Moderate nutrient concentrations are not detrimental to corals under future ocean conditions
Moderate nutrient concentrations are not detrimental to corals under future ocean conditions
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DOI：
10.1007/s00227-021-03901-3
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发表时间：
2021-07-01
期刊：
影响因子：
2.4
通讯作者：
Grottoli, Andrea G.
中科院分区：
文献类型：
--
作者：
Dobson, Kerri L.;Levas, Stephen;Grottoli, Andrea G.
在预测的未来海洋条件下，暴露在营养物质升高的珊瑚礁将同时经历海洋酸化和温度上升。我们评估了适度的营养物质是否缓解、最小化或加剧了预测的未来海洋条件对珊瑚生理的负面影响。在30天的时间里，采用了8个处理的完全析因试验，包括两种海水温度(26.4℃和29.8℃)、PCO(2)水平(401亩常压PCO(2)和760亩常压PCO(2))、营养浓度(环境：0.40mmoL L-1NO3-和0.22mmolL-1PO43-，中等浓度：3.56mmolL-1NO3-和0.31mUmolL-1PO43-)。在这两个物种中，添加的硝酸盐都被藻类内共生体吸收并转移到珊瑚宿主中，但在千粒藻中转移的程度要高得多。当暴露在高温、PCO(2，)升高或两者兼而有之时，所观察到的对叶绿素a、钙化、生物量和能量储备的影响不会因两种植物的中等营养浓度而变得复杂。在预测的未来海洋条件下，适中的营养物质使千孢子藻能够继续通过光合作用满足日常代谢需求，而肾形螺旋藻则通过光合作用和异养作用大大超过每日代谢需求。我们的结果表明，在预测的未来海洋条件下，平衡的适度营养对珊瑚无害，甚至可能提供一些好处。
Under predicted future ocean conditions, reefs exposed to elevated nutrients will simultaneously experience ocean acidification and elevated temperature. We evaluated if moderate nutrients mitigate, minimize, or exacerbate negative effects of predicted future ocean conditions on coral physiology. For 30 days, Acropora millepora and Turbinaria reniformis were exposed to a fully factorial experiment of eight treatments including two seawater temperatures (26.4 degrees C and 29.8 degrees C), pCO(2) levels (401 mu atm pCO(2) and 760 mu atm pCO(2)), and nutrient concentrations (ambient: 0.40 mu mol L-1 NO3- and 0.22 mu mol L-1 PO43-, and moderate: 3.56 mu mol L-1 NO3- and 0.31 mu mol L-1 PO43-). Added nitrate was taken up by the algal endosymbionts and transferred to the coral hosts in both species, though to a much higher degree in A. millepora. When exposed to elevated temperature, elevated pCO(2,) or both, effects observed for chlorophyll a, calcification, biomass, and energy reserves were not compounded by the moderate nutrient concentrations in either species. Moderate nutrients enabled A. millepora to continue to meet daily metabolic demand via photosynthesis under predicted future ocean conditions and T. reniformis to greatly exceed daily metabolic demand via photosynthesis and heterotrophy. Our results suggest that balanced moderate nutrients are not detrimental to corals under predicted future ocean conditions and may even provide some benefits.