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MEPS
Marine Ecology Progress Series

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MEPS 418:165-178 (2010)  -  DOI: https://doi.org/10.3354/meps08829

Ommastrephid squids Sthenoteuthis oualaniensis and Dosidicus gigas in the eastern Pacific show convergent biogeographic breaks but contrasting population structures

Danna J. Staaf1,*, R. I. Ruiz-Cooley2, Carl Elliger1, Zora Lebaric1, Bernardita Campos3, Unai Markaida4, William F. Gilly1

1Hopkins Marine Station of Stanford University, Oceanview Blvd, Pacific Grove, California 93950, USA
2Protected Resources Division, Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA,
3333 North Torrey Pines Court, La Jolla, California 92037, USA
3Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Valparaíso, PO Box 5080, Reñaca, Viña del Mar, Chile
4Línea de Pesquerías Artesanales, El Colegio de la Frontera Sur, CONACYT, Calle 10 #264, 24000 Campeche, Mexico

ABSTRACT: Dosidicus gigas and Sthenoteuthis oualaniensis (Teuthoidea: Ommastrephidae: Ommastrephinae) are abundant, ecologically important squid that co-occur in the eastern tropical Pacific. Little is known about the genetic basis of population structure in either species, although the presence of 2 species within S. oualaniensis has been suggested. We report here on a comparative population genetic study of D. gigas and S. oualaniensis using the mitochondrial marker NADH dehydrogenase subunit 2. Despite the high potential for dispersal in these active swimmers, both species exhibit a distinct biogeographic break at 5 to 6°N. S. oualaniensis contains multiple deeply divergent, geographically segregated clades, whereas D. gigas shows only mild divergence between northern and southern hemisphere populations. We suggest that dispersal and genetic mixing across the eastern tropical Pacific may be impeded by both oceanographic and ecological factors.


KEY WORDS: Biogeographic comparison · Eastern Pacific · Ommastrephid squid · Population genetic structure


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Cite this article as: Staaf DJ, Ruiz-Cooley RI, Elliger C, Lebaric Z, Campos B, Markaida U, Gilly WF (2010) Ommastrephid squids Sthenoteuthis oualaniensis and Dosidicus gigas in the eastern Pacific show convergent biogeographic breaks but contrasting population structures. Mar Ecol Prog Ser 418:165-178. https://doi.org/10.3354/meps08829

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