天目溪非繁殖期小䴙䴘集群行为研究

Study on the Flocking Behavior of Tachybaptus ruficollis in Tianmu River During Non-Breeding Period

为了阐明天目溪小䴙䴘Tachybaptus ruficollis的集群规律和生存对策,2019年10月—2020年3月采用样线法对其非繁殖期的集群行为展开研究。结果表明,非繁殖期小䴙䴘平均每群有4.21只±0.70只,2只/群的最多,占总集群数的32.35%。小䴙䴘主要以小规模集群适应各类生态环境。各月集群规律基本上以集成1~4只/群为主,但1月主要集成1~5只/群,2月主要集成1~4只/群和20只以上的大群,说明1、2月小䴙䴘的集群处于不稳定状态。2月与其他各月之间的差异极显著(P<0.01),推测主要与温度和求偶行为等密切相关。

To clarify the flocking law and survival strategies of little grebe(Tachybaptus ruficollis),the flocking behavior of this species was studied by line transect method during the non-breeding period from October 2019 to March 2020.The results showed that the average flocking size was(4.21±0.70)individuals,with 2 individuals per flock(32.35%of the total number)as the most common flocking size.Therefore,T.ruficollis mainly lived on smaller flocking size to adapt to various ecological environments.The flocking law in each month was 1 to 4 individuals per flock.However,there were 1 to5 individuals per flock in January,and 1 to 4 or more than 20 individuals per flock in February.The flock state in February was significantly different from that in other months(P<0.01),while no significant difference was detected among other months(P>0.05).The main reason for this phenomenon might be related to the temperature and courtship behavior.