Dudoit 'Ale'alani, Iacchei Matthew, Coleman Richard R, Gaither Michelle R, Browne William E, Bowen Brian W, Toonen Robert J
Hawai'i Institute of Marine Biology, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa, Kāne'ohe, HI, United States of America.
Department of Zoology, University of Hawai'i at Mānoa, Honolulu, HI, United States of America.
PeerJ. 2018 Mar 6;6:e4409. doi: 10.7717/peerj.4409. eCollection 2018.
The banded coral shrimp, (Crustacea: Decapoda: Stenopodidea) is a popular marine ornamental species with a circumtropical distribution. The planktonic larval stage lasts ∼120-253 days, indicating considerable dispersal potential, but few studies have investigated genetic connectivity on a global scale in marine invertebrates. To resolve patterns of divergence and phylogeography of , we surveyed 525 bp of mitochondrial cytochrome oxidase subunit I (COI) from 198 individuals sampled at 10 locations across ∼27,000 km of the species range. Phylogenetic analyses reveal that has a Western Atlantic lineage and a widely distributed Indo-Pacific lineage, separated by sequence divergence of 2.1%. Genetic diversity is much higher in the Western Atlantic ( = 0.929; = 0.004) relative to the Indo-Pacific ( = 0.105; < 0.001), and coalescent analyses indicate that the Indo-Pacific population expanded more recently (95% HPD (highest posterior density) = 60,000-400,000 yr) than the Western Atlantic population (95% HPD = 300,000-760,000 yr). Divergence of the Western Atlantic and Pacific lineages is estimated at 710,000-1.8 million years ago, which does not readily align with commonly implicated colonization events between the ocean basins. The estimated age of populations contradicts the prevailing dispersal route for tropical marine biodiversity (Indo-Pacific to Atlantic) with the oldest and most diverse population in the Atlantic, and a recent population expansion with a single common haplotype shared throughout the vast Indian and Pacific oceans. In contrast to the circumtropical fishes, this diminutive reef shrimp challenges our understanding of conventional dispersal capabilities of marine species.
带状珊瑚虾（甲壳纲：十足目：猬虾下目）是一种广受欢迎的海洋观赏物种，分布于热带地区。浮游幼虫阶段持续约120 - 253天，表明其具有相当大的扩散潜力，但很少有研究在全球范围内调查海洋无脊椎动物的遗传连通性。为了解带状珊瑚虾的分化模式和系统地理学，我们对该物种分布范围内约27,000公里的10个地点采集的198个个体的线粒体细胞色素氧化酶亚基I（COI）的525 bp进行了测序。系统发育分析表明，带状珊瑚虾有一个西大西洋谱系和一个广泛分布的印度 - 太平洋谱系，序列差异为2.1%。相对于印度 - 太平洋地区（= 0.105；< 0.001），西大西洋地区的遗传多样性要高得多（= 0.929；= 0.004），溯祖分析表明，印度 - 太平洋种群的扩张时间比西大西洋种群更近（95%最高后验密度（HPD）= 60,000 - 400,000年）（95% HPD = 300,000 - 760,000年）。西大西洋和太平洋谱系的分化估计在710,000 - 180万年前，这与海洋盆地之间常见的殖民事件不太相符。种群的估计年龄与热带海洋生物多样性的主要扩散路线（印度 - 太平洋到大西洋）相矛盾，大西洋拥有最古老和最多样化的种群，而最近的种群扩张则伴随着一个在广阔的印度洋和太平洋中共享的单一常见单倍型。与环热带鱼类不同，这种小型礁虾挑战了我们对海洋物种传统扩散能力的理解。
