Identity and diversity of coral endosymbionts (zooxanthellae) from three Palauan reefs with contrasting bleaching, temperature and shading histories
Identity and diversity of coral endosymbionts (zooxanthellae) from three Palauan reefs with contrasting bleaching, temperature and shading histories
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DOI：
10.1111/j.1365-294x.2004.02230.x
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发表时间：
2004-08-01
影响因子：
4.9
通讯作者：
Van Oppen, MJH
中科院分区：
文献类型：
--
作者：
Fabricius, KE;Mieog, JC;Van Oppen, MJH
珊瑚与更耐温的藻类（虫黄藻，共生藻）的潜力可能对全球气候变化时代珊瑚礁的未来产生重要影响。在这项研究中，在三个珊瑚礁的遗传特性和多样性的虫黄藻进行了调查，对比历史的漂白死亡率，水温和阴影，在帕劳共和国（密克罗尼西亚）。单链构象多态性和核糖体DNA内转录间隔区（ITS）1区的序列分析用于基因分型。一个长期温暖，但部分阴影的珊瑚礁在海洋湖泊，水文以及连接到周围的沃茨窝藏只有两个单链构象多态性配置文件（即zooxanthella社区）。在所有13个nonporitid种和2个Porites种中，它仅由共生甲藻D组成，其余5个Porites含有C。尽管该湖的温度很高（高于环境温度0.5度），但在1998年的漂白事件中，该珊瑚礁并没有受到珊瑚死亡的影响，然而，在珊瑚群落中没有出现对漂白敏感的珊瑚科和属。这种设置与其他两个珊瑚礁，一般较低的温度，其中10和12 zooxanthella社区与中到低比例的分支D zooxanthanum被发现。数据表明，整个珊瑚组合，当生长在海水温度升高，在减少辐照度，可以由殖民地与更耐热的分支D zooxanthanum。因此，未来海水温度的升高可能会导致共生藻D型在石珊瑚中的流行率增加，这可能与虫黄藻和珊瑚的多样性丧失有关。
The potential of corals to associate with more temperature-tolerant strains of algae (zooxanthellae, Symbiodinium) can have important implications for the future of coral reefs in an era of global climate change. In this study, the genetic identity and diversity of zooxanthellae was investigated at three reefs with contrasting histories of bleaching mortality, water temperature and shading, in the Republic of Palau (Micronesia). Single-stranded conformation polymorphism and sequence analysis of the ribosomal DNA internal transcribed spacer (ITS)1 region was used for genotyping. A chronically warm but partly shaded coral reef in a marine lake that is hydrographically well connected to the surrounding waters harboured only two single-stranded conformation polymorphism profiles (i.e. zooxanthella communities). It consisted only of Symbiodinium D in all 13 nonporitid species and two Porites species investigated, with the remaining five Porites harbouring C.. Despite the high temperature in this lake (> 0.5degrees above ambient), this reef did not suffer coral mortality during the (1998) bleaching event, however, no bleaching-sensitive coral families and genera occur in the coral community. This setting contrasts strongly with two other reefs with generally lower temperatures, in which 10 and 12 zooxanthella communities with moderate to low proportions of clade D zooxanthellae were found. The data indicate that whole coral assemblages, when growing in elevated seawater temperatures and at reduced irradiance, can be composed of colonies associated with the more thermo-tolerant clade D zooxanthellae. Future increases in seawater temperature might, therefore, result in an increasing prevalence of Symbiodinium phylotype D in scleractinian corals, possibly associated with a loss of diversity in both zooxanthellae and corals.