Cochran R C, Zabludoff S D, Paynter K T, DiMichele L, Palmer R E
Johns Hopkins University Chesapeake Bay Institute, Shady Side, Maryland 20764.
Gen Comp Endocrinol. 1988 May;70(2):345-54. doi: 10.1016/0016-6480(88)90154-2.
Daily collections of the mummichog, Fundulus heteroclitus, from field populations during the first 45 days of the breeding season revealed a semilunar cycle in the sperm index. Peaks in the sperm index were preceded by 6 days with peaks in the serum testosterone concentration. Bihourly sampling of field populations during a 72-hr period at the new moon showed both diel cycling and an upward trend in serum progesterone levels in female mummichogs. Male mummichogs had 12-hr cycles in serum 17 beta-hydroxy-4-androstene-3,11-dione levels, the peaks of which preceded high tide by 4 hr. The physiological significance of these cycles are discussed.
在繁殖季节的前45天，每天从野外种群采集底鳉（Fundulus heteroclitus），结果显示精子指数呈半月周期。精子指数峰值出现前6天，血清睾酮浓度出现峰值。在新月期间的72小时内，对野外种群进行每两小时一次的采样，结果显示雌性底鳉的血清孕酮水平既有昼夜循环，也呈上升趋势。雄性底鳉血清17β-羟基-4-雄烯-3,11-二酮水平呈12小时周期，其峰值比高潮提前4小时。文中讨论了这些周期的生理意义。
