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Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis(Cephalopoda:Ommastrephidae)from the Indian Ocean

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Integrative Zoology 2023年第5期18卷 924-948页

作者： Nikarthil SJEENA Kurichithara KSAJIKUMAR Summaya RAHUMAN Nadakkal RAGESH KPSaid KOYA Shunmugavel CHINNADURAI Geetha S.ASIKUMAR Kolliyil SMOHAMED ICAR-Central Marine Fisheries Research Institute KochiKeralaIndia and 2Fishing Technology DivisionVeraval Research Centre of ICAR-Central Institute of Fisheries TechnologyMatsyabhavanBhidiaVeravalGujaratIndia

Sthenoteuthis oualaniensis is known for its complex population structure with three major transoceanic forms(***-sized,dwarf,and giant forms)whose taxonomic status has been disputed for *** integrated taxonomic study examines these prevenient morphotypes gathered on cruises in the Indian Ocean to ascertain their status in the evolutionary history of the *** analyses employing mitochondrial(COI,ND2)and nuclear(H3)markers revealed four genetically distinct and novel lineages of the species in the Indian Ocean,representing three morphotypes from the Arabian Sea and one from the Southern Indian *** mitochondrial-based phylograms revealed two distinct clades in the species:“dwarf forms+giant form”and“middle-sized forms,”which further branch into geographically structured evolutionary *** delimitation analyses recovered five distinct clades,namely,the Arabian Sea giant and dwarf forms,Equatorial,Eastern Typical,and Other Middle-sized forms,representing the consensus molecular operational taxonomic units.H3 being heterozygous could not resolve the *** network and AMOVA analysis of mtDNA genes indicated explicit phylogeographic structuring of haplotypes,whereas these outputs and PCA results were incongruent with the morphological *** features distinguishing the morphotypes were sometimes plastic and mismatched with the *** giant form was genetically close to the dwarf forms,contradicting the earlier notion that it descended from the middle-sized *** may be assumed that the dwarf form evolved following sympatric speciation and adaptation to warm equatorial waters,while the focal features of the Western Arabian Sea guide toward allopatric speciation of the giant form.

关键词： Arabian Sea haplotype network molecular operational taxonomic units morphotypes PCA phylogeny purpleback flying squid

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