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Ventilatory physiology of the numbat (Myrmecobius fasciatus)

机译:食蚁动物(Myrmecobius fasciatus)的通气生理

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摘要

This study examines the ventilatory physiology of the numbat (Myrmecobius fasciatus), a small to medium-sized (550 g) termitivorous marsupial. Ventilatory parameters at thermoneutrality reflect the slightly low (83% of predicted) basal metabolic rate of the numbat, with ventilation frequency (infinity(R); 30.6+/-3.65 breaths min(-1)), tidal volume [V-T; 6.0+/-0.66 ml at body temperature and pressure, saturated (BTPS)] and consequently minute volume (V-I; 117.7+/-15.22 ml min(-1); BTPS) all being 80-87% of that expected for a marsupial of similar body mass. Oxygen extraction was 27.7+/-1.37% in the thermoneutral zone. As is typical of marsupials, numbats accommodated increased oxygen consumption rates at ambient temperatures (T-a) below the thermoneutral zone by increasing minute volume (up to 411.2+/-43.98 ml min(-1); BTPS at T-a=10 degreesC) rather than oxygen extraction. Minute volume at 10 degreesC increased more by changes in ventilation frequency (up to 45.5+/-4.85 breaths min(-1)) than tidal volume (9.4+/-1.03 ml, BTPS), as is also typical for a small-medium sized marsupial.
机译:这项研究检查了食蚁兽(Myrmecobius fasciatus)的通风生理,食蚁兽是一种小型至中型(550克)白蚁有袋动物。热中性时的通气参数反映了食指的基础代谢率略低(预测值的83%),具有通气频率(infinity(R); 30.6 +/- 3.65呼吸min(-1)),潮气量[V-T;在体温和压力下为6.0 +/- 0.66 ml,饱和状态(BTPS)],因此每分钟的体积(VI; 117.7 +/- 15.22 ml min(-1); BTPS)全部为有袋动物的预期值的80-87%相似的体重。热中性区的氧气提取率为27.7 +/- 1.37%。如典型的有袋动物一样,食指动物通过增加分钟体积(最大为411.2 +/- 43.98 ml min(-1); Ta = 10℃时的BTPS)来适应热中性区域以下的环境温度(Ta)所增加的耗氧率。氧气提取。通气频率的变化(最多45.5 +/- 4.85分钟min(-1))比潮气量(9.4 +/- 1.03 ml,BTPS)增加,在10°C时的分钟体积增加得更多,这也是中小型情况下的典型情况大小的有袋动物。

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