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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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Title Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) from the Indian Ocean
Not Available
 
Creator Jeena, N. S
Sajikumar, K. K.
Rahuman, S.
Ragesh, N.
Koya, K. P.
Chinnadurai, S.
Sasikumar, G.
Mohamed, K. S.
 
Subject Arabian Sea
Haplotype network
Molecular operational taxonomic units
Morphotypes
PCA
Phylogeny
Purpleback flying squid
 
Description Not Available
Sthenoteuthis oualaniensis is known for its complex population structure with three major transoceanic forms (viz.
middle-sized, dwarf, and giant forms) whose taxonomic status has been disputed for decades. This integrated taxo nomic study examines these prevenient morphotypes gathered on cruises in the Indian Ocean to ascertain their sta tus in the evolutionary history of the species. Molecular 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 Ocean. The mitochondrial-based phy lograms revealed two distinct clades in the species: “dwarf forms + giant form” and “middle-sized forms,” which
further branch into geographically structured evolutionary units. Species delimitation analyses recovered five dis tinct 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 phylogeny. Haplotype network and AMOVA analysis of mtDNA genes indicated explicit phylogeographic struc turing of haplotypes, whereas these outputs and PCA results were incongruent with the morphological grouping.
Phenetic features distinguishing the morphotypes were sometimes plastic and mismatched with the genotypes. The
giant form was genetically close to the dwarf forms, contradicting the earlier notion that it descended from the
middle-sized form. It 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.
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Date 2024-06-07T18:29:25Z
2024-06-07T18:29:25Z
2023-09-01
 
Type Research Paper
 
Identifier Jeena, N. S., Sajikumar, K. K., Rahuman, S., Ragesh, N., Koya, K. P., Chinnadurai, S., Sasikumar, G. and Mohamed, K. S. (2023) Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) from the Indian Ocean. Integrative Zoology. 18(5):924-948.
1749-4877
http://krishi.icar.gov.in/jspui/handle/123456789/83349
 
Language English
 
Relation Not Available;
 
Publisher Wiley