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RESEARCH ARTICLE

Phylogeographical patterns of Cnesterodon decemmaculatus populations at different geographic scales in Buenos Aires province: possible implications for its use as a bioindicator species

María Soledad Byrne https://orcid.org/0000-0001-9872-0740 A B D , Patricia Mercedes Bianco A B , Liria Belén Campos B C , Natalia Alejandra Ossana B C , Lucrecia Ferrari B C and Juan Ignacio Túnez A B
+ Author Affiliations
- Author Affiliations

A Grupo de Investigación en Ecología Molecular (GIEM), Departamento de Ciencias Básicas, Universidad Nacional de Lujan, Ruta 5 y Avenida Constitución, s/n PO Box 221, B6700ZBA, Lujan, Buenos Aires, Argentina.

B Instituto de Ecología y Desarrollo Sustentable (INEDES-UNLu-CONICET), Universidad Nacional de Luján, Ruta 5 y Avenida Constitución, s/n, PO Box 221, B6700ZBA, Lujan, Buenos Aires, Argentina.

C Programa de Ecofisiología Aplicada (PRODEA), Departamento de Ciencias Básicas, Universidad Nacional de Lujan, Ruta 5 y Avenida Constitución s/n, PO Box 221, B6700ZBA, Lujan, Buenos Aires, Argentina.

D Corresponding author. Email: solebyrne@gmail.com

Marine and Freshwater Research 72(5) 668-678 https://doi.org/10.1071/MF20157
Submitted: 21 May 2020  Accepted: 14 September 2020   Published: 26 November 2020

Abstract

Cnesterodon decemmaculatus, which is a freshwater fish abundant in the Pampean region of Argentina, is used as a bioindicator of the status of watercourses throughout its distribution area. This work aimed to (1) evaluate the genetic diversity and population structure of C. decemmaculatus from two river basins in north-eastern Buenos Aires province, Argentina, (2) assess a possible association between genetic structure and the geographical distribution of river basins, including in the analysis data of populations from the south of the province, and (3) validate the use of the species as a bioindicator of the ecological status of watercourses in north-eastern Buenos Aires province. The analysis of a 700-bp fragment of the mitochondrial DNA control region showed moderate to high levels of genetic diversity and lack of genetic structure between the north-eastern basins, validating the use of this species as a bioindicator. Significant differences in genetic structure were found among basins at a regional scale. The lack of genetic structure between the north-eastern basins may result from historical and current events, whereas genetic differences between the north-eastern and southern basins may be explained by the absence of physical connections between them.

Keywords: genetic structure, Luján river, mitochondrial control region, Reconquista River.


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