Effects of ocean acidification on overwintering juvenile Arctic pteropods Limacina helicina
Effects of ocean acidification on overwintering juvenile Arctic pteropods Limacina helicina
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DOI：
10.3354/meps09696
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发表时间：
2012-01-01
影响因子：
2.5
通讯作者：
Gattuso, J. -P.
中科院分区：
文献类型：
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作者：
Comeau, S.;Alliouane, S.;Gattuso, J. -P.
翼足类动物是浮游软体动物，在各种生态系统的食物网中发挥着重要作用，特别是在高纬度地区。由于它们产生文石壳，翼荚预计对人为二氧化碳排放导致的海洋酸化非常敏感。使用来自北冰洋加拿大盆地的北极翼足类 Limacina helicina 幼鱼研究了海洋酸化的影响。将动物维持在3种受控pH条件（总pH值[pH(T)]大约为8.05、7.90或7.75）下8天，并监测它们的死亡率和壳的线性延伸。 pH 值不会影响死亡率，但壳的线性延伸随着 pH 值的下降而减小。令人惊讶的是，翼荚在文石饱和度低至 0.6 的情况下仍然能够伸展它们的壳。然而，整个壳上都可见溶解痕迹，表明碳酸钙也发生了溶解，这使人们对翼足类在腐蚀条件下维持碳酸钙沉淀和溶解之间正平衡的能力产生怀疑。
Pteropods are planktonic mollusks that play an important role in the food web of various ecosystems, particularly at high latitudes. Because they produce an aragonitic shell, ptero pods are expected to be very sensitive to ocean acidification driven by anthropogenic CO2 emissions. The effect of ocean acidification was investigated using juveniles of the Arctic pteropod Limacina helicina from the Canada Basin of the Arctic Ocean. The animals were maintained in 3 controlled pH conditions (total scale pH [pH(T)] approximate to 8.05, 7.90 or 7.75) for 8 d, and their mortality and the linear extension of their shell were monitored. The pH did not impact the mortality rate, but the linear extension of the shell decreased as a function of declining pH. Surprisingly, the ptero pods were still able to extend their shell at an aragonite saturation state as low as 0.6. Nevertheless, dissolution marks were visible on the whole shell, indicating that calcium carbonate dissolution had also occurred, casting doubts on the ability of the pteropods to maintain a positive balance between precipitation and dissolution of calcium carbonate under corrosive conditions.