Population structure of mud flounder Paralichthys orbignyanus from the south-western Atlantic Ocean.

Autor: Fainburg L; Departamento de Biología-Instituto de Investigaciones Marinas y Costeras, Laboratorio de Genética, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina., Sabadin D; Instituto de Investigaciones Marinas y Costeras, Laboratorio Biología de Peces, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina., Díaz de Astarloa JM; Departamento de Biología-Instituto de Investigaciones Marinas y Costeras, Laboratorio de Biotaxonomía Morfológica y Molecular de Peces (BIMOPE), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina., Fernández Iriarte P; Departamento de Biología-Instituto de Investigaciones Marinas y Costeras, Laboratorio de Genética, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2023 Feb; Vol. 102 (2), pp. 455-464. Date of Electronic Publication: 2022 Dec 13.
DOI: 10.1111/jfb.15271
Abstrakt: The mud flounder Paralichthys orbignyanus (Pleuronectiformes, Paralichthyidae) inhabits shallow waters of low salinities and mud bottoms in the temperate marine coastal regions of the Bonaerensean Ecoregion of the Argentinean Biogeographic Province in the south-western Atlantic Ocean. Specimens of P. orbignyanus were collected from Lagoa dos Patos (LDP) (southern Brazil), Mar Chiquita (MCH) and Marisol (MAR) both located in Buenos Aires (Argentina), and San Antonio Oeste (SAO) in the San Matías Gulf, Rio Negro (Argentina). A fragment of the mitochondrial DNA of the Control Region and seven microsatellite loci were characterized. In the Control Region, P. orbignyanus showed high variability, low nucleotide diversity, mild population expansion and a coalescence time of 35,000 years before the present. Flounders provided evidence of a genetic structure between the sampling sites LDP, MCH, MAR vs. SAO. On the other hand, P. orbignyanus displayed a lower to moderate contemporary genetic structure among all samples except between LDP and MCH. With no evidence of isolation by distance, this analysis supports a model of limited gene flow that is likely to be associated with a consistent larvae retention in all sampling sites. In addition, the present connectivity is ascribed to a lower migration process from SAO in the San Matías Gulf congruent with the prevailing littoral drift.
(© 2022 Fisheries Society of the British Isles.)
Databáze: MEDLINE
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