Genetic evidence of peripheral isolation and low diversity in marginal populations of the Acropora hyacinthus complex
Genetic evidence of peripheral isolation and low diversity in marginal populations of the Acropora hyacinthus complex
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卫城风信子复合体边缘种群外围隔离和低多样性的遗传证据
DOI：
10.1007/s00338-016-1484-2
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发表时间：
2016
期刊：
影响因子：
3.5
通讯作者：
Fukami Hironobu
中科院分区：
文献类型：
--
作者：
Suzuki Go;Keshavmurthy Shashank;Hayashibara Takeshi;Wallace Carden C.;Shirayama Yoshihisa;Chen Chaolun Allen;Fukami Hironobu
虫黄藻珊瑚遍布整个热带地区，但由于温暖洋流的存在，也延伸到亚热带和边缘地区。边缘地区珊瑚的种群历史与不断变化的全球气候条件密切相关，因为物种边缘区域可能在进化创新中发挥重要作用。在这里，我们研究了台湾和日本黑潮沿岸从热带到高亚热带地区广泛分布的珊瑚物种复合体 Acroporahyacinthus 的遗传结构。对来自 18 个地点（7 个珊瑚礁和 11 个边缘）的 307 个样本进行群体遗传分析，确定了 A 中至少有 4 个遗传谱系。 hyacinthuscomplex：HyaA、HyaB、HyaC（主要珊瑚礁位置）和 HyaD 在日本大陆和台湾的边缘位置占主导地位，但上澎湖群岛除外，后者以 HyaC 为主。杂交实验表明来自珊瑚礁位置的 HyaC 和 D 之间存在半不亲和性和杂交，这意味着杂交伙伴的存在增强了多样化和遗传多样性。在黑潮不断流过的琉球群岛的两个海峡沿岸，发现了 HyaC 和 HyaD 统治区之间不完整的屏障。尽管地理距离较远，但日本大陆人口的遗传组成与台湾大陆相当，这可能反映了 A. 北界周围特定区域的连通性。太平洋的风信子。相比之下，琉球群岛的人口与帕劳和大堡礁的人口没有显着差异。虽然在黑潮洋流周围发现的谱系的精确分类性质仍有待阐明，但这些结果表明，尽管黑潮三角区存在四个谱系，但两条主线的低遗传多样性种群可能在边缘地区分离和分化。
Zooxanthellate corals are found throughout the tropics, but also extend into subtropical and marginal locations due to the presence of warm ocean currents. The population history of corals in marginal locations is of great interest in relation to changing global climatic conditions, as species edge zones might play an important role in evolutionary innovation. Here, we examine the genetic structure of a widely distributed coral species complex,Acroporahyacinthus, from tropical to high subtropical regions along the Kuroshio Current in Taiwan and Japan. Population genetic analysis of 307 specimens from 18 locations (7 reefal and 11 marginal) identified at least four genetic lineages within theA. hyacinthuscomplex: HyaA, HyaB, HyaC (dominating reefal locations) and HyaD dominating marginal locations in mainland Japan and Taiwan, except the upper Penghu Islands, which were dominated by HyaC. Crossing experiments suggested semi-incompatibility and hybridization between HyaC and D from reefal locations, implying that the existence of hybridization partners enhances diversification and genetic diversity. An incomplete barrier between the HyaC and HyaD dominations was found along the two straits in the Ryukyu Islands, where Kuroshio Current flows constantly. Despite geographical distance, the genetic composition of populations in mainland Japan was comparable to that in mainland Taiwan, which may reflect a region-specific connectivity around the northern limit ofA. hyacinthusin the Pacific. In contrast, populations in the Ryukyu Islands were not significantly different from those of Palau and the Great Barrier Reef. While the precise taxonomic nature of the lineages found around the Kuroshio Current remains to be elucidated, these results indicate that, despite the presence of four lineages in the Kuroshio triangle, low genetic diversity populations of the two main lines might be isolating and differentiating in the marginal region.