Abstract: In this paper, the Qingdao and Wuhu strains of Brachionus calyciflorus were cultured at 20 ℃, 25 ℃ and 30 ℃, and fed with 1.0×10⁶ and 5.0×10⁶ cells·ml^-1 of Scenedesmus obliquus. The morphological study of their produced resting eggs showed that at the two food concentrations, the resting eggs produced at 20 ℃ were the largest in length, width and volume, while those produced at 25 ℃ and 30 ℃ were the smallest. The effects of strain on the morphological characteristics of resting eggs also depended on food concentration. When the food concentration was 1.0×10⁶ cells·ml^-1, the length, width and volume of the resting eggs produced by Wuhu strain and Qingdao strain were 156.00 μm, 99.95 μm and 12 269.11 μm3, and 145.13 μm, 91.97 μm and 10 498.19 μm³, respectively, while when the food concentration was 5.0×10⁶ cells·ml^-1, the corresponding values were 155.68 μm, 100.85 μm and 12 348.59 μm³, and 156.63 μm, 98.04 μm and 12 05420 μm³, respectively. For test strains, only Wuhu strain showed a marked curvilinear correlation in the length, width and volume of its resting eggs with temperature. At the same temperature, the volumes of the resting eggs produced by both Qingdao and Wuhu strains were increased with increasing food concentration, with the exception that the resting eggs produced by Wuhu strain at 30 ℃ decreased with increasing food concentration.

Key words: Stomatal conductance, Aneurolepidium chinense, Conductance simulation