Central Marine Fisheries Research Institute, Ernakulam, Kerala, India.
School of Biosciences, Mangalore University, Mangalore, India.
PeerJ. 2023 Jul 14;11:e15534. doi: 10.7717/peerj.15534. eCollection 2023.
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 using samples from the Lakshadweep archipelago (Arabian Sea, Indian Ocean) and from the Pacific Ocean. Maximum likelihood analyses based on the mitochondrial cytochrome oxidase subunit I (COI) and on the non-coding 16S ribosomal RNA (16S rRNA) genes revealed cryptic diversity within occupying distinct oceanographic regions. The intraspecific genetic distances between the two distinct clades of 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 . The detected genetic discontinuities reflect the effect of the Sunda shelf biogeographic barrier on the allopatric divergence of .
地理和海洋过程影响了海洋生物的物种形成。圆锥蜗牛是海洋软体动物，表现出高度的特有性和广泛的分布范围，横跨印度洋和太平洋。由生物地理屏障引起的分布不连续性会影响遗传连通性。在这里，我们分析了利用来自拉克沙群岛（阿拉伯海，印度洋）和太平洋的样本进行的 内的连通性。基于线粒体细胞色素氧化酶亚基 I（COI）和非编码 16S 核糖体 RNA（16S rRNA）基因的最大似然分析揭示了在占据不同海洋学区域的 内存在隐生多样性。来自阿拉伯海和太平洋的两个不同 分支之间的种内遗传距离，COI 为 7.4%至 7.6%，16S rRNA 基因为 2.4%至 2.8%，大于种间分化的阈值极限。单倍型网络分析也证实了 内存在两个不同的谱系。检测到的遗传不连续性反映了巽他陆架生物地理屏障对 的异域分歧的影响。
