大苇莺种群繁殖生态初步研究

THE BREEDING ECOLOGY OF GREAT REED WARBLER

Field work was carried out from 1985-1987 at the South suburb of Taiyuan, Shanxi provice.The study site is a drainage channel where the cattaill (Typha latif-olia)and the reed (Phamites communis)are living.The Great Reed Warbler (Acrocep-halus arundinaceus) arrives at this breeding area in middle May and leaves in middle September.The egg-laying period extended between early June and late July, with a peak in middle June. The clutch-size of this species ranged from 2 to 7 eggs and the mean clutch-size was 4.53 eggs. There was seasonal change in mean clutch-size, dccreaasing gradually with the season progress. The losses of eggs and nestlings were 25.71-76.32% and 18.18-37.50% respectively, excluding 5.77-9.95% of the losses caused by the Cuckoo brood parasitism. Percentage of reproduction success and productivity were lower than 51.8% and 1.9, respectively. Human activily was an important factor to affect breeding success.