Growth and feeding of deep-sea coral Lophelia pertusa from the California margin under simulated ocean acidification conditions.
Growth and feeding of deep-sea coral Lophelia pertusa from the California margin under simulated ocean acidification conditions.
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作者：
Gómez CE;Wickes L;Deegan D;Etnoyer PJ;Cordes EE
被称为海洋酸化的全球海水pH值下降具有重要的生态后果，对许多海洋生物构成迫在眉睫的威胁。尽管深海通常被认为是一个稳定的环境，但它可能是动态的，容易受到人为干扰，包括温度上升、脱氧、海洋酸化和污染。Pophelia pertusa是研究得较好的冷水珊瑚之一，但最近才在美国西海岸记录到，生长在酸化的条件下。在目前的研究中，珊瑚碎片是在南加州边缘的∼300m深处收集的，并保存在循环水箱中，模拟该物种在自然环境中通常存在的条件。在采集点，水体表现出持续的低pH和文石饱和状态(ΩArag)，其平均值分别为7.66±0.0 1和0.81±0.0 7。在实验室中，在pH/Ω为7.9/1.47时(文石饱和)和pH/Ω时为7.6/0.84时(文石不饱和)条件下培养3周。有非常显著的处理效果(P<0.001)，有利条件下的平均净钙化百分率为0.023±0.009%d−1，不利条件下的−净溶解百分数为0.010±0.014%d-1。我们没有发现任何处理对摄食率的影响，这表明珊瑚在低pH/Ω的环境中并没有为了节省能量而抑制摄食。然而，这些结果表明，加州边缘Pertusa的次优条件可能会潜在地威胁到这种冷水珊瑚的持久性，并对这个本已脆弱的生态系统未来的稳定性产生负面影响。
The global decrease in seawater pH known as ocean acidification has important ecological consequences and is an imminent threat for numerous marine organisms. Even though the deep sea is generally considered to be a stable environment, it can be dynamic and vulnerable to anthropogenic disturbances including increasing temperature, deoxygenation, ocean acidification and pollution. Lophelia pertusa is among the better-studied cold-water corals but was only recently documented along the US West Coast, growing in acidified conditions. In the present study, coral fragments were collected at ∼300 m depth along the southern California margin and kept in recirculating tanks simulating conditions normally found in the natural environment for this species. At the collection site, waters exhibited persistently low pH and aragonite saturation states (Ωarag) with average values for pH of 7.66 ± 0.01 and Ωarag of 0.81 ± 0.07. In the laboratory, fragments were grown for three weeks in “favorable” pH/Ωarag of 7.9/1.47 (aragonite saturated) and “unfavorable” pH/Ωarag of 7.6/0.84 (aragonite undersaturated) conditions. There was a highly significant treatment effect (P < 0.001) with an average% net calcification for favorable conditions of 0.023 ± 0.009% d−1 and net dissolution of −0.010 ± 0.014% d-1 for unfavorable conditions. We did not find any treatment effect on feeding rates, which suggests that corals did not depress feeding in low pH/ Ωarag in an attempt to conserve energy. However, these results suggest that the suboptimal conditions for L. pertusa from the California margin could potentially threaten the persistence of this cold-water coral with negative consequences for the future stability of this already fragile ecosystem.
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