Genome-wide comparisons reveal a clinal species pattern within a holobenthic octopod - the Australian Southern blue-ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae)

Morse, Peter, Kjeldsen, Shannon R., Meekan, Mark G., McCormick, Mark I., Finn, Julian, Huffard, Christine L., and Zenger, Kyall R. (2018) Genome-wide comparisons reveal a clinal species pattern within a holobenthic octopod - the Australian Southern blue-ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae). Ecology and Evolution, 8 (4). pp. 2253-2267.

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Abstract

The southern blue-ringed octopus, Hapalochlaena maculosa (Hoyle, 1883) lacks a planktonic dispersal phase, yet ranges across Australia’s southern coastline. This species’ brief and holobenthic life history suggests gene flow might be limited, leaving distant populations prone to strong genetic divergence. This study used 17,523 genome-wide SNP loci to investigate genetic structuring and local adaptation patterns of H. maculosa among eight sampling sites along its reported range. Within sites, interrelatedness was very high, consistent with the limited dispersal of this taxon. However, inbreeding coefficients were proportionally lower among sites where substructuring was not detected, suggesting H. maculosa might possess a mechanism for inbreeding avoidance. Genetic divergence was extremely high among all sites, with the greatest divergence observed between both ends of the distribution, Fremantle, WA, and Stanley, TAS. Genetic distances closely followed an isolation by geographic distance pattern. Outlier analyses revealed distinct selection signatures at all sites, with the strongest divergence reported between Fremantle and the other Western Australian sites. Phylogenetic reconstructions using the described sister taxon H. fasciata (Hoyle, 1886) further supported that the genetic divergence between distal H. maculosa sites in this study was equivalent to that of between established heterospecifics within this genus. However, it is advocated that taxonomic delineations within this species should be made with caution. These data indicate that H. maculosa forms a clinal species pattern across its geographic range, with gene flow present through allele sharing between adjacent populations. Morphological investigations are recommended for a robust resolution of the taxonomic identity and ecotype boundaries of this species

Item ID: 53120
Item Type: Article (Research - C1)
ISSN: 2045-7758
Keywords: adaptive radiation; cryptic subspecies; ecological genomics; population genetics; SNP
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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Funders: Australia and Pacific Science Foundation
Date Deposited: 13 Apr 2018 00:07
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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