Abstract: This study aimed to explore the effects of competitive interference under mixed species housing conditions on the reproductive behavior of Whooper Swans（Cygnus cygnus）at Guangzhou Zoo. The study population consisted of 16 individuals（11 females and 5 males）in Yanming Lake of Guangzhou Zoo. Their behavioral rhythms were analyzed. A control group（exposed to competitive interference，2 females and 2 males）and an experimental group（competitive interference excluded，2 females and 2 males）were established. Data on reproductive behaviors were obtained through field observation and collection，and the effects of competitive interference on the reproductive behavior of Whooper Swans were compared and analyzed. The results showed that no reproductive behavior occurred in the control group，whereas a complete reproductive behavior chain was observed in the experimental group. In the control group，vigilance behavior was highly synchronized with food competition（r=0.842，P=0.001），the behavioral rhythm passively adapted to disturbances，and an effective sex?based division of labor was not established. In contrast， the experimental group exhibited a stable behavioral rhythm，with females dominating reproductive activities and males taking charge of vigilance. Food competition was the most widespread type of interferenceand a key factor inhibiting reproductive behavior （r=- 0.745，P=0.005）. The findings provide a reference for promoting natural reproduction of Whooper Swans at Guangzhou Zoo.

Key words: Cygnus cygnus；Competitive interference；Reproductive behavior

摘要： 该研究旨在探究混养条件下竞争干扰对大天鹅（Cygnus cygnus）繁殖行为的影响。 以广州动物园雁鸣湖的大天鹅种群（共16只，11雌5雄）为研究对象，分析其行为节律，并设置 对照组（存在竞争干扰，2雌2雄）和试验组（排除竞争干扰，2雌2雄），通过实地观察收集数 据，分析竞争干扰对大天鹅繁殖行为的影响。结果表明：对照组未出现繁殖行为，而试验组呈 现完整繁殖行为。对照组警戒行为与食物竞争高度同步（r=0.842，P=0.001），行为节律被动适 应干扰，且未能建立有效性别分工；试验组则形成稳定行为节律，雌性主导繁殖、雄性负责警 戒。食物竞争是影响最广泛的竞争干扰因子，是抑制繁殖行为的关键因子（r=-0.745，P= 0.005）。研究结果可为广州动物园大天鹅的自然繁殖管理提供参考依据。

关键词: 大天鹅；竞争干扰；繁殖行为