Population Dynamics of Indigenous Predatory Mites (Acari: Gamasina) and Their Potential Prey Saprophagous Arthropods—An Acarid Mite (Acari: Acaridae) and Springtails (Entognatha: Collembola) —in the Spinach Fields in Hokkaido

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  • Saito Miki
    Hokkaido Research Organization, Agriculture Research Department, Kamikawa Agricultural Experiment Station
  • Takaku Gen
    Hokkaido University of Education Sapporo

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  • 北海道の施設栽培ホウレンソウ圃場におけるホウレンソウケナガコナダニ，トビムシ類および土着天敵ヤドリダニ類の発生消長
  • ホッカイドウ ノ シセツ サイバイ ホウレンソウ ホジョウ ニ オケル ホウレンソウケナガコナダニ,トビムシルイ オヨビ ドチャク テンテキ ヤドリダニルイ ノ ハッセイ ショウチョウ

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Abstract

Native predatory mites (Acari: Gamasina) and saprophagous arthropods—an acarid mite Tyrophagus similis Volgin (Acari: Acaridae) and springtails (Entognatha: Collembola) —were collected from spinach-cultivated soils of 6 greenhouses located in Hokkaido at 7–10 day intervals from April to September in 2010 and 2011. Of the 16 species of predator mites collected, Ascidae sp.1, Ascidae sp.2, Hypoaspis (Gaeolaelaps) praesternalis Willmann, Macrocheles sp., Cycetogamasus diviortus (Athias-Henriot), and Parholaspulus alstoni Evans most frequently occurred. Positive correlations were observed between the population dynamics of H. praesternalis and T. similis, and that of Macrocheles sp. and springtails. Therefore, we suggest that H. praesternalis and Macrocheles sp. prey on the saprophagous arthropods T. similis and springtails, respectively.

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