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Seasonal change in fauna and abundance of spiders in a paddy field in Suweon, a district in mid Korea, was regularly investigated from June to September in 1975 by two collecting methods, viz. sucking... with an aspirator and sweeping with a butterfly net. Occasional collections of spiders were also made at several paddy fields in the south and south-western coastal regions. As the result, spiders of 12 families consisting of at least 21 species were sampled (Table 1). Comparison of the two collecting methods showed that unbiased samples of the fauna and abundance were taken by sucking, but not by sweeping which was largely effective in collecting such spiders as tetragnathids and argiopids snaring at the crown part (Table 2 and Fig. 1). Simpson’s (1949) index of diversity was applied to the data obtained by sucking in order to detect the seasonal characteristics of spider’s fauna and dominant species (Table 3). Spider’s fauna was relatively poor in early period of rice growth (June). Pirata subpiraticus (Lycosidae, hunter) and Gnathonarium dentatum and Oedothorax insecticeps (Erigonidae, snarers with a hunting habit) were the main early settlers. However, the seasonal population growth of erigonids was not remarkable compared with p. subpiraticus which was the most dominant species throughout the rice growing seasons. From July onward, spider’s fauna became rich with the invasion and population growth of later settlers. Among the later settlers, the poputation growth of Pachygnatha clercki (Tetragnathidae, hunter exceptional in this family) was most remarkable. Thus, P. subpiraticus and P. clercki seem to be most important predators or rice leafhoppers in thepaddy field.続きを見る
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