Natural Variability in Caribbean Coral Physiology and Implications for Coral Bleaching Resilience
Natural Variability in Caribbean Coral Physiology and Implications for Coral Bleaching Resilience
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DOI：
10.3389/fmars.2021.811055
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发表时间：
2022-01-13
影响因子：
3.7
通讯作者：
Grottoli, Andrea G.
中科院分区：
文献类型：
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作者：
Chapron, Leila;Schoepf, Verena;Grottoli, Andrea G.
珊瑚礁是世界上最多样化和最复杂的生态系统之一，提供重要的生态和经济服务。与全球气候变化相关的海面温度升高会导致珊瑚白化，从而威胁到这些生态系统。然而，尚不完全清楚自然的年内或年际生理变异是否与珊瑚的白化恢复能力或恢复能力有关。在2年多的时间里，通过测量钙化、生物量、脂质、蛋白质、碳水化合物、叶绿素a、藻类内共生密度、宿主和内共生藻类的稳定碳同位素以及骨骼的稳定碳氧同位素，对加勒比海3种常见物种（Porites divaricata、Porites astreoides、Orbicella faveolata）的珊瑚生理进行了监测。这三种珊瑚的整体生理特征随时间的变化而变化，而P. divaricata的生理特征始终不同于其他两种珊瑚。相较于星形孢子和黄豆孢子，异养孢子具有更高的能量储备和对寄主组织的异养碳贡献。持续较高的总能量储备和对组织的异养贡献似乎缓冲了环境压力，包括漂白事件。因此，珊瑚物种之间的自然生理变异似乎比珊瑚物种内部或年际的生理变异更能预测珊瑚的白化恢复能力。
Coral reefs are among the most diverse and complex ecosystems in the world that provide important ecological and economical services. Increases in sea surface temperature linked to global climate change threatens these ecosystems by inducing coral bleaching. However, it is not fully known if natural intra- or inter-annual physiological variability is linked to bleaching resilience or recovery capacity of corals. Here, we monitored the coral physiology of three common Caribbean species (Porites divaricata, Porites astreoides, Orbicella faveolata) at six time points over 2 years by measuring the following traits: calcification, biomass, lipids, proteins, carbohydrates, chlorophyll a, algal endosymbiont density, stable carbon isotopes of the host and endosymbiotic algae, and the stable carbon and oxygen isotopes of the skeleton. The overall physiological profile of all three species varied over time and that of P. divaricata was consistently different from the two other coral species. Porites divaricata had higher energy reserves coupled with higher contributions of heterotrophically derived carbon to host tissues than both P. astreoides and O. faveolata. Consistently higher overall energy reserves and heterotrophic contributions to tissues appear to buffer against environmental stress, including bleaching events. Thus, natural physiological variability among coral species appears to be a stronger predictor of coral bleaching resilience than intra- or inter-annual physiological variability within a coral species.