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Spatial genetic structure and demographic inference of the Patagonian squid Doryteuthis gahi in the south-eastern Pacific Ocean

Published online by Cambridge University Press:  19 April 2011

Christian M. Ibáñez ,
Juan Argüelles ,
Carmen Yamashiro ,
Luis Adasme ,
Renato Céspedes  and
Elie Poulin
Christian M. Ibáñez*
Affiliation:
Laboratorio de Ecología Molecular, Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425 Ñuñoa, Santiago, Chile
Juan Argüelles
Affiliation:
Unidad de Invertebrados Marinos, Instituto del Mar del Perú, Esquina Gamarra y General Valle s/n, Chucuito, Callao, Perú
Carmen Yamashiro
Affiliation:
Unidad de Invertebrados Marinos, Instituto del Mar del Perú, Esquina Gamarra y General Valle s/n, Chucuito, Callao, Perú
Luis Adasme
Affiliation:
Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile
Renato Céspedes
Affiliation:
Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile
Elie Poulin
Affiliation:
Laboratorio de Ecología Molecular, Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425 Ñuñoa, Santiago, Chile
*
Correspondence should be addressed to: C.M. Ibáñez, Laboratorio de Ecología Molecular, Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425 Ñuñoa, Santiago, Chile email: ibanez.christian@gmail.com
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Abstract

Doryteuthis gahi is a small squid species that has a wide distribution in South America. This species is characterized by coastal and benthic spawning, and its ontogenetic vertical migration is associated with upwelling zones, features that may restrict its dispersal potential. It has also been proposed that populations of these neritic squid are structured by the influence of local processes which act as barriers to gene flow. Based on this background, we evaluate the geographical structure of genetic diversity in D. gahi along its distribution in the south-eastern Pacific Ocean. We used 116 COI mtDNA sequences of squid collected from different sites in Peru and Chile and calculated genetic diversity, the population structure index Fst, and performed analysis of spatial molecular variance and exact tests to detect differences among localities. To infer demographic history we carried out tests of neutrality and Bayesian skyline analysis. Although there was little molecular divergence between Peru and Chile, we detected a significant genetic differentiation of D. gahi along its geographical distribution. Squid from Chile showed higher genetic diversity than those of Peru and the results of the demographic inference analysis suggest that the population of Peru is experiencing or experienced in the recent past demographic expansion, a pattern that was not found in Chile. We think that the current genetic patterns are consequences of northward migrations in the glaciation periods and posterior re-colonization of southern Chile in the deglacial period.

Keywords

Doryteuthis gahisquidsgenetic diversitymigrationpopulations
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 1 , February 2012 , pp. 197 - 203
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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