Characterization of a thermally tolerant Orbicella faveolata reef in Abaco, The Bahamas
Characterization of a thermally tolerant Orbicella faveolata reef in Abaco, The Bahamas
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巴哈马阿巴科耐热 Orbicella faveolata 礁石的特征
DOI：
10.1007/s00338-020-01948-0
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发表时间：
2020
期刊：
影响因子：
3.5
通讯作者：
Cunning, Ross
中科院分区：
文献类型：
--
作者：
Parker, Katherine E.;Ward, Jeremy O.;Eggleston, Erin M.;Fedorov, Evan;Parkinson, John Everett;Dahlgren, Craig P.;Cunning, Ross
人为气候变化导致海洋温度升高，导致珊瑚白化，珊瑚与光合鞭毛藻之间的共生关系破裂。然而，一些珊瑚在边缘、温暖的环境中茁壮成长，超过了典型的白化阈值。它们的生存可能是由珊瑚宿主内的特定基因介导的，与耐热藻类共生体和/或不同的细菌群落有关。在巴哈马大阿巴科的美人鱼礁，在达到33.0°C的变暖事件中，Orbicella faveolatacacoli没有漂白，而在沙礁（以南约18公里），只有32.0°C。faveolatableached广泛。为了研究导致美人鱼礁高耐热性的非生物和生物因素，我们比较了每个地点的温度、深度和珊瑚组成，并使用微卫星基因分型、定量PCR和16S rRNA元条形码分析了宿主基因型多样性、共生菌科组成和细菌群落。faveolata。紧密相联的。而在沙洲礁的菌落则包含了不同的基因型，并且寄生了不同比例的共生菌科四种属，这些属主要是由深度构成的。美人鱼礁的菌落也往往比沙礁有更高的细菌家族丰富度。这些发现表明，像美人鱼礁这样的浅而温暖的环境可能会选择少数假定的耐热基因型的珊瑚和共生体，尽管变暖可能会大大减少遗传多样性，但某些个体可能会茁壮成长。今天存在的这些个体可以为干预保护提供有价值的生物学见解和资源，旨在提高气候变化下的珊瑚礁恢复能力。
Increased ocean temperatures from anthropogenic climate change induce coral bleaching, the breakdown of symbioses between corals and photosynthetic dinoflagellates. However, some corals thrive in marginal, warm environments that exceed typical bleaching thresholds. Their survival may be mediated by specific genes within the coral host, association with heat-tolerant algal symbionts, and/or distinct bacterial communities. At Mermaid Reef in Great Abaco, The Bahamas,Orbicella faveolatacolonies did not bleach during a warming event that reached 33.0 °C, while at Sandy Cay Reef (~ 18 km south), which reached only 32.0 °C,O. faveolatableached extensively. To investigate abiotic and biotic factors contributing to Mermaid Reef’s higher thermal tolerance, we compared temperature, depth, and coral composition at each site and used microsatellite genotyping, quantitative PCR, and 16S rRNA metabarcoding to examine host genotype diversity, Symbiodiniaceae composition, and bacterial communities inO. faveolata. AllO. faveolatacolonies at the tolerant Mermaid Reef were clonemates and hosted exclusivelyDurusdiniumsymbionts, while colonies at Sandy Cay Reef comprised diverse genotypes and hosted varying proportions of four Symbiodiniaceae genera, which were primarily structured by depth. Mermaid Reef colonies also tended to have higher bacterial family richness than Sandy Cay Reef. These findings suggest that shallow, warm environments like Mermaid Reef may select for few, putatively heat-tolerant genotypes of corals and symbionts, and that while warming may greatly reduce genetic diversity, certain individuals may thrive. Such individuals existing today can provide valuable biological insights and resources for intervention conservation aimed at boosting reef resilience under climate change.
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