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首页> 外文期刊>Marine biology >Metabolic responses of the North Pacific krill, Euphausia pacifica, to short- and long-term pCO(2) exposure
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Metabolic responses of the North Pacific krill, Euphausia pacifica, to short- and long-term pCO(2) exposure

机译：北太平洋磷虾，太平洋虾（Euphausia pacifica）对短期和长期pCO（2）暴露的代谢反应

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While ocean acidification is likely to have major effects on many marine organisms, those species that regularly experience variable pCO(2) environments may be more tolerant of future predicted changes in ocean chemistry. Euphausia pacifica is an abundant krill species along the Pacific coast of North America and one that regularly experiences varying pCO(2) levels during seasonal upwelling, as well as during daily vertical migrations to depth where pCO(2) is higher. Krill were collected from Monterey Bay, California (36.8 degrees N, 121.9 degrees W), and experiments were performed from June to August 2014 and maintained at two pCO(2) levels (400 and 1200 mu atm). Three metabolic responses (oxygen consumption, ingestion rate, and nutrient excretion rates) of E. pacifica were measured. Oxygen consumption declined by 31 % in the first 24 h following exposure to high pCO(2) and remained low after 21 days. Oxygen consumption at low pCO(2) was low for the first 12 h, increased by 34 % at 24 h, but returned to initial values by 21 days. After 3 weeks of continuous exposure, oxygen consumption rates were 32 % lower in the high pCO(2) group. Ingestion and ammonium excretion rates were both significantly lower in the high pCO(2) group after 24-h exposure, but not after 7 or 21 days. There was no effect of pCO(2) on phosphate excretion. Taken together, these results indicate that E. pacifica has a lower metabolic rate during both short-term (24 h) and longer-term (21 days) exposure to high pCO(2). Such metabolic depression may explain previously reported declines in growth of E. pacifica exposed to high pCO(2).
机译：虽然海洋酸化可能对许多海洋生物产生重大影响，但那些经常经历可变pCO（2）环境的物种可能更能容忍海洋化学未来的预测变化。太平洋磷虾（Euphausia pacifica）是北美太平洋沿岸的一种丰富的磷虾种类，在季节性上升过程中以及在日常垂直迁移到pCO（2）较高的深度期间，磷虾经常经历变化的pCO（2）水平。磷虾采自加利福尼亚州蒙特雷湾（北纬36.8度，西纬121.9度），实验于2014年6月至2014年8月进行，并保持在两个pCO（2）水平（400和1200微米大气压）。测量了太平洋大肠埃希氏菌的三种代谢反应（耗氧量，摄取速率和营养物质排泄速率）。暴露于高pCO（2）后的最初24小时内，氧气消耗量下降了31％，而在21天后仍保持在低水平。在低pCO（2）下的氧气消耗在开始的12小时内很低，在24 h时增加了34％，但在21天后恢复到初始值。连续暴露3周后，高pCO（2）组的氧气消耗率降低了32％。暴露24小时后，高pCO（2）组的摄入量和铵盐排泄率均显着降低，但7或21天后则没有。没有对磷酸盐排泄pCO（2）的影响。两者合计，这些结果表明，在高pCO（2）的短期（24小时）和长期（21天）暴露期间，太平洋大肠杆菌的代谢率较低。这种代谢抑制可能可以解释先前报道的暴露于高pCO（2）的大肠杆菌的生长下降。

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  • 来源
    《Marine biology》 |2016年第10期|207.1-207.13|共13页
  • 作者

    Cooper Helen L.; Potts Donald C.; Paytan Adina;

  • 作者单位

    Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, 1156 High St, Santa Cruz, CA 95064 USA;

    Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, 1156 High St, Santa Cruz, CA 95064 USA;

    Univ Calif Santa Cruz, Inst Marine Sci, 1156 High St, Santa Cruz, CA 95064 USA;

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