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Hydrobiologia

, Volume 808, Issue 1, pp 125–135 | Cite as

Demographic inference and genetic diversity of Octopus mimus (Cephalopoda: Octopodidae) throughout the Humboldt Current System

  • M. Cecilia Pardo-Gandarillas
  • Christian M. Ibáñez
  • Carmen Yamashiro
  • Marco A. Méndez
  • Elie Poulin
CEPHALOPOD ECOLOGY AND LIFE CYCLES

Abstract

Climatic and oceanographic events occurring during the last glacial cycle in the Humboldt Current System (HCS) have left genetic footprints in marine invertebrate populations. The objective of this study was to evaluate the effect of the glacial period on Octopus mimus populations found throughout the HCS. This species lays a large number of small eggs which hatch into planktonic paralarvae with the potential to undergo wide dispersal. We sequenced the COIII gene to perform phylogeographic analyses of 197 octopuses sampled from seven localities. The genetic diversity of Octopus mimus was low and decreased towards the southern end of the distribution range, which comprises a single population. The haplotype genealogy and Bayesian Skyride plot suggest that O. mimus underwent a demographic expansion after the last glacial maximum (LGM). This would imply a contraction of the range of this organism toward northern latitudes during the LGM followed by southward expansion and recolonization once the contemporary interglacial period began.

Keywords

Phylogeography Paralarvae Glaciation Octopus Coalescence 

Notes

Acknowledgements

We thank all our colleagues, institutions, and projects, national and international, who helped us obtain octopus samples: Juan Arguelles and other Peruvian colleagues of the coastal laboratories in Ilo, Callao, and Paita of the IMARPE. We also thank Ricardo Galleguillos, Cristián E. Hernández, and Sandra Ferrada, who contributed octopus samples from Project-FIP 2008-39. This study was supported by the following Grants, Institutions, and Projects: Thesis support Grant AT2480029, Project P05-002 ICM (Institute of Ecology and Biodiversity, Universidad de Chile), and MECESUP UCO-0214.

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Authors and Affiliations

  1. 1.Departamento de Ciencias Ecológicas, Facultad de CienciasUniversidad de ChileÑuñoa, SantiagoChile
  2. 2.Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos NaturalesUniversidad Andres BelloSantiagoChile
  3. 3.Instituto del Mar del PerúCallaoPeru
  4. 4.Departamento de Ciencias Ecológicas, Facultad de Ciencias, Instituto de Ecología y BiodiversidadUniversidad de ChileÑuñoa, SantiagoChile

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