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PeerJ. 2018 Jan 16;6:e4173. doi: 10.7717/peerj.4173. eCollection 2018.

Population genetic structure of Patagonian toothfish (Dissostichus eleginoides) in the Southeast Pacific and Southwest Atlantic Ocean.

Author information

1
Centro i˜mar, Universidad de Los Lagos, Camino Chinquihue Km 6, Puerto Montt, Chile.
2
Laboratorio de Genética y Acuicultura, Departamento de Oceanografía, Universidad de Concepción, Concepción, Chile.
3
Laboratorio de Ecología Evolutiva y Filoinformática, Departamento de Zoología, Universidad de Concepción, Concepción, Chile.
4
Núcleo Milenio INVASAL, Concepción, Chile.
5
Programa de Doctorado en Sistemática y Biodiversidad, Universidad de Concepción, Concepción, Chile.
6
Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.

Abstract

Previous studies of population genetic structure in Dissostichus eleginoides have shown that oceanographic and geographic discontinuities drive in this species population differentiation. Studies have focused on the genetics of D. eleginoides in the Southern Ocean; however, there is little knowledge of their genetic variation along the South American continental shelf. In this study, we used a panel of six microsatellites to test whether D. eleginoides shows population genetic structuring in this region. We hypothesized that this species would show zero or very limited genetic structuring due to the habitat continuity along the South American shelf from Peru in the Pacific Ocean to the Falkland Islands in the Atlantic Ocean. We used Bayesian and traditional analyses to evaluate population genetic structure, and we estimated the number of putative migrants and effective population size. Consistent with our predictions, our results showed no significant genetic structuring among populations of the South American continental shelf but supported two significant and well-defined genetic clusters of D. eleginoides between regions (South American continental shelf and South Georgia clusters). Genetic connectivity between these two clusters was 11.3% of putative migrants from the South American cluster to the South Georgia Island and 0.7% in the opposite direction. Effective population size was higher in locations from the South American continental shelf as compared with the South Georgia Island. Overall, our results support that the continuity of the deep-sea habitat along the continental shelf and the biological features of the study species are plausible drivers of intraspecific population genetic structuring across the distribution of D. eleginoides on the South American continental shelf.

KEYWORDS:

Abyssal depths; Antarctic circumpolar current; Deep-sea environment; Gene flow; Genetic connectivity; Genetic differentiation; Geographical isolation; Microevolution

Conflict of interest statement

The authors declare there are no competing interests.

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