大鸨繁殖期活动时间预算和日节律

2000和2001年的4～7月连续两年，在内蒙古自治区科尔沁右翼前旗东南部的草原上，采用野外直接观察法对野生大鸨的活动时间预算和日节律进行了研究。结果表明，大鸨繁殖期的各种行为活动具有一定的时间分配，其时间预算存在着性别间的差异，同时随活动空间大小、食物条件以及繁殖阶段的不同而变化，在繁殖前期，大鸨的时间预算以取食、休息、行走、观察为主要行为，雄鸨和雌鸨的这4种行为分别占全部行为的87％和93％；到繁殖后期，雌鸨各种行为的时间和强度发生较大变化。大鸨在取食、休息和炫耀等行为上都存在不同程度的日节律，取食和炫耀出现两次高峰，中午大部分时间大鸨处于静栖休息状态。

Behaviors time budget and daily rhythm of great bustard in breeding season

The direct observation method was adopted to study the breeding behaviors time budget and daily rhythm of wild great bustard (Otis tarda ) on the grassland of Southeast Keyouqianqi in Inner Mongolia Municipality during the period from April to July in 2000 and 2001. The results showed that the behaviors time budget of great bustard were regularly in some degree, and there exited differences between male and female. The behaviors changed with the changes of activity space, food conditions and breeding stages. During breeding prophase, great bustard spent its time mainly on feeding, relaxing, walking and observing, and the male and female spent 87% and 93% of the time on the 4 behaviors, respectively. The time budget and intensity of male and female changed greatly during the breeding anaphase. The great bustard had a daily rhythm on feeding, relaxing and displaying, and there were two peaks on feeding and displaying. The great bustard spent most time on relaxing.