National Research Council Post-Doctoral Associate at NOAA NMFS, 212 Rogers Ave., Milford, CT 06418, USA.
NOAA Fisheries Service, Northeast Fisheries Science Center, 212 Rogers Ave, Milford, CT 06460, USA.
Mar Pollut Bull. 2020 Dec;161(Pt B):111740. doi: 10.1016/j.marpolbul.2020.111740. Epub 2020 Oct 28.
In this study, we assessed the Atlantic surfclam (Spisula solidissima) energy budget under different ocean acidification conditions (OA). During 12 weeks, 126 individuals were maintained at three different ρCO concentrations. Every two weeks, individuals were sampled for physiological measurements and scope for growth (SFG). In the high ρCO treatment, clearance rate decreased and excretion rate increased relative to the low ρCO treatment, resulting in reduced SFG. Moreover, oxygen:nitrogen (O:N) excretion ratio dropped, suggesting that a switch in metabolic strategy occurred. The medium ρCO treatment had no significant effects upon SFG; however, metabolic loss increased, suggesting a rise in energy expenditure. In addition, a significant increase in food selection efficiency was observed in the medium treatment, which could be a compensatory reaction to the metabolic over-costs. Results showed that surfclams are particularly sensitive to OA; however, the different compensatory mechanisms observed indicate that they are capable of some temporary resilience.
在这项研究中，我们评估了大西洋美洲帘蛤（Spisula solidissima）在不同海洋酸化条件（OA）下的能量预算。在 12 周的时间里，126 个个体被维持在三种不同的 ρCO 浓度下。每两周对个体进行一次生理测量和生长范围（SFG）取样。在高 ρCO 处理中，与低 ρCO 处理相比，清除率降低，排泄率增加，导致 SFG 降低。此外，氧：氮（O:N）排泄比下降，表明代谢策略发生了转变。中 ρCO 处理对 SFG 没有显著影响；然而，代谢损失增加，表明能量消耗增加。此外，在中处理组中观察到食物选择效率显著提高，这可能是对代谢过度成本的一种补偿反应。结果表明，美洲帘蛤对海洋酸化特别敏感；然而，观察到的不同补偿机制表明，它们有一定的临时恢复能力。
