Census of heat tolerance among Florida's threatened staghorn corals finds resilient individuals throughout existing nursery populations
Census of heat tolerance among Florida's threatened staghorn corals finds resilient individuals throughout existing nursery populations
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DOI：
10.1098/rspb.2021.1613
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发表时间：
2021-10-27
影响因子：
4.7
通讯作者：
Baker, Andrew C.
中科院分区：
文献类型：
--
作者：
Cunning, Ross;Parker, Katherine E.;Baker, Andrew C.
由于海洋变暖，造礁珊瑚迅速消失，这推动了珊瑚繁殖和恢复、选择性繁殖和辅助基因流动等干预措施的发展。这些干预措施中有许多针对自然耐热的个体，以提高气候适应能力，但快速可靠地量化耐热性和识别耐热个体的挑战阻碍了实施。在这里，我们使用珊瑚漂白自动化的压力系统进行快速，标准化的耐热性测定229菌落鹿角珊瑚横跨六个珊瑚苗圃跨越佛罗里达的珊瑚礁，美国。对每个菌落的热应激剂量反应曲线的分析显示，个体之间的热耐受性范围很广（约为100%）。2.5在F-v/F-m ED 50中的摄氏度范围），在独立测试中具有高度可重复的排名（r = 0.76）。大多数表型变异发生在苗圃内，而不是它们之间，指向一个潜在的主导作用，固定的遗传效应，在设置耐热性和广泛分布的宽容的个人在整个人口。宽容的个人的识别提供了立即可操作的信息，以优化苗圃和恢复方案的佛罗里达的受威胁的鹿角珊瑚。这项工作进一步提供了一个蓝图，为今后的努力，以确定和源耐热珊瑚的保护措施在世界各地。
The rapid loss of reef-building corals owing to ocean warming is driving the development of interventions such as coral propagation and restoration, selective breeding and assisted gene flow. Many of these interventions target naturally heat-tolerant individuals to boost climate resilience, but the challenges of quickly and reliably quantifying heat tolerance and identifying thermotolerant individuals have hampered implementation. Here, we used coral bleaching automated stress systems to perform rapid, standardized heat tolerance assays on 229 colonies of Acropora cervicornis across six coral nurseries spanning Florida's Coral Reef, USA. Analysis of heat stress dose-response curves for each colony revealed a broad range in thermal tolerance among individuals (approx. 2.5 degrees C range in F-v/F-m ED50), with highly reproducible rankings across independent tests (r = 0.76). Most phenotypic variation occurred within nurseries rather than between them, pointing to a potentially dominant role of fixed genetic effects in setting thermal tolerance and widespread distribution of tolerant individuals throughout the population. The identification of tolerant individuals provides immediately actionable information to optimize nursery and restoration programmes for Florida's threatened staghorn corals. This work further provides a blueprint for future efforts to identify and source thermally tolerant corals for conservation interventions worldwide.