Acta Arachnologica
Online ISSN : 1880-7852
Print ISSN : 0001-5202
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22 巻 , 2 号
選択された号の論文の4件中1~4を表示しています
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  • Jun-ichi AOKI
    22 巻 (1969) 2 号 p. 27-30
    公開日: 2008/12/19
    ジャーナル フリー
  • Kazuyoshi MIYASHITA
    22 巻 (1969) 2 号 p. 31-34
    公開日: 2008/12/19
    ジャーナル フリー
    Plexippus setipes was reared under constant temperature (27-28°C) and photo-peried (16 hours each day), and the following results was obtained.
    1. The spiders moulted 5 to 6 times before they reached adulthood.
    2. Durations of days in each instar were greatly affected by the food condition, the duration was shortened when feeding interval became short.
    3. Total number of days required for the development from the first instar to adult was 110-200 days, excepting the period of immature nymphal stage staying in egg-sac.
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  • 本田 重義
    22 巻 (1969) 2 号 p. 35-39
    公開日: 2008/12/19
    ジャーナル フリー
    HONDA, Shigeyoshi (Department of Zoology, Faculty of Science, Kyoto Uni-versity) On the method for quantitive analysis of web spider community (I), Ranks of dominancy among species in a community.
    A method for finding out the dominant species in a web spider community based on the line transect sampling was proposed.
    The rank of dominancy is estimated from the relative size of the mean space occupied by each species in unit space surveyed (1m in width, 5m in height and 1m in distance) along a survey route. The mean space occupied by a species (Os) is obtained by:
    OS=OI•DS where OI and Ds are the mean value of individual space occupation and mean number of individuals per 1m3 respectively.
    As a convenient method, the index method was also proposed in which the index of specific space occupation (IOS), instead of Os, obtained by the following formula is used:
    IOS=IOI+IDS where IOI=log OI and IDS=log DS=0.699 (NSC-8) in which NSC is the density class taking the unit based on the logarithm of the population density.
    As a result of application the method to the web spider community in an artificial forest of Cryptomeria, the ranks of dominancy of the species in this com-munity were estimated as: (1) Nephila clavata, (2) Cyclosa sedeculata, (3) Theridion takayense, etc.
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  • 浜村 徹三
    22 巻 (1969) 2 号 p. 40-50
    公開日: 2008/12/19
    ジャーナル フリー
    1. 宇都宮地方の水田で,ウンカ,ヨコバイ類の天敵として働いているクモ類を知るため, 1966年から1968年までの3年間,クモ類の個体数を調査した.
    2. 水田内で生息が確認されたクモ類は14科38種であり,個体数の多いクモは,ニセアカムネグモ,キバラ劉クグモ,ヤホシヒメグモ,ハマキフクログモ,ヤマトコノパグモ,ヤサガタアシナガグモ,セスジアカムネグモ,アゴブトグモであった.
    3. クモ類全体の生息密度は田植え直後は低く,稲の生長と共に高くなり,最高密度は稲刈り期前後の10月頃に現われた.
    4. クモ類各種の密度も,ほとんどの種において, 10月に最高に達した,しかし,キバラドクグモでは, 5月頃の密度がある程度高いと8月に最高密度が現われた.
    5. 薬剤散布がよく行なわれる石井町の水田と,十分でない峰町の水田を比較すると,ほとんどのクモ類では,石井町では極端に低密度であった,しかし,キバラドクグモだけは例外で,石井町においても高い密度を示した.
    6. 当地の水田でウンカ,ヨコバイ類の天敵として,厳も役立っているクモは,率バラドクグモと考えられる.
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