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首页> 外文期刊>Oecologia >Does excess dietary carbon affect respiration of Daphnia?
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Does excess dietary carbon affect respiration of Daphnia?

机译：膳食中过量的碳会影响水蚤的呼吸吗？

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摘要

Like many invertebrate herbivores, Daphnia frequently face diets with excess carbon (C) relative to elements like phosphorus (P), and with limited ability to store C-rich compounds. To cope with this relative surplus of C they may either regulate the net uptake of C or dispose of excess assimilated C via increased release of dissolved organic carbon or CO2. Here we investigate whether juvenile Daphnia magna use respiration as a means of stoichiometrically regulating excess C. Growth rate and respiration were measured under different algal food qualities (P-replete and P-depleted algae). Growth rate was strongly reduced by P-depleted food, implying a stoichiometric disposal of excess ingested C. Respiration rates of feeding animals were measured after short- (0.5 h), medium- (12 h) and long- (five days) term acclimation to P-limited food. The respiration rates of animals during active feeding were not affected by the acclimation period per se, whereas food quality had a significant effect; respiration rates of feeding animals increased slightly in individuals receiving low-P food under all acclimation regimes. Respiration was also measured on nonfeeding and fasting animals that had been acclimated for five days to P-limited food. Respiration rates of these animals were strongly affected by feeding conditions but not by food quality; feeding individuals had higher respiration rates than those deprived of food, which again had higher respiration than fasting animals. Although animals grown on low-P food had strongly reduced growth and thus were expected to have decreased respiration rates due to reduced growth-related costs, this seems to be canceled out by increased stoichiometric respiration under P-deficiency. These results indicate that D. magna partly releases excess C as CO2, but other means of stoichiometric regulation most likely add to this.
机译：与许多无脊椎动物食草动物一样，水蚤相对于诸如磷（P）等元素而言，其饮食中的碳（C）过多，而储存高碳化合物的能力却有限。为了应对这种相对过量的C，他们可以调节C的净摄入量，也可以通过增加溶解的有机碳或CO2的释放来处置过量的同化C。在这里，我们调查了大型水蚤（Daphnia magna）是否使用呼吸作为化学计量调节过量C的手段。在不同藻类食物质量（富P和贫P藻）下测量了生长速率和呼吸。贫磷食物会大大降低生长速度，这意味着化学计量处理了过量摄入的碳。在短期（0.5 h），中期（12 h）和长期（五天）适应后，测量了喂养动物的呼吸速率限磷食物。主动喂养期间动物的呼吸速率本身不受驯化期的影响，而食品质量具有显着影响。在所有适应条件下，接受低磷食物的个体的觅食动物呼吸速率均略有增加。还测量了已经适应五日限食的非喂养和禁食动物的呼吸。这些动物的呼吸速率受喂养条件的强烈影响，但不受食品质量的影响;进食的人比没有食物的人有更高的呼吸率，而没有食物的人又比禁食的动物有更高的呼吸。尽管使用低磷食物饲养的动物的生长速度大大降低，因此由于与生长相关的成本降低而预计呼吸频率会降低，但磷缺乏时化学计量呼吸的增加似乎抵消了这种情况。这些结果表明，D。magna会部分释放过量的C以CO2的形式释放，但化学计量调节的其他方式最有可能添加到其中。

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