Oxygen consumption of a large, cold-adapted frog egg (Ascaphus truei (Amphibia: Ascaphidae))

摘要: Female Ascaphus lay a small number of large eggs beneath rocks in cold, montane streams the Pacific Northwest. Average per female is 45 (range, 28 to 64) and average egg diameter 4 mm 3.5 4.5). The contain relatively amount nutrients. wet weight single 37.5 mg dry 23.7 mg (63% weight). oxygen consumption rate embryos during development at 15 °C increases gradually cleavage (0.25 μl O2/h embryo) more rapidly neurula postneurula stages (0.60 0.90 μl value 1.20 μl embryo vitelline circulation. cold-adapted are characterized by size, slow developmental low rate.