High heritability of coral calcification rates and evolutionary potential under ocean acidification
High heritability of coral calcification rates and evolutionary potential under ocean acidification
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DOI：
10.1038/s41598-019-56313-1
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发表时间：
2019-12-31
影响因子：
4.6
通讯作者：
Toonen, Robert J.
中科院分区：
文献类型：
--
作者：
Jury, Christopher P.;Delano, Mia N.;Toonen, Robert J.
对遗传力的估计为进化潜力和许多管理行动的可能结果提供了信息，但对海洋生物的这种估计仍然很少。在这里，我们报告了在模拟未来海洋条件的pH值降低的情况下，八种最主要的夏威夷珊瑚物种的钙化率具有高遗传性。珊瑚群落从整个夏威夷的海水化学中的天然镶嵌体中的多达六个位置取样，并在环境和高pCO（2）条件下分成克隆复制品。广义遗传力的钙化率是高的，在所有8个物种中，从最低的0.32，在Porites evermanni高的0.61，在Porites compressa。总体结果与短期适应当地环境或适应平均或理想条件不一致。同样，在“本地与外国”和“本地与外地”的测试中，没有明显的本地适应特征。相反，数据是最一致的保护多态性的机制，保持不同的pH值耐受性的人口。大量的个体变异，加上高遗传性和庞大的种群规模，意味着自然选择和适应能力的巨大空间，这对珊瑚的进化潜力和应对气候变化的管理具有重大影响。
Estimates of heritability inform evolutionary potential and the likely outcome of many management actions, but such estimates remain scarce for marine organisms. Here, we report high heritability of calcification rate among the eight most dominant Hawaiian coral species under reduced pH simulating future ocean conditions. Coral colonies were sampled from up to six locations across a natural mosaic in seawater chemistry throughout Hawai'i and fragmented into clonal replicates maintained under both ambient and high pCO(2) conditions. Broad sense heritability of calcification rates was high among all eight species, ranging from a low of 0.32 in Porites evermanni to a high of 0.61 in Porites compressa. The overall results were inconsistent with short-term acclimatization to the local environment or adaptation to the mean or ideal conditions. Similarly, in 'local vs. foreign' and 'home vs. away' tests there was no clear signature of local adaptation. Instead, the data are most consistent with a protected polymorphism as the mechanism which maintains differential pH tolerance within the populations. Substantial individual variation, coupled with high heritability and large population sizes, imply considerable scope for natural selection and adaptive capacity, which has major implications for evolutionary potential and management of corals in response to climate change.