Published online before print May 23, 2011 doi: 10.1073/pnas.1102965108 PNAS May 23, 2011 Behavioral thermoregulation by turtle embryos Wei-Guo Dua,b,1, Bo Zhaob, Ye Chenb, and Richard Shinec aKey Laboratory of Animal Ecology and Conservational Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China;bHangzhou Key Laboratory of Animal Adaptation and Evolution, Hangzhou Normal University, Hangzhou 310036, China; andcSchool of Biological Sciences A08, University of Sydney, Sydney, New South Wales 2006, Australia 1To whom correspondence should be addressed. E-mail: [email protected] Abstract Mobile ectothermic animals can control their body temperatures by selecting specific thermal conditions in the environment, but embryos€€trapped within an immobile egg and lacking locomotor structures€€have been assumed to lack that ability. Falsifying that assumption, our experimental studies show that even early stage turtle embryos move within the egg to exploit small-scale spatial thermal heterogeneity. Behavioral thermoregulation is not restricted to posthatching life and instead may be an important tactic in every life-history stage.
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Fig. 1. Typical positions of embryonic Chinese soft-shelled turtle (P. sinensis) inside eggs that were exposed to heat sources from above (A) or at the left side (B).
外温动物可以在特殊的热条件环境中控制他们的体温,但对于胚胎来说,被困于蛋中,由于结构,而缺少运动,已经是被假设缺乏的能力。这样的假设,在我们实验研究中表明,即使早期的胚胎在蛋内利用异质性热量进行运动。 行为性体温体温调节不只限于孵化后的生命, 而是可能发生在每一个生命历史发展中的重要阶段过程。
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