文章基本信息

标题：Influence of intraspecific competition for food on the bodyweight of the adult aphidophagous ladybird, Coccinella transversalis
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作者：Ahmad Pervez ; Rupali Sharma
期刊名称：European Journal of Environmental Sciences
印刷版ISSN：2336-1964
出版年度：2021
卷号：11
期号：1
页码：5-11
DOI：10.14712/23361964.2021.1
语种：English
出版社：Institute for Environmental Studies
摘要：Aggregation of conspecific predators sharing a common prey, influences their bodyweights. We investigated the influence of intraspecific competition of adult ladybirds of Coccinella transversalis Fabricius on their bodyweight feeding on rusty plum aphid, Hysteroneura setariae (Thomas). Adult males and females consumed a significantly greater number of aphids with increase in predator-density, however, the aphid-consumption per predator declined with this increase. The weight gain per predator also decreased linearly with increase in the density of both male and female predators. This indicates that the weight-gain of the predator is a function of the prey consumed. The searching efficiency decreased with increase in predator density due to mutual inference. The mutual interference constants for adult male and female ladybirds were −0.419 and −0.546, respectively. The females consumed a greater number of aphids than males. The killing power of the ladybird denoted by the k-value increased curvilinearly with increase in predator density. We conclude that prey consumption is a function of body size and that the offspring of those that aggregate at low densities in prey-rich habitats develop into large adults.