title: Genetic analyses of two spawning stocks of the short-finned squid (Illex argentinus) using nuclear and mitochondrial data.
abstract: Short-finned squid Illex argentinus (Omastrephidae) is an economically important species which supports a long-term and intensive commercial fishery in the South-West Atlantic Ocean. In this study, the genetic variability of allozymes (40 loci) and mitochondrial regions, COI (556 bp) and 16S rDNA (439 bp), were addressed in the two most important species' spawning stocks, the Summer Spawning Stock (SSS) and the South Patagonic Stock (SPS). Five out of 20 polymorphic allozyme loci were polymorphic at 95% criterion and heterozygosity levels were low. The concatenated analysis of mitochondrial molecular markers revealed high to low values of haplotype and nucleotide diversity, respectively. Nuclear and mitochondrial data revealed no significant genetic differences between these two spawning stocks. Our results and the biological characteristics of I. argentinus deal with a no simple genetic structure of populations described as spatial and temporal chaotic patchiness. SSS and SPS spawning stocks of I. argentinus could not be elevated to the status of genetic stocks.
authors.affiliation: Laboratori d'Ictiologia Genètica, Campus Montilivi, Universitat de Girona, 17071 Girona, Spain. Electronic address: marina.roldan@udg.edu.
authors.forename: María Inés
authors.initials: MI
authors.lastname: Roldán
authors.affiliation: Laboratori d'Ictiologia Genètica, Campus Montilivi, Universitat de Girona, 17071 Girona, Spain.
authors.forename: Laia
authors.initials: L
authors.lastname: Planella
authors.affiliation: Laboratori d'Ictiologia Genètica, Campus Montilivi, Universitat de Girona, 17071 Girona, Spain.
authors.forename: Sandra
authors.initials: S
authors.lastname: Heras
authors.affiliation: Laboratori d'Ictiologia Genètica, Campus Montilivi, Universitat de Girona, 17071 Girona, Spain.
authors.forename: María Victoria
authors.initials: MV
authors.lastname: Fernández
mesh_terms: D000483:Alleles; D000818:Animals; D001118:Argentina; D002467:Cell Nucleus / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics; D049832:Decapodiformes / Q000235:genetics*; D005787:Gene Frequency; D006239:Haplotypes; D008928:Mitochondria / Q000235:genetics*; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial; D012336:RNA, Ribosomal, 16S
keywords: 16S rDNA; Allozymes; COI; Calmar; Genetic variability; Illex argentinus; Spawning stock; Squid; Stock reproducteur; Variabilité génétique