Research Article

Marine Biology

, Volume 146, Issue 3, pp 559-569

Population genetics of the swimming crab Callinectes bellicosus (Brachyura: Portunidae) from the eastern Pacific Ocean

  • E. PfeilerAffiliated withCentro de Investigación en Alimentación y Desarrollo A.C., Unidad GuaymasSchool of Life Sciences, Arizona State University Email author 
  • , L. A. HurtadoAffiliated withDepartment of Ecology and Evolutionary Biology, University of Arizona
  • , L. L. KnowlesAffiliated withDepartment of Ecology and Evolutionary Biology, University of ArizonaDepartment of Ecology and Evolutionary Biology, University of Michigan
  • , J. Torre-CosíoAffiliated withComunidad y Biodiversidad A.C.
  • , L. Bourillón-MorenoAffiliated withComunidad y Biodiversidad A.C.
  • , J. F. Márquez-FaríasAffiliated withInstituto Nacional de la Pesca, Centro Regional de Investigación Pesquera
  • , G. Montemayor-LópezAffiliated withInstituto Nacional de la Pesca, Centro Regional de Investigación Pesquera

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Abstract

The population genetics and historical demography of the swimming crab Callinectes bellicosus from the eastern Pacific were assessed using mitochondrial DNA (mtDNA) sequences from portions of the cytochrome c oxidase subunit I (COI) and cytochrome b (Cytb) genes. Analysis of molecular variance of sequence data from crabs collected from nine localities, ranging from the upper to lower Gulf of California and the outer coast of the Baja California peninsula, revealed an absence of population structure, suggesting a high level of gene flow over a wide geographic area. Maximum-likelihood estimates of long-term effective population size obtained with the program FLUCTUATE, in addition to highly significant values obtained from neutrality tests (Tajima’s D, Fu and Li’s D, and Fu’s F S) and mismatch analysis, are consistent with a population expansion dating to the Pleistocene epoch. Phylogenetic analysis of C. bellicosus sequences using both neighbor-joining and Bayesian methods revealed a widely distributed subclade (clade II) cryptically embedded at low frequency in the main (clade I) population. Although sequence divergence between the two clades was low (1.1% COI; 0.6% Cytb), statistical support for the split was high. The Kimura-2-parameter genetic distance between C. bellicosus and the sympatric and morphologically similar C. arcuatus was high (d=0.17) and similar to the genetic distance between C. bellicosus and the allopatric C. sapidus from the western Atlantic (d=0.18), suggesting an ancient (Miocene) divergence of C. bellicosus and C. arcuatus.