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Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses

Despite extensive revisions over recent decades, the taxonomy of benthic octopuses (Family Octopodidae) remains in a considerable flux. Among groups of unresolved status is a species complex of morphologically similar shallow-water octopods from subtropical Australasia, including: Allopatric populat...

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Autores principales: Amor, Michael D., Norman, Mark D., Cameron, Hayley E., Strugnell, Jan M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4070898/
https://www.ncbi.nlm.nih.gov/pubmed/24964133
http://dx.doi.org/10.1371/journal.pone.0098982
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author Amor, Michael D.
Norman, Mark D.
Cameron, Hayley E.
Strugnell, Jan M.
author_facet Amor, Michael D.
Norman, Mark D.
Cameron, Hayley E.
Strugnell, Jan M.
author_sort Amor, Michael D.
collection PubMed
description Despite extensive revisions over recent decades, the taxonomy of benthic octopuses (Family Octopodidae) remains in a considerable flux. Among groups of unresolved status is a species complex of morphologically similar shallow-water octopods from subtropical Australasia, including: Allopatric populations of Octopus tetricus on the eastern and western coasts of Australia, of which the Western Australian form is speculated to be a distinct or sub-species; and Octopus gibbsi from New Zealand, a proposed synonym of Australian forms. This study employed a combination of molecular and morphological techniques to resolve the taxonomic status of the ‘tetricus complex’. Phylogenetic analyses (based on five mitochondrial genes: 12S rRNA, 16S rRNA, COI, COIII and Cytb) and Generalised Mixed Yule Coalescent (GMYC) analysis (based on COI, COIII and Cytb) distinguished eastern and Western Australian O. tetricus as distinct species, while O. gibbsi was found to be synonymous with the east Australian form (BS = >97, PP = 1; GMYC p = 0.01). Discrete morphological differences in mature male octopuses (based on sixteen morphological traits) provided further evidence of cryptic speciation between east (including New Zealand) and west coast populations; although females proved less useful in morphological distinction among members of the tetricus complex. In addition, phylogenetic analyses suggested populations of octopuses currently treated under the name Octopus vulgaris are paraphyletic; providing evidence of cryptic speciation among global populations of O. vulgaris, the most commercially valuable octopus species worldwide.
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spelling pubmed-40708982014-06-27 Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses Amor, Michael D. Norman, Mark D. Cameron, Hayley E. Strugnell, Jan M. PLoS One Research Article Despite extensive revisions over recent decades, the taxonomy of benthic octopuses (Family Octopodidae) remains in a considerable flux. Among groups of unresolved status is a species complex of morphologically similar shallow-water octopods from subtropical Australasia, including: Allopatric populations of Octopus tetricus on the eastern and western coasts of Australia, of which the Western Australian form is speculated to be a distinct or sub-species; and Octopus gibbsi from New Zealand, a proposed synonym of Australian forms. This study employed a combination of molecular and morphological techniques to resolve the taxonomic status of the ‘tetricus complex’. Phylogenetic analyses (based on five mitochondrial genes: 12S rRNA, 16S rRNA, COI, COIII and Cytb) and Generalised Mixed Yule Coalescent (GMYC) analysis (based on COI, COIII and Cytb) distinguished eastern and Western Australian O. tetricus as distinct species, while O. gibbsi was found to be synonymous with the east Australian form (BS = >97, PP = 1; GMYC p = 0.01). Discrete morphological differences in mature male octopuses (based on sixteen morphological traits) provided further evidence of cryptic speciation between east (including New Zealand) and west coast populations; although females proved less useful in morphological distinction among members of the tetricus complex. In addition, phylogenetic analyses suggested populations of octopuses currently treated under the name Octopus vulgaris are paraphyletic; providing evidence of cryptic speciation among global populations of O. vulgaris, the most commercially valuable octopus species worldwide. Public Library of Science 2014-06-25 /pmc/articles/PMC4070898/ /pubmed/24964133 http://dx.doi.org/10.1371/journal.pone.0098982 Text en © 2014 Amor et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Amor, Michael D.
Norman, Mark D.
Cameron, Hayley E.
Strugnell, Jan M.
Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses
title Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses
title_full Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses
title_fullStr Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses
title_full_unstemmed Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses
title_short Allopatric Speciation within a Cryptic Species Complex of Australasian Octopuses
title_sort allopatric speciation within a cryptic species complex of australasian octopuses
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4070898/
https://www.ncbi.nlm.nih.gov/pubmed/24964133
http://dx.doi.org/10.1371/journal.pone.0098982
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