Andrade Denis V, Brito Simone P, Toledo Luís Felipe, Abe Augusto S
Departamento de Zoologia, Universidade Estadual Paulista, Caixa Postal 199, 13500-970 Rio Claro, SP, Brazil.
Respir Physiol Neurobiol. 2004 May 20;140(2):197-208. doi: 10.1016/j.resp.2004.01.007.
Oxygen-binding properties, blood gases, and acid-base parameters were studied in tegu lizards, Tupinambis merianae, at different seasons and temperatures. Independent of temperature and pH, blood oxygen affinity was higher in dormant lizards than in those active during the summer. Haematocrit (Hct) and hemoglobin content ([Hb]) were greater in active lizards resulting in a higher oxygen-carrying capacity. Nucleoside triphosphate content ([NTP]) was reduced during dormancy, but the ratio between [NTP] and [Hb] remained unchanged. Dormancy was accompanied by an increase in plasma bicarbonate ([HCO-(3)]pl) and an elevation of arterial CO2 partial pressure (PaCO2) and CO2 content in the plasma (CplCO2). These changes in acid-base parameters persist over a broad range of body temperatures. In vivo, arterial O2 partial pressure (PaO2) and O2 content (CaO2) were not affected by season and tended to increase with temperature. Arterial pH (pHa) of dormant animals is reduced compared to active lizards at body temperatures below 15 degrees C, while no significant difference was noticed at higher temperatures.
在不同季节和温度条件下，对泰加蜥蜴（Tupinambis merianae）的氧结合特性、血气和酸碱参数进行了研究。与温度和pH无关，休眠蜥蜴的血液氧亲和力高于夏季活跃的蜥蜴。活跃蜥蜴的血细胞比容（Hct）和血红蛋白含量（[Hb]）更高，导致携氧能力更强。休眠期间三磷酸核苷含量（[NTP]）降低，但[NTP]与[Hb]的比值保持不变。休眠伴随着血浆碳酸氢盐（[HCO₃⁻]pl）增加、动脉血二氧化碳分压（PaCO₂）升高以及血浆中二氧化碳含量（CplCO₂）升高。这些酸碱参数的变化在很宽的体温范围内持续存在。在体内，动脉血氧分压（PaO₂）和氧含量（CaO₂）不受季节影响，并且往往随温度升高而增加。在体温低于15摄氏度时，休眠动物的动脉pH（pHa）低于活跃蜥蜴，而在较高温度下未观察到显著差异。
