Long-term effects of nutrient and CO2 enrichment on the temperate coral Astrangia poculata (Ellis and Solander, 1786)
Long-term effects of nutrient and CO2 enrichment on the temperate coral Astrangia poculata (Ellis and Solander, 1786)
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DOI：
10.1016/j.jembe.2010.02.007
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发表时间：
2010-04-30
影响因子：
2
通讯作者：
Cohen, Anne L.
中科院分区：
文献类型：
--
作者：
Holcomb, Michael;McCorkle, Daniel C.;Cohen, Anne L.
Zooxanthellate菌落的石珊瑚Astrangia poculata生长环境和升高的营养物质（5亩M NO3-，0.3亩M PO 4 -3，和2纳米Fe+2）和CO2（类似于780 ppmv）治疗的组合下，为期6个月。珊瑚钙化率，估计从浮力重量，没有显着影响适度升高的营养物质在环境中的CO2和环境中的营养水平的CO2升高的负面影响。然而，钙化的珊瑚饲养在高营养物结合升高的CO2并没有显着不同的珊瑚饲养在环境条件下，这表明CO2富集可以导致营养限制在zooxanthellate珊瑚。提出了一个概念模型来解释营养物质和二氧化碳如何相互作用，以控制虫黄藻珊瑚钙化。营养有限的珊瑚无法利用溶解无机碳（DIC）的增加，因为营养物质已经限制了生长，因此二氧化碳浓度升高对饱和状态的影响驱动了钙化反应。在营养物充足的条件下，珊瑚可能有能力利用更多的DIC，因此对CO2的钙化反应成为饱和状态的负面影响和总碳固定的正面影响的产物，这取决于哪一个占主导地位，钙化反应可以是正面的或负面的。这可能有助于解释如何在不同的海洋酸化研究中发现珊瑚的反应范围。(C)2010年爱思唯尔BM。All rights reserved.
Zooxanthellate colonies of the scleractinian coral Astrangia poculata were grown under combinations of ambient and elevated nutrients (5 mu M NO3-, 0.3 mu M PO4-3, and 2 nM Fe+2) and CO2 (similar to 780 ppmv) treatments for a period of 6 months. Coral calcification rates, estimated from buoyant weights, were not significantly affected by moderately elevated nutrients at ambient CO2 and were negatively affected by elevated CO2 at ambient nutrient levels. However, calcification by corals reared under elevated nutrients combined with elevated CO2 was not significantly different from that of corals reared under ambient conditions, suggesting that CO2 enrichment can lead to nutrient limitation in zooxanthellate corals. A conceptual model is proposed to explain how nutrients and CO2 interact to control zooxanthellate coral calcification. Nutrient limited corals are unable to utilize an increase in dissolved inorganic carbon (DIC) as nutrients are already limiting growth, thus the effect of elevated CO2 on saturation state drives the calcification response. Under nutrient replete conditions, corals may have the ability to utilize more DIC, thus the calcification response to CO2 becomes the product of a negative effect on saturation state and a positive effect on gross carbon fixation, depending upon which dominates, the calcification response can be either positive or negative. This may help explain how the range of coral responses found in different studies of ocean acidification can be obtained. (C) 2010 Elsevier BM. All rights reserved.