Genetic evidence extends the known distribution of Octopus insularis to the mid-Atlantic islands Ascension and St Helena

Amor, Michael D., Laptikhovsky, Vladimir, Norman, Mark, and Strugnell, Jan M. (2017) Genetic evidence extends the known distribution of Octopus insularis to the mid-Atlantic islands Ascension and St Helena. Journal of the Marine Biological Association of the United Kingdom, 97 (4). pp. 753-758.

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Abstract

Recent molecular studies have proved beneficial in providing taxonomic resolution within the Octopus vulgaris species complex, therefore aiding in the appropriate management of this high value global fisheries resource. This study used the mitochondrial 'barcode of life' gene Cytochrome Oxidase subunit I (COI) to investigate the identity of shallow-water benthic octopuses in the mid-Atlantic Ocean and their relationship to members of the Octopus vulgaris species complex. Maximum likelihood and Bayesian phylogenetic inference placed individuals collected from two tropical islands, Ascension and St Helena, into a highly supported monophyletic clade with the North Brazilian species O. insularis (BS = 81, PP = 1), extending the known distribution of O. insularis to Ascension and St Helena Islands. Octopus vulgaris and two other member species of the O. vulgaris species complex, O. tetricus and O. cf. tetricus formed a highly supported monophyletic clade (BS = 99, PP = 1). Interspecific distances between the O. mimus group (O. mimus, O. bimaculoides, O. maya and O. insularis) and the O. vulgaris species group (O. vulgaris, O. tetricus and O. cf. tetricus) ranged from 14.7–26.0%, and an estimated date of divergence suggests these groups diverged from a common ancestor between 19.0 and 40.9 million years ago.

Item ID: 46435
Item Type: Article (Refereed Research - C1)
Keywords: Octopus vulgaris, O. occidentalis, O. sanctaehelenae, COI, phylogenetics, taxonomy, cryptic species complex, marine invertebrate
ISSN: 1469-7769
Funders: Darwin Initiative for the Survival of the Species (DISS), La Trobe University
Projects and Grants: DISS EIDCF01
Date Deposited: 06 Dec 2016 22:24
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060309 Phylogeny and Comparative Analysis @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830203 Wild Caught Edible Molluscs @ 100%
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