海洋酸化对栉孔扇贝钙化、呼吸以及能量代谢的影响

摘要

The ocean is becoming more and more acidic in unprecedented speed in the history of the earth resulting from emissions of CO2 by human activities. The survival state of cal cification organisms such as shellfish may be threatened by marine acidification. So the calcification rate and respiratory rate of Chlamys farreri were investigated using the alkalinity anomaly technique at different pH. It was found that calcification rate and respiration rate decreased sig nificantly as pH declined. Calcification rate decreased by 33% when the pH of water was down to 7. 9. At pH 7. 3, calcification rate was almost 0, and respiratory rate (Rc) and O2 consumption rate (Ro) were reduced by 14% and 11% respectively. As marine acidification intensifies, the metabolic pathways of C. Farreri also changed. All changes above may threaten the survival of C. Farreri in the future.%通过“Alkalinity anomaly technique”测定了栉孔扇贝Chlamys farreri在不同酸度条件下的钙化率和呼吸率,发现栉孔扇贝的钙化和呼吸活动受酸化影响显著,均随着酸化的加剧出现了明显下降.当pH降低到7.9时,栉孔扇贝的钙化率将会下降33％左右;当pH降到7.3左右时,栉孔扇贝的钙化率将趋近于0,栉孔扇贝无法产生贝壳,而此时栉孔扇贝碳呼吸率(Rc)与耗氧率(Ro)也分别下降了14％和11％.随着酸化的加剧,栉孔扇贝的能量代谢方式也会发生改变.这些变化都可能影响到栉孔扇贝的生存.