急性CO<sub>2</sub>酸化对菲律宾蛤仔钙壳和呼吸作用的影响

徐雪梅; 翟惟东; 吴金浩

doi:10.3969/j.issn.0253-4193.2013.05.012

急性CO₂酸化对菲律宾蛤仔钙壳和呼吸作用的影响

doi: 10.3969/j.issn.0253-4193.2013.05.012

1.
国家海洋环境监测中心国家海洋局近岸海域生态环境重点实验室, 辽宁大连 116023
2.
辽宁省海洋水产科学研究院, 辽宁大连 116023

基金项目: 国家重点基础研究发展计划(2009CB421204);国家自然科学基金项目(41206060;41276061);国家海洋局北黄海海-气二氧化碳交换通量试点性监测项目。

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出版历程
- 收稿日期: 2012-12-19

Effects of CO₂-driven ocean acidification on the calcification and respiration of Ruditapes philippinarum

1.
Key Laboratory for Ecological Environment in Coastal Areas, National Marine Environmental Monitoring Center, Dalian 116023, China
2.
LiaoNing Ocean and Fishery Science Research Institute, Dalian 116023, China

摘要

摘要: 基于渤海表层典型的碳酸盐系统,通过实验室密闭培养实验,分析急性CO₂酸化条件对菲律宾蛤仔(Ruditapes philippinarum) CaCO₃形成速率(G)和CO₂呼吸速率(R_C)的影响,以探讨局部海域CO₂酸化的底层海水在潮流或者风海流等因素的驱动下,脉冲式影响贝类栖息地时养殖贝类可能的响应。结果表明,菲律宾蛤仔在急性CO₂酸化条件下发生轻微的钙壳溶解和显著的呼吸抑制。CO₂酸化和菲律宾蛤仔的呼吸作用共同驱动钙壳溶解,溶解速率随Ω_文石下降而升高,G(μmol/(FWg·h))=0.14 × Ω_文石-0.49 (n=12, r=0.95, p<0.01)。活体菲律宾蛤仔钙壳保持稳定的Ω_文石临界值为3.5,而在Ω_文石=1.0的条件下,每天溶解的钙壳相当于贝壳总重的2‰。相较于钙壳溶解,Ω_文石改变对菲律宾蛤仔呼吸作用的影响更大,R_C(μmol/(FWg·h))=0.27 × Ω_文石+0.90 (n =12, r=0.82, p<0.01)。由于呼吸代谢决定了摄食等各种耗能行为的效率,因此本研究的结果表明,尽管菲律宾蛤仔可以通过摄食等自身调节机制来抵御造成钙壳溶解的环境胁迫,然而这一机制本身就可能受到酸化环境的不良影响。
- 急性CO₂酸化 /
- 菲律宾蛤仔 /
- 碳酸钙饱和度 /
- 钙壳溶解 /
- 呼吸作用
Abstract: A popularly cultured marine shellfish (Ruditapes philippinarum) was exposed to a series of CO₂-acidified seawaters for 4 hours. The waters had a constant salinity of 30.7 and an alkalinity of 2 350 μmol/kg. Both were the typical values of the surface water of Bohai Sea. Using the alkalinity anomaly method, effects of CO₂-driven ocean acidification on the calcification and respiration of R. philippinarum were investigated. The results showed that, slight shell dissolution and significant respiration decline of R. philippinarum occurred under several short-term CO₂-acidified scenarios. A function of CaCO₃ production rate (G) versus CaCO₃ saturation of aragonite (Ω_arag) had been developed as G(μmol/FWg·h)=0.14 × Ω_arag-0.49 (n=12, r=0.95, p<0.01). This function suggested that the shell is instable on the conditions of Ω_arag <3.5. However in a scenario where Ω_arag decreases to 1.0-1.5 in CO₂-acidified subsurface waters in the Bohai Sea (in late summer) and the North Yellow Sea (in autumn), the daily dissolved shell is only equivalent to insignificantly <2‰ of the net shell weight. In contrast, respiration declines and metabolic activity changes of R. philippinarum under CO₂-driven acidification were more notable. The function of inorganic carbon production rate (R_C) of R. philippinarum versus Ω_arag was R_C(μmol/FWg·h)=0.27 × Ω_arag+0.90 (n=12, r=0.82, p<0.01), suggesting that declines of Ω_arag had negative impacts on respiration much more than shell dissolution.
- CO₂-driven acidification /
- Ruditapes philippinarum /
- CaCO₃ saturation /
- shell dissolution /
- respiration

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