PREY ABUNDANCE VS DIET BREADTH IN A SPIDER TEST SYSTEM

被引：55

作者：

RIECHERT, SE

机构：

[1] Department of Zoology and Graduate Program in Ecology, University of Tennessee, Knoxville, 37996-0810, TN

来源：

EVOLUTIONARY ECOLOGY | 1991年 / 5卷 / 03期

关键词：

DIET CHOICE; SPIDERS; PREDATION RISK; PREY BEHAVIOR; ECOTYPES; FORAGING; DESERT;

D O I：

10.1007/BF02214236

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

'Decisions' made as to what prey types to include in the diet were analysed for two populations of the spider, Agelenopsis aperta existing under markedly different prey availability and predation levels. Potential prey types were ranked as to their relative profitabilities with respect to energy gain per handling effort and predation risk. Members of the population experiencing limited prey availability but low risk of predation to visually hunting predators exhibited a significantly higher capture attempt rate towards all prey encountered than the population for which prey were abundant but for which predation was a significant problem. Neither spider population preferentially attacked prey that exhibited higher profitability rankings. An experiment was completed that indicates that A. aperta can discriminate between more and less profitable prey. Suggestions are made as to why the population experiencing abundant food did not exhibit a narrower diet when compared to the population existing under limited food.

引用

页码：327 / 338

页数：12

共 27 条

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