Symbiont community diversity is more variable in corals that respond poorly to stress
Symbiont community diversity is more variable in corals that respond poorly to stress
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DOI：
10.1111/gcb.14999
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发表时间：
2020-02-12
影响因子：
11.6
通讯作者：
Correa, Adrienne M. S.
中科院分区：
文献类型：
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作者：
Howe-Kerr, Lauren I.;Bachelot, Benedicte;Correa, Adrienne M. S.
随着气候变化和当地水质新闻环境条件，珊瑚礁在全球范围内下降，超出了宿主及其微生物共生体的集体的生理公差。为了评估共生体组成与Holobiont胁迫耐受性之间的关系，对鞭毛藻内共生菌（家族：共生菌科）进行了量化社区多样性指标，从八个Acropora millepora基因下，这些基因在或对各种胁迫下的繁荣或反应不佳。这八个选定的基因代表了40个珊瑚基因的响应分布的上和下尾，这些基因在10天的实验中暴露于四种应力处理（和对照条件）。具体而言，在实验结束时分析了四个“表现最好的”珊瑚基因，因为它们在高温，高PCO（2），细菌暴露或组合压力源中存活，而在这些压力源下经历了大量的死亡率，而四个“最差的绩效”基因的特征。在实验结束时，八个珊瑚基因中有七个主要托管了邻苯国共生膜，而第八个基因则由cladocopium和durusdinium symbionts主导。在表现最差的基因中，共生性α和β多样性高于最佳性能基因。与表现最好的人相比，在压力暴露相对于其对照方面，与对照相比，在压力暴露相对于其对照方面的相对于其对照组的比例差异，与表现最差的人相比，与表现最差的共生体社区相比，与表现最好的人相比，差异更大。广义的联合属性模型估计了宿主基因和治疗对共生菌科群落组成的影响，并确定了特定共生体和宿主基因性能之间的牢固关联，以及与治疗的较弱关联。尽管占主导地位的共生生理学和功能有助于宿主表现，但这些发现强调了共生社区多样性和随机性作为宿主绩效的组成部分的重要性。我们的发现还表明，共生社区多样性指标可能是弹性的指标，并在从气候变化适应农业和医学的各种学科中具有潜在的应用。
Coral reefs are declining globally as climate change and local water quality press environmental conditions beyond the physiological tolerances of holobionts-the collective of the host and its microbial symbionts. To assess the relationship between symbiont composition and holobiont stress tolerance, community diversity metrics were quantified for dinoflagellate endosymbionts (Family: Symbiodiniaceae) from eight Acropora millepora genets that thrived under or responded poorly to various stressors. These eight selected genets represent the upper and lower tails of the response distribution of 40 coral genets that were exposed to four stress treatments (and control conditions) in a 10-day experiment. Specifically, four 'best performer' coral genets were analyzed at the end of the experiment because they survived high temperature, high pCO(2), bacterial exposure, or combined stressors, whereas four 'worst performer' genets were characterized because they experienced substantial mortality under these stressors. At the end of the experiment, seven of eight coral genets mainly hosted Cladocopium symbionts, whereas the eighth genet was dominated by both Cladocopium and Durusdinium symbionts. Symbiodiniaceae alpha and beta diversity were higher in worst performing genets than in best performing genets. Symbiont communities in worst performers also differed more after stress exposure relative to their controls (based on normalized proportional differences in beta diversity), than did best performers. A generalized joint attribute model estimated the influence of host genet and treatment on Symbiodiniaceae community composition and identified strong associations among particular symbionts and host genet performance, as well as weaker associations with treatment. Although dominant symbiont physiology and function contribute to host performance, these findings emphasize the importance of symbiont community diversity and stochasticity as components of host performance. Our findings also suggest that symbiont community diversity metrics may function as indicators of resilience and have potential applications in diverse disciplines from climate change adaptation to agriculture and medicine.