オヽヨシキリAcrocephalus stentoreus orientalis TEMMINCK & SCHLEGELの生態とくにpolygyneousな1例の生活史について (予報).

概要

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As a preliminary report of the comprehensive studies on the ethology of the Eastern Great Reed Warbler, the present paper deals mainly with the; life-history of a polygyneous family to illustrate its extreme polygyny and the fact that, in spite of this peculiarity, the breeding activity of this family represents fairly well the general seasonal trend of the species near Sapporo. Since the arrival of the male on May 23,1956 to the last record of fledglings on Aug. 20,the area shown in Fig. 1,was occupied by a polygyneous family, which consisted of 1 male and 5 females. Because of the sedentary nature characteristic of the species, the majority of various activities of these individuals was performed inside the area as summarized in Figs. 1 and 2. All the females except IV successfully reared their offspring. No remarkable relation was found among the females except for the attack of others by the nest owner when they approached too near to the nest area. The male participated neither in the nest building, nor in any practical sense, in the feeding. His role was directed mostly to the defense of the area against other conspecific individuals and cuckoos. The persistent attempt of one strange male to intrude into the area was traced and illustrated in Fig. 3. Furthermore, some considerations were given with respect to the occurrence of polygyny in this species.
日本生態学会の論文
1957-12-31