河川におけるセキレイ類の順位性
1986 年 35 巻 2-3 号 p. 79-80
詳細
1986 年 35 巻 2-3 号 p. 79-80
A dominance hierarcy of Motacilla wagtails (M. grandis, M. alba, and M. cinerea) and Water Pipits (Anthus spinoletta) was investigated on a stream in Utsunomiya, central Japan, in the winters of 1981-1983. An almost linear hierarchy existed among the species and between sexes, with ranking (most to least dominant) as follows: male M. grandis, female M. grandis, male M. alba, female M. alba, M. cinerea, and A. spinoletta. The proportion of victories by dominants was 100% except for a few encounters (5.7%) between female M. grandis and male M. alba. Dominance status was not necessarily related to their body sizes. Male M. grandis chased the other species more severely and more frequently than the others did.
