Resiliency of juvenile walleye pollock to projected levels of ocean acidification
Resiliency of juvenile walleye pollock to projected levels of ocean acidification
复制标题
DOI：
10.3354/ab00483
复制
发表时间：
2012-01-01
期刊：
影响因子：
1.4
通讯作者：
Ahgeak, Ernestine F.
中科院分区：
文献类型：
--
作者：
Hurst, Thomas P.;Fernandez, Elena R.;Ahgeak, Ernestine F.
随着大气中二氧化碳浓度的上升，预计到 2100 年，高纬度海洋的 pH 值将下降 0.3 至 0.5 个单位。在此 pH 范围内海洋酸化的多种生物后果已在无脊椎动物和热带海洋鱼类中得到记录。然而，很少有人研究支持主要渔业的温带和北方海洋鱼类的潜在反应。在 2 项实验中，我们研究了白眼狭鳕 Theragra chalcogramma 幼鱼在环境温度和 3 个升高的 CO2 水平下的生长反应。在一项针对一岁鸽的短期实验中，饲养 6 周后，CO2 处理对生长或状况没有显着影响。 CO2 水平升高（> 450 mu atm）会增加耳石沉积速率，但不影响耳石元素组成。在第二个实验中，在 8 摄氏度下 12 周内，在 2 个较高 CO2 处理（> 1200 mu atm）中，亚一龄树的长度生长速度比在较低 CO2 处理（< 900 mu atm）中快 7.2%。在随后 11 周的 2.5 摄氏度饲养过程中，测量到的一岁以下的生长情况在 CO2 处理之间没有差异。在实验的任一阶段之后，CO2 处理对条件因子均没有影响。一岁以下的消耗率并没有直接受到二氧化碳处理的影响，这证实了在高二氧化碳水平下的生长不能通过补偿性喂养来维持。虽然没有详尽地列出潜在的交互环境因素，但这些实验表明，白眼狭鳕幼鱼的生长能量对下个世纪阿拉斯加湾和白令海预测的二氧化碳变化的直接影响具有总体弹性。
As atmospheric concentrations of CO2 rise, the pH of high-latitude oceans is predicted to decrease by 0.3 to 0.5 units by 2100. Several biological consequences of ocean acidification across this pH range have already been documented in invertebrates and tropical marine fishes. However, little work has been done examining potential responses of the temperate and boreal marine fish species that support major fisheries. In 2 experiments, we examined the growth responses of juvenile walleye pollock Theragra chalcogramma at ambient and 3 elevated CO2 levels. In a short-term experiment with yearlings, CO2 treatment had no significant effect on growth or condition after 6 wk of rearing. Elevated CO2 levels (> 450 mu atm) increased the rate of otolith deposition, but did not affect otolith elemental composition. In a second experiment, growth in length of sub-yearlings over 12 wk at 8 degrees C was 7.2% faster in the 2 higher CO2 treatments (> 1200 mu atm) than in the lower CO2 treatments (< 900 mu atm). Growth of sub-yearlings measured during 11 subsequent weeks of rearing at 2.5 degrees C did not differ among CO2 treatments. There was no effect of CO2 treatment on condition factor following either phase of the experiment. Sub-yearling consumption rates were not directly affected by CO2 treatment, confirming that growth at elevated CO2 levels is not maintained through compensatory feeding. While not exhaustive of potential interactive environmental factors, these experiments demonstrate a general resiliency of growth energetics in juvenile walleye pollock to the direct effects of CO2 changes predicted for the Gulf of Alaska and Bering Sea in the next century.