广州地区水栖寡毛类霍夫水丝蚓的繁殖周期

THE REPRODUCTIVE CYCLE OF AN AQUATIC OLIGOCHAETE,LIMNODRILUS HOFFMEISTERI CLAPAREDE,IN GUANGZHOU

对产于亚热带地区广州的霍夫水丝蚓的繁殖周期作了13个月的观察,结果表明其繁殖高峰出现在2至4月份,较产于欧洲者提前2至3个月.根据所得数据,使用了时间序列分析法对其繁殖过程作了预测,同时测量了生殖鞘长度,未发现与繁殖周期有直接的关系.

The reproductive cycle,estimated by the percentage of penis sheath of the adult Limnodrilus hoffmeisteri,was observed for 13 months in Guangzhou,a sub-tropic region in southern China. In hot summer season the reproductive ratio was low and increased gradually thereafter.The highest peak appeared from Febraury to April,which was 2 to 3 months carlier than that in Eurou- pean regions.The time series analysis was applied to the data and a formula was established.No direct coorelation was found between the size of penis sheath and the reproductive ratio.