Long-range dispersal and high-latitude environments influence the population structure of a "stress-tolerant" dinoflagellate endosymbiont.
Long-range dispersal and high-latitude environments influence the population structure of a "stress-tolerant" dinoflagellate endosymbiont.
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DOI：
10.1371/journal.pone.0079208
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Lajeunesse TC
中科院分区：
文献类型：
--
作者：
Pettay DT;Lajeunesse TC
耐胁迫共生甲藻（属共生藻）的迁移和扩散可能会影响共生造礁珊瑚对气候变暖的反应。我们分析了遗传结构的耐应力的内共生体，共生藻glynni nomen nudum（ITS 2- D1），从Pocillopora殖民地，占主导地位的东太平洋珊瑚群落。11个微卫星位点确定了整个东热带太平洋地区具有最小遗传细分的基因型多样性人群，包括从墨西哥大陆到加拉帕戈斯群岛的1000平方公里。在这些距离的人口分化的缺乏对应于广泛的区域主机连接，并表明Pocillopora幼虫，母系继承他们的共生体，帮助分散这种共生体。然而，与其宿主相反，亚热带种群的S。加州湾（科尔特斯海）的格林尼与热带东太平洋的种群有很强的分化。选择压力与温度和辐照度的季节性波动有关，这可能解释了这种突然的遗传不连续性。我们推断S.来自更南方的宿主幼虫所携带的Glynni基因型迅速被适应更温和环境的基因型所取代。S. Glynni对应于波动的环境条件并表明这些遗传多样性种群具有迅速进化以适应变化的环境的潜力并揭示了环境极端在驱动微生物真核生物中的重要性（例如，海洋生态系统中的物种形成。
The migration and dispersal of stress-tolerant symbiotic dinoflagellates (genus Symbiodinium) may influence the response of symbiotic reef-building corals to a warming climate. We analyzed the genetic structure of the stress-tolerant endosymbiont, Symbiodinium glynni nomen nudum (ITS2 - D1), obtained from Pocillopora colonies that dominate eastern Pacific coral communities. Eleven microsatellite loci identified genotypically diverse populations with minimal genetic subdivision throughout the Eastern Tropical Pacific, encompassing 1000’s of square kilometers from mainland Mexico to the Galapagos Islands. The lack of population differentiation over these distances corresponds with extensive regional host connectivity and indicates that Pocillopora larvae, which maternally inherit their symbionts, aid in the dispersal of this symbiont. In contrast to its host, however, subtropical populations of S. glynni in the Gulf of California (Sea of Cortez) were strongly differentiated from populations in tropical eastern Pacific. Selection pressures related to large seasonal fluctuations in temperature and irradiance likely explain this abrupt genetic discontinuity. We infer that S. glynni genotypes harbored by host larvae arriving from more southern locations are rapidly replaced by genotypes adapted to more temperate environments. The strong population structure of S. glynni corresponds with fluctuating environmental conditions and suggests that these genetically diverse populations have the potential to evolve rapidly to changing environments and reveals the importance of environmental extremes in driving microbial eukaryote (e.g., plankton) speciation in marine ecosystems.
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DOI：
10.1073/pnas.1001380107
发表时间：
2010-07-20
影响因子：
11.1
作者：
Casteleyn, Griet;Leliaert, Frederik;Vyverman, Wim
通讯作者：
Vyverman, Wim
影响因子：
1.6
作者：
Hirose, M;Kinzie, RA;Hidaka, M
通讯作者：
Hidaka, M
影响因子：
56.9
作者：
Finlay, BJ
通讯作者：
Finlay, BJ
影响因子：
2.4
作者：
GLYNN, PW;GASSMAN, NJ;GUZMAN, HM
通讯作者：
GUZMAN, HM
影响因子：
4.9
作者：
Frade, P. R.;De Jongh, F.;Bak, R. P. M.
通讯作者：
Bak, R. P. M.