首页   按字顺浏览 期刊浏览 卷期浏览 Time and Resource Partitioning inStethorus punctum(Coleoptera: Coccinellidae)
Time and Resource Partitioning inStethorus punctum(Coleoptera: Coccinellidae)

 

作者: M. A. Houck,  

 

期刊: Environmental Entomology  (OUP Available online 1991)
卷期: Volume 20, issue 2  

页码: 494-497

 

ISSN:0046-225X

 

年代: 1991

 

DOI:10.1093/ee/20.2.494

 

出版商: Oxford University Press

 

关键词: Insecta;prey preferences;resource partitioning;Stethorus punctum

 

数据来源: OUP

 

摘要:

Stethorus punctum(LeConte) is an obligate predator of tetranychid mites. Laboratory studies examined the proportion of time beetles spent searching, feeding, and resting when adult females and third instars encountered an abundance of all instars of the tetranychid miteTetranychus urticaeKoch. Preference for various prey instars, relative handling times, and the influence of starvation on these behaviors were determined. Satiated female beetles spent 45.1% of their time searching, 14.4% feeding, and 40.5% resting. Female beetles that were starved spent a greater proportion of time feeding, with an increase in handling time per prey. The increase in handling time was due to a more complete extraction of body fluids from individual prey. Female beetles preferred mite eggs, and that preference was not significantly altered by starvation. Satiated larvae spent 78.4% of their time searching and 21.6% feeding; they did not spend any measurable amount of time resting. Starvation of larvae significantly increased the percentage of time spent feeding and the handling time per prey. Third instars preferred nymphal mite stages to other instars, and this preference was not significantly altered by starvation. The results are discussed in reference to predator–prey dynamics.

 

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