The Effects of Temperature, Light, and Feeding on the Physiology of Pocillopora damicornis, Stylophora pistillata, and Turbinaria reniformis Corals
The Effects of Temperature, Light, and Feeding on the Physiology of Pocillopora damicornis, Stylophora pistillata, and Turbinaria reniformis Corals
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DOI：
10.3390/w13152048
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发表时间：
2021-08-01
期刊：
影响因子：
3.4
通讯作者：
Grottoli, Andrea G.
中科院分区：
文献类型：
--
作者：
Dobson, Kerri L.;Ferrier-Pages, Christine;Grottoli, Andrea G.
有证据表明，单独喂食或减少光照可以减轻温度升高对珊瑚生理的负面影响。我们的目的是评估同时低光和喂养是否会减轻，最大限度地减少或加剧高温对珊瑚生理和碳预算的负面影响。在两种海水温度条件下，对Damicornis、Stylophora pistillata和Turbinaria reniformis进行了为期28天的全因子试验（环境温度25摄氏度，高温30摄氏度），两种光照水平（300 μ mol光子m（-2）s（-1）的高光照，150 μ mol光子m（-2）s（-1）的低光照），以及喂食（卤虫无节幼体）或不喂食。珊瑚的生理学在所有物种中都受到温度的显着影响，但低光和摄食改变其生理反应的方式是物种特异性的。三种植物均通过增加叶绿素a来适应弱光。Pocillopora damicornis需要喂养，以满足代谢的需求，无论温度，但无法维持低光下的钙化时喂养。于T.低光缓解了温度升高对总脂的负面影响，而摄食缓解了温度升高对代谢需求的负面影响。In S. pistillata，低光加剧了升高的温度对代谢需求的负面影响，而喂养最大限度地减少了这种负面影响，但不足以提供100%的代谢需求。总体而言，低光和摄食并没有协同作用，也没有加和作用，以减轻高温对红腹拟步行虫，S。pistillata，或T.肾形肌然而，单独喂养是至关重要的维持代谢需求在高温下，这表明，足够的异养食物来源的供应可能是必不可少的珊瑚在热应力（漂白）事件。
Evidence has shown that individually feeding or reduced light can mitigate the negative effects of elevated temperature on coral physiology. We aimed to evaluate if simultaneous low light and feeding would mitigate, minimize, or exacerbate negative effects of elevated temperature on coral physiology and carbon budgets. Pocillopora damicornis, Stylophora pistillata, and Turbinaria reniformis were grown for 28 days under a fully factorial experiment including two seawater temperatures (ambient temperature of 25 degrees C, elevated temperature of 30 degrees C), two light levels (high light of 300 mu mol photons m(-2) s(-1), low light of 150 mu mol photons m(-2) s(-1)), and either fed (Artemia nauplii) or unfed. Coral physiology was significantly affected by temperature in all species, but the way in which low light and feeding altered their physiological responses was species-specific. All three species photo-acclimated to low light by increasing chlorophyll a. Pocillopora damicornis required feeding to meet metabolic demand irrespective of temperature but was unable to maintain calcification under low light when fed. In T. reniformis, low light mitigated the negative effect of elevated temperature on total lipids, while feeding mitigated the negative effects of elevated temperature on metabolic demand. In S. pistillata, low light compounded the negative effects of elevated temperature on metabolic demand, while feeding minimized this negative effect but was not sufficient to provide 100% metabolic demand. Overall, low light and feeding did not act synergistically, nor additively, to mitigate the negative effects of elevated temperature on P. damicornis, S. pistillata, or T. reniformis. However, feeding alone was critical to the maintenance of metabolic demand at elevated temperature, suggesting that sufficient supply of heterotrophic food sources is likely essential for corals during thermal stress (bleaching) events.