Rosas C, Bolongaro-Crevenna A, Sanchez A, Gaxiola G, Soto L, Escobar E
Biol Bull. 1995 Oct;189(2):168-174. doi: 10.2307/1542467.
We determined the role of the digestive gland in the respiratory metabolism of Penaeus setiferus adult males as a step toward proposing a feeding schedule based on the cycle of activity in the digestive gland. We measured pre- and postprandial values for oxygen consumption rate and hemolymph glucose concentrations in live animals, and oxygen consumption rate and glycogen concentration in excised digestive gland. After the animals were fed, which enhanced general metabolic activity, these indices changed. There was a high correlation between the oxygen consumption rate of the animal and the glucose concentration in the hemolymph, and between the oxygen consumption rate by the digestive gland and the glycogen concentration in the digestive gland, all in relation to time after feeding. Correlations support the hypothesis that the energy demand depends upon the metabolic substrate concentration. In this theory, glucose sustains muscle activity (during ingestion of food) and glycogen is the product of the digestive gland during food assimilation. Our observations of metabolic dynamics during the feeding period allowed us to examine the feeding process. The metabolic activity of the digestive gland was highest 6 h after feeding. This could mean that assimilation, having started 2 h after food intake, peaked 6 h after feeding. Eight hours after feeding, the oxygen consumption rate of the digestive gland decreased and fell to values similar to those recorded for animals subjected to 72 h of fasting.
我们确定了消化腺在成年雄性长毛对虾呼吸代谢中的作用，以此作为朝着根据消化腺的活动周期制定摄食计划迈出的一步。我们测量了活体动物摄食前后的耗氧率和血淋巴葡萄糖浓度，以及切除的消化腺的耗氧率和糖原浓度。动物进食后，整体代谢活动增强，这些指标发生了变化。动物的耗氧率与血淋巴中的葡萄糖浓度之间，以及消化腺的耗氧率与消化腺中的糖原浓度之间，在进食后的时间方面都存在高度相关性。这些相关性支持了能量需求取决于代谢底物浓度的假设。在这个理论中，葡萄糖维持肌肉活动（在食物摄取期间），而糖原是食物同化过程中消化腺的产物。我们对摄食期间代谢动态的观察使我们能够研究摄食过程。消化腺的代谢活动在进食后6小时最高。这可能意味着同化作用在食物摄入后2小时开始，在进食后6小时达到峰值。进食8小时后，消化腺的耗氧率下降，降至与禁食72小时的动物所记录的值相似。
