Price Edwin R, Paladino Frank V, Strohl Kingman P, Santidrián T Pilar, Klann Kenneth, Spotila James R
Department of Biology, Indiana-Purdue University at Fort Wayne, Fort Wayne, IN 46805, USA.
Comp Biochem Physiol A Mol Integr Physiol. 2007 Mar;146(3):422-8. doi: 10.1016/j.cbpa.2006.11.034. Epub 2006 Dec 12.
The pattern and control of respiration is virtually unknown in hatchling sea turtles. Using incubator-raised turtles, we measured oxygen consumption, frequency, tidal volume, and minute volume for leatherback (Dermochelys coriacea) and olive ridley (Lepidochelys olivacea) turtle hatchlings for the first six days after pipping. In addition, we tested the hatchlings' response to hypercapnic, hyperoxic, and hypoxic challenges over this time period. Hatchling sea turtles generally showed resting ventilation characteristics that are similar to those of adults: a single breath followed by a long respiratory pause, slow frequency, and high metabolic rate. With hypercapnic challenge, both species responded primarily by elevating respiratory frequency via a decrease in the non-ventilatory period. Leatherback resting tidal volume increased with age but otherwise, neither species' resting respiratory pattern nor response to gas challenge changed significantly over the first few days after hatching. At the time of nest emergence, sea turtles have achieved a respiratory pattern that is similar to that of actively diving adults.
刚孵化出的海龟的呼吸模式和控制机制实际上还不为人所知。我们利用在孵化器中饲养的海龟，测量了蠵龟（棱皮龟）和榄蠵龟幼龟在破壳后的头六天的耗氧量、呼吸频率、潮气量和分钟通气量。此外，我们还测试了这段时间内幼龟对高碳酸血症、高氧血症和低氧血症挑战的反应。刚孵化出的海龟通常表现出与成年海龟相似的静息通气特征：单次呼吸后跟随长时间的呼吸暂停、呼吸频率缓慢以及代谢率高。在高碳酸血症挑战下，两个物种主要通过缩短非通气期来提高呼吸频率做出反应。蠵龟的静息潮气量随年龄增长而增加，但除此之外，在孵化后的头几天里，两个物种的静息呼吸模式以及对气体挑战的反应都没有显著变化。在出巢时，海龟已经形成了一种与活跃潜水的成年海龟相似的呼吸模式。
