The ingestion in wolf spiders I. Capacity of gut ofLycosa pseudoannulata |
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Authors: | Kazuo Nakamura |
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Institution: | (1) Division of Entomology, National Institute of Agricultural Sciences, Tokyo, Japan |
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Abstract: | Summary An wolf spider,Lycosa pseudoannulata, collected from the field were reared in test tubes supplied with fruit flies as the food, and the number and weight of fruit
flies killed per unit time and the weight of residuum of killed flies were recorded. When the cumulative number of flies killed
by a spider was plotted against time after the beginning of food supply, the angle of the curve obtained decreased gradually
until a constant value. In this time, it seems that the gut of spider had saturated with food and the increase rate of number
of flies killed reflects the rate of food disappeared from gut by assimilation and egestion. The amount of ingestion was obtained
by subtracting the weight of residuum and the gain of live weight of the spider from the weight of killed flies. After the
gut has saturated, the amount of food remained in the gut is considered to be equal to the capacity of gut, which is an essential
factor in the study of predation. The amount of food disappearance from gut was also estimated.
There was a linear relationship between the log body weight of spiders and the log capacity of gut. The linear relationship
was also seen between the log total amount of ingestion and the log total amount of food disappeared from gut. |
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Keywords: | |
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