怀孕后期可能会使短尾蜥蜴面临风险

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怀孕对准妈妈们来说是相当大的挑战。 但与即将临盆的短尾蜥蜴所忍受的痛苦相比,这些都显得苍白无力。 事实上,关于澳大利亚爬行动物的新研究表明,随着雌性蜥蜴接近足月,她的生命可能处于危险之中。

阿德莱德大学的苏西·芒斯报告说,主要问题在于,到分娩时,这种生物携带的幼蜥蜴重量相当于其体重的 35%——相当于人类怀了一个六岁的孩子。 更糟糕的是,怀孕的短尾蜥蜴的身体不会随着幼崽的生长而扩张。 因此,发育中的胎儿(短尾蜥蜴每次生育一到四只幼崽)占据了母亲身体腔的越来越多的空间,这使得她的肺和消化道空间越来越小。

芒斯评论说:“我发现,随着怀孕的深入,它们的正常呼吸能力越来越差,在分娩前的最后六到八周,呼吸频率和呼吸量都显著降低。” 在短尾蜥蜴五到六个月妊娠期的最后四周,她几乎不移动,这使她很容易成为捕食者的目标。 觅食也同样困难。 事实上,芒斯发现短尾蜥蜴几乎什么都不吃。

Kate Wong is an award-winning science writer and senior editor at 大众科学 focused on evolution, ecology, anthropology, archaeology, paleontology and animal behavior. She is fascinated by human origins, which she has covered for more than 25 years. Recently she has become obsessed with birds. Her reporting has taken her to caves in France and Croatia that Neandertals once called home, to the shores of Kenya's Lake Turkana in search of the oldest stone tools in the world, to Madagascar on an expedition to unearth ancient mammals and dinosaurs, to the icy waters of Antarctica, where humpback whales feast on krill, and on a "Big Day" race around the state of Connecticut to find as many bird species as possible in 24 hours. Kate is co-author, with Donald Johanson, of Lucy's Legacy: The Quest for Human Origins. She holds a bachelor of science degree in biological anthropology and zoology from the University of Michigan. Follow Wong on X (formerly Twitter) @katewong

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