A comparison between two population census methods, pitfall trapping and visual searching, for <i>Pardosa astrigera</i> (Araneae: Lycosidae) in cabbage fields

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  • キャベツほ場におけるウヅキコモリグモ（クモ目：コモリグモ科）の個体数調査における落とし穴法と見取り法の比較
  • キャベツ ホジョウ ニ オケル ウズキコモリグモ(クモモク:コモリグモカ)ノ コタイスウ チョウサ ニ オケル オトシアナホウ ト ミトリ ホウ ノ ヒカク
  • A comparison between two population census methods, pitfall trapping and visual searching, for Pardosa astrigera (Araneae: Lycosidae) in cabbage fields

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The trends of population census data of the wolf spider, Pardosa astrigera L. Koch, in cabbage fields were compared between two methods of the census: pitfall trapping and visual searching. Although there were usually no significant correlations between the data obtained either method, the number of spiders captured by pitfall trapping per trap each week and the number of spiders observed by visually searching per five meters of two cabbage rows had roughly equivalent average values through out the census period. Therefore, when estimating whether the population of spiders in cabbage fields is above a certain level, the average values of each population census method throughout the census period were comparable to each other to a certain degree.

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