Diversity and population genetic structure of Octopus hubbsorum in the Mexican Pacific inferred from mitochondrial DNA sequences

Abstract

Octopus hubbsorum is the most commonly captured species of octopus on the western coast of Mexico. Despite the commercial importance of this species, management information remains scarce. We determined the genetic diversity and population genetic structure of O. hubbsorum by using mtDNA sequences (COI and ND5). The population structure was not supported by AMOVA or a spatial clustering model. Furthermore, an isolation by distance model did not explain our data. Three haplogroups were detected using a Bayesian assignment; however, the distribution of these haplogroups did not differ among the sampling sites. Our results indicated historical processes of a sudden population expansion, as has been reported for other species in the study region as consequence of climatic changes. However, this expansion did not affect the distribution of the mitochondrial lineages analysed in the study. The weak population genetic structure in O. hubbsorum associated with the life history of the species can explain our results. We suggest that to expand knowledge regarding the genetic structure and population dynamics of O. hubbsorum throughout its range, markers such as microsatellites or single-nucleotide polymorphisms (SNPs) are needed. Thus, on the basis of the information available, the studied population should be assumed to have a weak genetic structure.

Genetic analysis of Octopus cyanea reveals high gene flow in the South‐West Indian Ocean

“…The Hasegawa‐Kishino‐Yano substitution model (HKY) was identified as the best fit by the Bayesian information criterion (−lnL = 664.31, BIC = 1583.97) in jModelTest version 2.1.1 (Darriba et al., 2015). Since the analysis was performed on an intraspecies dataset, a strict clock model was selected as done in Octopus hubbsorum (S. S. Berry, 1953) (Dueñas‐Romero et al., 2020). Markov‐chain Monte Carlo (MCMC) was run using a single chain of 5 × 10 7 iterations, sampling every 5000 generations; the first 5 × 10 6 chains were discarded as burn‐in.…”

Population Structure of Wild Schizothorax kozlovi in the Upper Yangtze River Based on mtDNA and Stable Isotopes, and Their Relationship with Ambient Temperature

“…On the other hand, genetic diversity is defined as an important measure of population structure, exhibiting genetic composition patterns and genetic variability in the current population, or reflecting vicarious events from its past that may have shaped their population history. Because of the ability of mitochondrial DNA (mtDNA) sequences to detect population differences, phylogeographic patterns [22], historical demographic events [23] and the existence of cryptic species or subspecies [24], mtDNA genes, including Cytb, COI and ND2, have been widely used [25][26][27][28].…”

Estructura genética poblacional y filogeografía de Octopus mimus (Cephalopoda: Octopodidae) en el Pacífico oriental tropical determinada mediante loci microsatélites polimórficos

“…Domínguez-Contreras et al (2018), ya que se observó para O. mimus una alta estructura y diversidad genética y un promedio del número de alelos por locus (Na = 7.26) similar al del presente estudio (Na = 8.583). Los loci heterólogos son más polimórficos y pueden amplificar de mejor forma en especies genéticamente cercanas de donde se derivaron originalmente los microsatélites(Dawson et al, 2013), como es el caso entre O. mimus y O. bimaculatus.Niveles moderados y relativamente altos de diversidad genética en O. mimus han sido reportados en varios estudios(Pardo-Gandarillas et al, 2017;Dueñas-Romero et al, 2020;Pliego- Cárdenas et al, 2020) Pardo-Gandarillas et al (2017). indicaron un patrón de diversidad genética que decrece del sur de Perú hacia el sur de Chile, debido a las fluctuaciones demográficas en la población de O. mimus que influyen en la diversidad genética de la especie, a la presión selectiva en el sistema de corrientes de Humboldt y a los cambios en las condiciones oceanográficas que ocurrieron durante la última glaciación máxima.…”