The oxygen consumption of a freshwater benthic nematode, Tobrilus gracilis (Bastian)
The oxygen consumption of a freshwater benthic nematode, Tobrilus gracilis (Bastian)
复制标题
淡水底栖线虫 Tobrilus gracilis (Bastian) 的耗氧量
作者：
F. Schiemer;A. Duncan
纤细Tobrilus gracilis（Bastian）主要生活在奥地利Neusiedlersee的缺氧泥层中。用笛卡尔潜水员呼吸计测量所有活跃生命阶段的O2-消耗。呼吸-体重回归（R=aWb;以μl O2·10-3/个体·h和μg湿重计）计算为R=0.522 W0.693。这表明该物种不是强制性厌氧的，但可以在可用时使用氧气。此外，使用文献数据计算了其他四种线虫的呼吸-体重回归。回归系数范围为0.68-0.85，但无显著差异（P=0.05）。y轴截距（回归方程中的“a”）表示一个物种的代谢率，在20°C时范围为1.34-2.01 μl·10-3 O2/个体·h。采用协方差分析方法对纤细Tobrilus gracilis、麦长管蚜Aesthenchus avenae和Panagrolaimus rigidus代谢活性水平的差异进行了检验。可以表明，与其他物种相比，Tobrilus的耗氧量明显较低，并且可以得出结论，即使在氧气可用的情况下，该物种的代谢也是部分厌氧的。
SummaryTobrilus gracilis (Bastian) was found to live predominantly in oxygen deficient mud layers of Neusiedlersee, Austria. The O2-consumption of all active life stages was measured with Cartesian diver respirometers. The respiration-body weight regression (R=aWb; in μl O2·10-3/individual·h and μg wet weight) was calculated to be R=0.522 W0.693. This suggests that the species is not obligatory anaerobic but can use oxygen when available. Furthermore, a respiration-body weight regression was calculated for four other nematodes from a wide range of habitats using literature data. The regression coefficients ranged from 0.68–0.85 but were not significantly different (P=0.05). The intercept of the y-axis (“a” in the regression equation), which indicates the metabolic rate of a species, ranged from 1.34–2.01 μl·10-3 O2/individual·h at 20°C. Covariance analysis was used to test the differences in the level of metabolic activity for Tobrilus gracilis, Aphelenchus avenae and Panagrolaimus rigidus. It could be shown, that oxygen consumption of Tobrilus is significantly lower compared with the other species and it is concluded that the metabolism of this species is partially anaerobic, even when oxygen is available.