellus showed strong genetic structure along the freeflowing river channels of the Xingu and its major tributaries, the Bacaja' and Iriri. The recent impoundment of the Middle Xingu channel for the Belo Monte hydroelectric dam may isolate populations at the downstream limit of the species distribution. Therefore, future conservation plans must consider the genetic diversity of B. xanthellus throughout its range. (AU)

FAPESP's process: 12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach
Grantee:Lúcia Garcez Lohmann
Support Opportunities: BIOTA-FAPESP Program - Thematic Grants