Effects of Progesterone, Testosterone, and Estrogen on Sexual Reproduction of the Rotifer Brachionus calyciflorus

摘要: It is known that some vertebrate reproductive hormones have effects on rotifer reproduction, but little about their in combination. This motivated us to examine the of waterborne progesterone (P), testosterone (T), and estradiol (E) reproduction Brachionus calyciflorus, comparing exposures single mixtures with a total concentration 1000 μg/L. Asexual population growth (r) was high all treatments, ranging from 1.28 1.43 d–1 (P-E), 0.99 1.22 (P-T). These results indicate E, P, or T alone, combinations P-E P-T totaling µg/L, 3-way combination P-E-T at 1200 µg/L do not reduce asexual B. calyciflorus. However, significant were detected sexual exposure these hormone concentrations. Exposure μg/L decreased resting egg production significantly. Analysis mating indicated fertilization 5.3 times higher control than treatments where females exposed 500 each P-T. A similar result observed when both males When alone treated P-T, there no difference male fertility compared control. suggest calyciflorus uses oxidized sterols P regulate compounds interferes production. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)