Locomotor costs of pregnancy in a viviparous toad-headed lizard, Phrynocephalus vlangalii (Agamidae)
Locomotor costs of pregnancy in a viviparous toad-headed lizard, Phrynocephalus vlangalii (Agamidae)
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发表时间：
2015
影响因子：
1
通讯作者：
Hong-Liang Lu;Chuan-Quan Jiang;X. Ji
中科院分区：
文献类型：
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作者：
Hong-Liang Lu;Chuan-Quan Jiang;X. Ji
怀孕期间的运动障碍可归因于身体负担或与怀孕相关的生理变化。然而，物理和生理变化影响生殖成本的程度可能因物种而异。在这里，我们使用青海蟾头蜥蜴（Phrynocephalus vlangalii）作为一个模型，以评估运动成本在怀孕期间和怀孕胎生蜥蜴的身体和生理效应的相对影响。怀孕的运动成本是明显的：冲刺速度逐渐下降，在整个怀孕期间，分娩时达到最低点，此后缓慢增加。妊娠母鼠的下降速度与相对窝重无关。与非生殖雌性或雄性的运动相比，怀孕雌性表现出较低的速度和较短的步幅。这些结果表明，尽管对运动性能有物理影响，但与妊娠相关的生理变化可能在妊娠的P. vlangalii的运动障碍中起主要作用。
Locomotor impairment during pregnancy can be attributed to physical burden or physiological changes associated with pregnancy. However, the degree to which physical and physiological changes affect reproductive costs likely varies between species. Here, we used the Qinghai toad-headed lizard (Phrynocephalus vlangalii) as a model to assess locomotor costs during pregnancy and the relative impact of physical and physiological effects in pregnant viviparous lizards. The locomotor costs of pregnancy were pronounced: sprint speed decreased gradually throughout pregnancy, reached a minimum at parturition and increased slowly thereafter. The reduced speed in pregnant females was not related to relative litter mass. Compared with the locomotion of non-reproductive females or males, pregnant females exhibited lower speeds and shorter stride lengths. These results suggest that, despite having a physical effect on locomotor performance, physiological changes associated with pregnancy likely play a major role in locomotor impairment in pregnant P. vlangalii.