From endemism to widespread distribution: phylogeography of three amphidromous Sicyopterus species (Teleostei: Gobioidei: Sicydiinae)
From endemism to widespread distribution: phylogeography of three amphidromous Sicyopterus species (Teleostei: Gobioidei: Sicydiinae)
复制标题
DOI：
10.3354/meps09617
复制
发表时间：
2012-01-01
影响因子：
2.5
通讯作者：
Keith, P.
中科院分区：
文献类型：
--
作者：
Lord, C.;Lorion, J.;Keith, P.
岛屿淡水栖息地是由两栖鱼类，其中显示海洋幼虫阶段，而其生命周期的其余部分发生在河流中殖民。在本研究中，我们评估了广泛分布的兔头象甲（Gobioidei）在印度-太平洋分布范围内的种群结构，该分布范围包括被称为印度-太平洋屏障（IPB）的岛链（印度尼西亚-巴布亚新几内亚-马来西亚）。对2个特有种S. aiensis（Vanuatu）和S. sarasini（New Caledonia）与S.兔头蝠属是比较材料，被用作评估特有性和扩散的基础。获得了332 S的线粒体细胞色素B序列数据。lagocephalus，210 S. aiensis和87 S.每一个物种的分布范围。单倍型网络和F-统计被用来确定人口结构的模式。本文采用时间尺度合并树先验下的离散地理扩散模型，对S.在其广阔的空间分布。S.兔头猴在IPB中表现出较高的种群结构。它还显示了塔希提岛和所有其他采样地点之间的强大结构。在整个西太平洋没有发现其他的种群结构。系统发育重建和合并分析表明，最古老的人口起源于西太平洋，东太平洋和印度洋是殖民地。对于这2种特有种，在其各自的分布区中没有发现遗传结构。从与这些物种的生活史的已知元素相关的遗传结果，我们提高了我们的理解，同时存在的地理上接近的特有种和广泛分布的物种。
Island freshwater habitats are colonised by amphidromous fish, which display an oceanic larval phase while the rest of their life cycle takes place in rivers. In the present study we evaluated the population structure of the widespread Sicyopterus lagocephalus (Gobioidei) over its Indo-Pacific distribution range, which encompasses the island chain (Indonesia - Papua New Guinea - Malaysia) known as the Indo-Pacific Barrier (IPB). Additional analysis of 2 endemic species, S. aiensis (Vanuatu) and S. sarasini (New Caledonia), living in sympatry with S. lagocephalus, represented comparative material and was used as the basis for an assessment of endemism and dispersal. Mitochondrial cytochrome b sequence data were obtained for 332 S. lagocephalus, 210 S. aiensis and 87 S. sarasini across each species' range. Haplotype networks and F-statistics were used to determine patterns of population structure. A discrete phylogeographic diffusion model under a time-scaled coalescent tree prior was used to assess the history of the spatial expansion of S. lagocephalus across its wide spatial distribution. S. lagocephalus demonstrates high population structure across the IPB. It also displays a strong structure between Tahiti and all other locations sampled. No other population structure was identified in the entire western Pacific. Phylogenetic reconstruction and coalescence analysis indicate that the oldest population originated in the western Pacific, from which the eastern Pacific and the Indian Oceans were colonised. For the 2 endemic species, no genetic structure was identified across their respective ranges. From the genetic results associated with known elements of the life history of these species, we improved our understanding of the simultaneous existence of geographically close endemic species and a widespread species.