Penney D G
Comp Biochem Physiol A Comp Physiol. 1987;86(4):609-15. doi: 10.1016/0300-9629(87)90610-4.
The ability of frogs and turtles to overwinter and to survive hypoxia and anoxia has long been a topic of interest. While data remains scant, the emerging picture shows fundamentally different approaches to overwintering in these two groups of ectotherms. Frogs are far more limited by availability of oxygen than are turtles, even at near-freezing ambient temperatures. The reasons for this probably involve the vastly greater cutaneous permeability of the former. With their extreme tolerance of anoxia and profound suppression of metabolism, overwintering in turtles should not be viewed as simply prolonged diving but rather as ectotherm hibernation. Their incredible diving capabilities are merely a spin-off of a successful overwintering strategy. The following discussion reviews the major physiological mechanisms involved in the overwintering strategies of these two ectotherm groups.
青蛙和海龟越冬以及在缺氧和无氧环境下生存的能力长期以来一直是人们感兴趣的话题。尽管相关数据仍然稀少，但新出现的情况表明，这两类变温动物在越冬方式上存在根本差异。即使在接近冰点的环境温度下，青蛙比海龟更容易受到氧气供应的限制。其原因可能与前者皮肤通透性大得多有关。由于海龟对缺氧具有极强的耐受性且新陈代谢受到深度抑制，海龟的越冬不应简单地被视为延长的潜水，而应被视为变温动物的冬眠。它们令人难以置信的潜水能力仅仅是成功越冬策略的一个附带结果。以下讨论回顾了这两类变温动物越冬策略中涉及的主要生理机制。
