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2 resultados encontrados para: AUTOR: Pliego Cárdenas, Ricardo
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Resumen en: Inglés |
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The common octopus of the Veracruz Reef System (VRS, southwestern Gulf of Mexico) has historically been considered as Octopus vulgaris, and yet, to date, no study including both morphological and genetic data has tested that assumption. To assess this matter, 52 octopuses were sampled in different reefs within the VRS to determine the taxonomic identity of this commercially valuable species using an integrative taxonomic approach through both morphological and genetic analyses. Morphological and genetic data confirmed that the common octopus of the VRS is not O. vulgarisand determined that it is, in fact, the recently described O. insularis. Morphological measurements, counts, indices, and other characteristics such as specific colour patterns, closely matched what had been reported for O. insularis in Brazil. In addition, sequences from cytochrome oxidase I (COI) and 16S ribosomal RNA (r16S) mitochondrial genes confirmed that the common octopus from the VRS is in the same highly supported clade as O. insularisfrom Brazil. Genetic distances of both mitochondrial genes as well as of cytochrome oxidase subunit III (COIII) and novel nuclear rhodopsin sequences for the species, also confirmed this finding (0–0.8%). We discuss our findings in the light of the recent reports of octopus species misidentifications involving the members of the ‘O. vulgaris species complex’ and underscore the need for more morphological studies regarding this group to properly address the management of these commercially valuable and similar taxa.

Genetic evidence of the presence of Octopus mimus in the artisanal fisheries of octopus in Santa Elena Peninsula, Ecuador
Pliego Cárdenas, Ricardo ; Flores, Luis (coaut.) ; Markaida Aburto, Unai (coaut.) ; Barriga Sosa, Irene de los Ángeles (coaut.) ; Mora, Elba (coaut.) ; Arias, Evelyn (coaut.) ;
Contenido en: American Malacological Bulletin Vol. 34, no. 1 (June 2016), p. 51-55 ISSN: 2162-2698
Resumen en: Inglés |
Resumen en inglés

The geographic distribution of Octopus mimus Gould, 1852 is unclear, as most records are restricted to coastal localities of Peru and Chile, and some references have mentioned its presence off Central America. It is unknown whether this octopus is found off Ecuador as two previous unpublished records have suggested. The aim of the present study is to identify genetically the main octopus captured in a marine protected area known as Reserva de Produccion Faunistica Marino-Costera Puntilla de Santa Elena (REMACOPSE) off the Santa Elena peninsula, Ecuador. Samples collected from the local fishery were used to test the presence of this species based on the sequences of three mitochondrial markers and using a Bayesian approach. The phylogenetic analysis confirms that O. mimus inhabits the REMACOPSE. The results also indicate that the octopus specimens captured in the fishery from this marine protected area, are more closely related to O. mimus specimens from Central America than those from South America. The genetic identification of two groups of O. mimus could be associated with the different marine environmental conditions of the two biogeographic provinces. The finding in this study represents an important step for posterior research on the biology and fishery of octopus in Ecuador.