Low connectivity between 'scaly-foot gastropod' (Mollusca: Peltospiridae) populations at hydrothermal vents on the Southwest Indian Ridge and the Central Indian Ridge
Low connectivity between 'scaly-foot gastropod' (Mollusca: Peltospiridae) populations at hydrothermal vents on the Southwest Indian Ridge and the Central Indian Ridge
复制标题
DOI：
10.1007/s13127-015-0224-8
复制
发表时间：
2015-12-01
影响因子：
1.6
通讯作者：
Rogers, Alex D.
中科院分区：
文献类型：
--
作者：
Chen, Chong;Copley, Jonathan T.;Rogers, Alex D.
大洋中脊上的热液喷口呈斑块状分布，分布着许多深海化学合成环境特有的类群，其扩散可能受到地理屏障的限制。本研究的目的是调查印度洋热液喷口特有的鳞足腹足类的三个种群在中印度洋海脊(CIR)和西南印度洋海脊(SWIR)的第一个采样喷口(SWIR)的两个喷口区域之间的连通性。利用细胞色素氧化酶C亚单位I(COI)基因的489个核苷酸片段，研究了横跨两个大洋中脊的连通性和种群结构。所使用的系统地理学方法包括遗传分化的测量(F(ST))、简约单倍型网络的重建、错配分析和中立性测试。每代人的相对迁徙估计在田野之间。SWIR和CIR的通气场有显著差异(F(ST)=0.28-0.29，P<；0.001)。检测到的特征表明最近发生了瓶颈事件，随后所有人口都出现了人口扩张。与CIR喷口之间的数值相比，SWIR和CIR之间对移民相对数量的估计相对较低。这项研究是首次研究印度洋两个大洋中脊上的热液喷口之间的连通性。鳞毛藻的系统地理表明，SWIR和CIR喷口种群之间的连通性很低，这对未来管理该地区热液喷口海底采矿的环境影响有意义，正如龙旗所建议的那样。
Hydrothermal vents on mid-oceanic ridges are patchily distributed and host many taxa endemic to deep-sea chemosynthetic environments, whose dispersal may be constrained by geographical barriers. The aim of this study was to investigate the connectivity of three populations of the 'scaly-foot gastropod' (Chrysomallon squamiferum Chen et al., 2015), a species endemic to hydrothermal vents in the Indian Ocean, amongst two vent fields on the Central Indian Ridge (CIR) and Longqi field, the first sampled vent field on the Southwest Indian Ridge (SWIR). Connectivity and population structure across the two mid-oceanic ridges were investigated using a 489-bp fragment of the cytochrome oxidase c subunit I (COI) gene. Phylogeographical approaches used include measures of genetic differentiation (F (ST)), reconstruction of parsimony haplotype network, mismatch analyses and neutrality tests. Relative migrants per generation were estimated between the fields. Significant differentiation (F (ST) = 0.28-0.29, P < 0.001) was revealed between the vent field in SWIR and the two in CIR. Signatures were detected indicating recent bottleneck events followed by demographic expansion in all populations. Estimates of relative number of migrants were relatively low between the SWIR and CIR, compared with values between the CIR vent fields. The present study is the first to investigate connectivity between hydrothermal vents across two mid-ocean ridges in the Indian Ocean. The phylogeography revealed for C. squamiferum indicates low connectivity between SWIR and CIR vent populations, with implications for the future management of environmental impacts for seafloor mining at hydrothermal vents in the region, as proposed for Longqi.