The physiological response of the deep-sea coral Solenosmilia variabilis to ocean acidification
The physiological response of the deep-sea coral Solenosmilia variabilis to ocean acidification
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DOI：
10.7717/peerj.5236
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发表时间：
2018-07-20
期刊：
影响因子：
2.7
通讯作者：
Davy, Simon K.
中科院分区：
文献类型：
--
作者：
Gammon, Malindi J.;Tracey, Dianne M.;Davy, Simon K.
几种钙化硬核珊瑚在深海中提供了重要的栖息地复杂性，并始终与鱼类和其他无脊椎动物的高度生物多样性有关。这些珊瑚如何应对未来预测的海洋酸化环境条件尚不清楚，但对这些海洋钙化剂的任何有害影响都会对生态系统产生更广泛的影响。2014年3月，科学家在路易斯维尔海山链的一次巡航中收集了一种受保护的深海珊瑚，这种珊瑚常见于新西兰地区。在12个月的时间里，样品被保存在温度控制（类似于3.5摄氏度）的连续流过的水箱中，海水pH值反映了该地区当前的条件（7.88）和世纪末的情况（7.65）。对珊瑚生长的影响和颜色饱和度（作为覆盖珊瑚外骨骼和连接珊瑚珊瑚虫的协叶组织的代表）每两个月测量一次。此外，在中期（6个月）和长期（12个月）暴露期后测量呼吸速率。生长速率变化很大，从0.53到3.068 mm /年（-1）不等，处理和对照菌落之间没有明显差异。呼吸速率也独立于pH值变化，范围为0.065至1.756 μ mol o - 2g蛋白（-1）h（-1）。随着时间的推移，观察到治疗组的颜色发生了显著变化，表明协酶的丧失。10个月后损失最大，为5.28%，这可能表明能量的重新分配，以牺牲协酶产生为代价维持生理过程（如生长和呼吸）。这项研究为评估和理解深海珊瑚对海洋酸化的敏感性迈出了重要的第一步。
Several forms of calcifying scleractinian corals provide important habitat complexity in the deep-sea and are consistently associated with a high biodiversity of fish and other invertebrates. How these corals may respond to the future predicted environmental conditions of ocean acidification is poorly understood, but any detrimental effects on these marine calcifiers will have wider impacts on the ecosystem. Colonies of Solenosmilia variabilis, a protected deep-sea coral commonly occurring throughout the New Zealand region, were collected during a cruise in March 2014 from the Louisville Seamount Chain. Over a 12-month period, samples were maintained in temperature controlled (similar to 3.5 degrees C) continuous flow-through tanks at a seawater pH that reflects the region's current conditions (7.88) and an end-of-century scenario (7.65). Impacts on coral growth and the intensity of colour saturation (as a proxy for the coenenchyme tissue that covers the coral exoskeleton and links the coral polyps) were measured bimonthly. In addition, respiration rate was measured after a mid-term (six months) and long-term (12 months) exposure period. Growth rates were highly variable, ranging from 0.53 to 3.068 mm year(-1) and showed no detectable difference between the treatment and control colonies. Respiration rates also varied independently of pH and ranged from 0.065 to 1.756 mu mol O-2 g protein(-1) h(-1). A significant change in colour was observed in the treatment group over time, indicating a loss of coenenchyme. This loss was greatest after 10 months at 5.28% and could indicate a reallocation of energy with physiological processes (e.g. growth and respiration) being maintained at the expense of coenenchyme production. This research illustrates important first steps to assessing and understanding the sensitivity of deep-sea corals to ocean acidification.