Spider Fauna of Soybean Fields in Different Cultivation Environments in Aichi Prefecture

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  • 愛知県の多様な栽培環境におけるダイズほ場のクモ類
  • アイチケン ノ タヨウ ナ サイバイ カンキョウ ニ オケル ダイズ ホジョウ ノ クモルイ

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Abstract

In our research in soybean fields of different cultivation environments in Aichi prefecture for 3 years (2008-2011), 33 spider species from 11 families were identified by net sweeping and pitfall trapping. In comparison with other overall spider fauna in Japanese cultivated fields (mainly paddy), the population densities in Aichi soybean fields were lower, presumably because of the unstable habitat conditions created by crop rotation with rice and wheat, intertillage cultivation, and surface irrigation. The most abundant species collected by net sweeping were Coleosoma octomaculatum (Boesenberg and Strand) and Tetragnatha eaudicula (Karsch), and Pardosa pseudoannulata (Boesenberg and Strand) by pitfall trap; these are common species in paddy fields, and might be playing important roles as predatory natural enemies in soybean fields with adjacent or neighboring paddy fields. A brief analysis of population regulation of soybean spiders indicated no strong relationship between the number of spiders and cultivation factors (i.e., dosage of pesticide applications, overall growth of soybeans, differences in cultivation methods, etc.), and comprehensive evaluation revealed little correlation (R2=0.0907) between cultivation environment in soybean fields and the number of spiders.

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