Complementarity and discriminatory power of genotype and otolith shape in describing the fine-scale population structure of an exploited fish, the common sole of the Eastern English Channel

Type Article
Date 2020-11
Language English
Author(s) Randon Marine1, 2, Le Pape Olivier1, Ernande BrunoORCID3, 4, Mahé KeligORCID3, Volckaert Filip A. M.1, 5, Petit Eric1, Lassalle Gilles1, Le Berre Thomas1, Réveillac Elodie1
Affiliation(s) 1 : ESE, Ecologie et Sante´ des Ecosystèmes, Institut Agro - Agrocampus Ouest, INRAE, Rennes, France
2 : Statistical and Actuarial Science Department, Simon Fraser University, Burnaby, British Columbia, Canada
3 : Ifremer, Laboratory of Fisheries – Sclerochronology Centre, Boulogne-sur-Mer, France
4 : IIASA, Evolution and Ecology Program, Schlossplatz, Laxenburg, Austria
5 : Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium
6 : UMR 7266 LIENSs, Littoral, Environnement et Societes, La Rochelle University - CNRS, La Rochelle, France
Source Plos One (1932-6203) (Public Library of Science (PLoS)), 2020-11 , Vol. 15 , N. 11 , P. e0241429 (20p.)
DOI 10.1371/journal.pone.0241429
WOS© Times Cited 4
Abstract

Marine organisms show population structure at a relatively fine spatial scale, even in open habitats. The tools commonly used to assess subtle patterns of connectivity have diverse levels of resolution and can complement each other to inform on population structure. We assessed and compared the discriminatory power of genetic markers and otolith shape to reveal the population structure on evolutionary and ecological time scales of the common sole (Solea solea), living in the Eastern English Channel (EEC) stock off France and the UK. First, we genotyped fish with Single Nucleotide Polymorphisms to assess population structure at an evolutionary scale. Then, we tested for spatial segregation of the subunits using otolith shape as an integrative tracer of life history. Finally, a supervised machine learning framework was applied to genotypes and otolith phenotypes to probabilistically assign adults to subunits and assess the discriminatory power of each approach. Low but significant genetic differentiation was found among subunits. Moreover, otolith shape appeared to vary spatially, suggesting spatial population structure at fine spatial scale. However, results of the supervised discriminant analyses failed to discriminate among subunits, especially for otolith shape. We suggest that the degree of population segregation may not be strong enough to allow for robust fish assignments. Finally, this study revealed a weak yet existing metapopulation structure of common sole at the fine spatial scale of the EEC based on genotypes and otolith shape, with one subunit being more isolated. Our study argues for the use of complementary tracers to investigate marine population structure.

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Randon Marine, Le Pape Olivier, Ernande Bruno, Mahé Kelig, Volckaert Filip A. M., Petit Eric, Lassalle Gilles, Le Berre Thomas, Réveillac Elodie (2020). Complementarity and discriminatory power of genotype and otolith shape in describing the fine-scale population structure of an exploited fish, the common sole of the Eastern English Channel. Plos One, 15(11), e0241429 (20p.). Publisher's official version : https://doi.org/10.1371/journal.pone.0241429 , Open Access version : https://archimer.ifremer.fr/doc/00658/77009/