The role of the Sunda shelf biogeographic barrier in the cryptic differentiation of Conus litteratus (Gastropoda: Conidae) across the Indo-Pacific region

PeerJ

article

Shijin Ameri¹  Laxmilatha Pappurajam¹  K. A. Labeeb¹  Ranjith Lakshmanan³  Kathirvelpandian P. V. Ayyathurai⁴ 

[1] Central Marine Fisheries Research Institute;School of Biosciences, Mangalore University;Tuticorin Regional Station;PMFGR Centre

关键词: Mitochondrial markers;    Cryptic species;    Ocean currents;    Sunda shelf barrier;    Benthic ecology;    Conidae;   

DOI  :  10.7717/peerj.15534

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Geographical and oceanographic processes have influenced the speciation of marine organisms. Cone snails are marine mollusks that show high levels of endemism and a wide distributional range across the Indian and Pacific Oceans. Discontinuities in distributions caused by biogeographic barriers can affect genetic connectivity. Here we analysed the connectivity within Conus litteratus using samples from the Lakshadweep archipelago (Arabian Sea, Indian Ocean) and from the Pacific Ocean. Maximum likelihood analyses based on the mitochondrial cytochrome C oxidase subunit I (COI) and on the non-coding 16S ribosomal RNA (16S rRNA) genes revealed cryptic diversity within C. literatus occupying distinct oceanographic regions. The intraspecific genetic distances between the two distinct clades of C. literatus from the Arabian Sea and the Pacific Ocean ranged from 7.4% to 7.6% for COI and from 2.4% to 2.8% for 16S rRNA genes, which is larger than the threshold limit for interspecific differentiation. The haplotype network analysis also corroborated the existence of two different lineages within C. litteratus. The detected genetic discontinuities reflect the effect of the Sunda shelf biogeographic barrier on the allopatric divergence of C. litteratus.

【 授权许可】

CC BY