懷孕後期可能會使短尾蜥蜴面臨風險

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懷孕對準媽媽們來說是相當大的挑戰。 但與即將臨盆的短尾蜥蜴所忍受的痛苦相比,這些都顯得蒼白無力。 事實上,關於澳大利亞爬行動物的新研究表明,隨著雌性蜥蜴接近足月,她的生命可能處於危險之中。

阿德萊德大學的蘇西·芒斯報告說,主要問題在於,到分娩時,這種生物攜帶的幼蜥蜴重量相當於其體重的 35%——相當於人類懷了一個六歲的孩子。 更糟糕的是,懷孕的短尾蜥蜴的身體不會隨著幼崽的生長而擴張。 因此,發育中的胎兒(短尾蜥蜴每次生育一到四隻幼崽)佔據了母親身體腔的越來越多的空間,這使得她的肺和消化道空間越來越小。

芒斯評論說:“我發現,隨著懷孕的深入,它們的正常呼吸能力越來越差,在分娩前的最後六到八週,呼吸頻率和呼吸量都顯著降低。” 在短尾蜥蜴五到六個月妊娠期的最後四周,她幾乎不移動,這使她很容易成為捕食者的目標。 覓食也同樣困難。 事實上,芒斯發現短尾蜥蜴幾乎什麼都不吃。

Kate Wong is an award-winning science writer and senior editor at 大眾科學 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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