Variability in food consumption rate of natural populations in the spider,Nephila clavata |
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Authors: | Tadashi Miyashita |
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Institution: | (1) Laboratory of Forest Zoology, Faculty of Agriculture, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan |
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Abstract: | Summary Mean daily food consumption and total lifetime food consumption of the spider,Nephila clavata, were estimated in natural populations. Daily food consumption in the late adult stage was 27–150 mg wet weight, which was
nearly equivalent or slightly larger than that in other large web-building spiders. Considerable variation in food consumption
was found among habitats or years. The largest variation among habitats in the same year was 7 and 5 fold for daily and lifetime
consumption, respectively, while that among years in the same habitat was 3.5 and 2.5 for daily and lifetime consumption,
respectively. Feeding conditions evaluated from the food consumption per body weight of spiders declined during the period
from mid-July to mid-September in almost all the populations, which suggested that they faced to severe food limitation in
this period. |
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Keywords: | spider arthropod predator food consumption food limitation |
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