Ecological studies of Pirata subpiraticus (BOESENBERG et STRAND) (Araneae: Lycosidae) I
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概要
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In order to make clear the life history of Pirata subpiraticus, surveys in paddy fields were carried out from 1967 to 1968 at Utsunomiya, Tochigi Pref. The spiders that collected from paddy fields were preserved in 70%, methyl alcohol and the widths of the carapace were measured by means of an ocular mi-crometer (unit=0.05mm). Eggs in egg-sacs held by adult females were counted. P. subpiraticus overwintered under the soil of paddy fields in the immature forms of various stages ranging from hatching larvae to subadults. The instars of these larvae were however impossible to discriminate by the pattern of frequency distribution of the width of the carapace and its length (Fig. 1). The adults formed two peaks of occurrence a year, the first in early July and the second in early August (Fig. 3). In the adult females the carapace widths were over 2.0mm in the majority of the specimens collected before July, whereas those were under 2.0mm in 80% of the specimens collected after August (Fig. 4). On the adult males, the same tendency was recongnized (Fig. 5). From these results it was estimated that the adults emerged before July were of the overwintering generation and those after August were of the next genera. tion (summer generation). Number of eggs was counted for 75 egg-sacs throughout the adult emergence season. An egg-sac had about 50 eggs in average (range 12-105, Table 1). The egg-sacs before July had more eggs than those after August.
- 日本蜘蛛学会の論文
日本蜘蛛学会 | 論文
- クモ学会第38回大会(学会創立70周年記念大会)に参加して (日本蜘蛛学会第38回大会)
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