Plasticity of symbiont acquisition in new recruits of the massive coral Platygyra daedalea under ocean warming and acidification
Plasticity of symbiont acquisition in new recruits of the massive coral Platygyra daedalea under ocean warming and acidification
复制标题
海洋变暖和酸化下大型珊瑚 Platygyra daedalea 新成员获得共生体的可塑性
DOI：
10.1007/s00338-021-02151-5
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发表时间：
2021-07
期刊：
影响因子：
3.5
通讯作者：
Hui Huang
中科院分区：
文献类型：
--
作者：
Lei Jiang;Guowei Zhou;Yuyang Zhang;Tao Yuan;Xinming Lei;Minglan Guo;Xiangcheng Yuan;Jiansheng Lian;Sheng Liu;Hui Huang
共生体的建立是大多数广播产卵珊瑚生命周期中的一个里程碑;然而，最初的共生体感染如何受到海洋变暖和酸化的影响，特别是对于大规模珊瑚，仍然是未知的。这项研究调查了高温（29与31 °C）和pCO 2（~ 450与~ 1000 μatm）对广泛分布的大型珊瑚Platygyra daedalea招募的综合影响。结果表明，几何直径和共生建立不受高pCO 2，而升高的温度显着减少成功的共生体感染的50%，并推迟了6%的几何直径。虽然没有增加的温度，二氧化碳分压，也没有他们的相互作用影响的生存或藻类色素沉着的新兵，有共生体感染率和生存率之间的反比关系，特别是在高温下，可能是由于氧化应激引起的藻类共生体温度升高。有趣的是，在31 °C的新兵中Durusdinium的比例没有增加，而在高pCO 2下饲养的新兵拥有更少的Breviolum和更多的Durusdinium，这表明早期共生的高度可塑性，并与先前的发现形成对比，即热应激通常导致珊瑚新兵中耐热Durusdinium的流行。这些结果表明，海洋变暖可能比海洋酸化对P. daedalea的早期成功更为有害，并为我们了解未来气候条件下的珊瑚-藻类共生伙伴关系提供了见解。
Symbiosis establishment is a milestone in the life cycles of most broadcast-spawning corals; however, it remains largely unknown how initial symbiont infection is affected by ocean warming and acidification, particularly for massive corals. This study investigated the combined effects of elevated temperature (29 vs. 31 °C) and pCO2 (~ 450 vs. ~ 1000 μatm) on the recruits of a widespread massive coral, Platygyra daedalea. Results showed that geometric diameter and symbiosis establishment were unaffected by high pCO2, while elevated temperature significantly reduced successful symbiont infection by 50% and retarded the geometric diameter by 6%. Although neither increased temperature, pCO2, nor their interaction affected survival or algal pigmentation of recruits, there was an inverse relationship between symbiont infection rates and survivorship, especially at high temperatures, possibly as a result of oxidative stress caused by algal symbionts under increased temperature. Intriguingly, the proportion of Durusdinium did not increase in recruits at 31 °C, while recruits reared under high pCO2 hosted less Breviolum and more Durusdinium, indicating a high degree of plasticity of early symbiosis and contrasting to the previous finding that heat stress usually leads to the prevalence of thermally tolerant Durusdinium in coral recruits. These results suggest that ocean warming is likely to be more deleterious for the early success of P. daedalea than ocean acidification and provide insights into our understanding of coral-algal symbiotic partnerships under future climatic conditions.
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