Factors affecting offspring number of Japanese foliage spider, Cheiracanthium lascivum (Araneae: Clubionidae)

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  • 菊池 知子
    金沢大学大学院自然科学研究科生物学科生態学研究室
  • 大河原 恭祐
    金沢大学大学院自然科学研究科生物学科生態学研究室

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Other Title
  • 卵塊保護行動を行うヤマトコマチグモＣｈｅｉｒａｃａｎｔｈｉｕｍ　ｌａｓｃｉｖｕｍの産卵数に影響を与える要因
  • ランカイ ホゴ コウドウ オ オコナウ ヤマトコマチグモ Cheiracanthium lascivum ノ サンランスウ ニ エイキョウ オ アタエル ヨウイン

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Abstract

The breeding season and the factors affecting fertility of Japanese foliage spider, Cheiracanthium lascivum, were investigated in Kanazawa City of central Japan. In grasslands of three study sites, Asano, Tawara, and Katano, the nests made of leaves of perennial grasses were collected from late May to July. A total of 167 nests were collected, and 83 of them (49.7%) included a single adult female with an egg sac or spiderlings. The females attended their offsprings within the nests, but matriphagy, which is known in a congeneric species, C. japonicum, was not found. Average number of offsprings (eggs or spiderlings) per nest was 143.6±5.5 (SE). It was significantly different among the study sites, and the largest number was produced in Katano. The multiple regression analysis showed that the offspring number was positively correlated with the cephalothorax width of female spider in Asano and with the nest size in Katano. These results suggest that the offspring number in this spider is affected by the female size or the nest size, probably depending on environmental factors.

Journal

  • Acta Arachnologica

    Acta Arachnologica 56 (2), 91-95, 2007

    Arachnological Society of Japan

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