Short-term metabolic and growth responses of the cold-water coral Lophelia pertusa to ocean acidification
Short-term metabolic and growth responses of the cold-water coral Lophelia pertusa to ocean acidification
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DOI：
10.1016/j.dsr2.2013.07.005
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发表时间：
2014-01-01
影响因子：
3
通讯作者：
Roberts, J. M.
中科院分区：
文献类型：
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作者：
Hennige, S. J.;Wicks, L. C.;Roberts, J. M.
冷水珊瑚与当地高度的生物多样性有关，但尽管它们作为生态系统工程师的重要性，人们对这些生物如何应对预计的海洋酸化知之甚少。自工业化前以来，海洋的平均pH值已从8.2降至8.1，预计到本世纪末，二氧化碳排放量将再减少0.3个pH单位。这种pH值的下降可能对海洋生物产生广泛的影响，特别是对冷水珊瑚等钙化物的影响。鹦鹉螺（Lophelia pertusa）是分布最广的冷水珊瑚（CWC）物种，经常在北大西洋发现。在这里，我们提供了第一个短期（21天）的数据，关于增加二氧化碳（750ppm）对从苏格兰明古雷珊瑚礁复杂群落新采集的L pertusa代谢的影响，并与净钙化进行了比较。在21天内，暴露于增加CO2条件下的珊瑚的呼吸速率（11.4 +/- 1.39 SE, gmol o - 2g（-1）组织干重h(-1)）显著低于对照组（28.6 +/- 7.30 SE mu mol o - 2g（-1）组织干重h(-1)）。使用碱度异常技术和C-14摄取测量的钙化率在处理之间没有相应的变化。呼吸速率的降低和钙化速率的维持表明能量失衡，可能是由脂质储备的利用促进的。从明古莱珊瑚礁群新收集的这些数据将有助于确定海洋酸化对这一关键珊瑚礁框架形成物种的生长、生理和结构完整性的影响。(C) 2013 Elsevier Ltd.版权所有。
Cold-water corals are associated with high local biodiversity, but despite their importance as ecosystem engineers, little is known about how these organisms will respond to projected ocean acidification. Since preindustrial times, average ocean pH has decreased from 8.2 to similar to 8.1, and predicted CO2 emissions will decrease by up to another 0.3 pH units by the end of the century. This decrease in pH may have a wide range of impacts upon marine life, and in particular upon calcifiers such as cold-water corals. Lophelia pertusa is the most widespread cold-water coral (CWC) species, frequently found in the North Atlantic. Here, we present the first short-term (21 days) data on the effects of increased CO2 (750 ppm) upon the metabolism of freshly collected L pertusa from Mingulay Reef Complex, Scotland, for comparison with net calcification. Over 21 days, corals exposed to increased CO2 conditions had significantly lower respiration rates (11.4 +/- 1.39 SE, gmol O-2 g(-1) tissue dry weight h(-1)) than corals in control conditions (28.6 +/- 7.30 SE mu mol O-2 g(-1) tissue dry weight h(-1)). There was no corresponding change in calcification rates between treatments, measured using the alkalinity anomaly technique and C-14 uptake. The decrease in respiration rate and maintenance of calcification rate indicates an energetic imbalance, likely facilitated by utilisation of lipid reserves. These data from freshly collected L pertusa from the Mingulay Reef Complex will help define the impact of ocean acidification upon the growth, physiology and structural integrity of this key reef framework forming species. (C) 2013 Elsevier Ltd. All rights reserved.