Nested diets: a novel pattern of individual-level resource use

被引：77

作者：

Araujo, Marcio S. ^{[1
]}

Martins, Eduardo G. ^{[1
]}

Cruz, Leonardo D. ^{[1
]}

Fernandes, Fernanda R. ^{[1
]}

Linhares, Aricio X. ^{[1
]}

dos Reis, Sergio F. ^{[1
]}

Guimaraes, Paulo R., Jr. ^{[2
,3
]}

机构：

[1] Univ Estadual Campinas, Depto Parasitol, Inst Biol, BR-13083970 Campinas, SP, Brazil

[2] Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Santa Cruz, CA 95064 USA

[3] Univ Sao Paulo, Depto Ecol, Inst Biociencias, BR-05508900 Sao Paulo, Brazil

来源：

OIKOS | 2010年 / 119卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

NICHE VARIATION HYPOTHESIS; INTRASPECIFIC COMPETITION; DISRUPTIVE SELECTION; PREY SELECTION; TRADE-OFFS; FEEDING SPECIALIZATION; PUMPKINSEED SUNFISH; AFRICAN FINCH; POPULATION; POLYMORPHISMS;

D O I：

10.1111/j.1600-0706.2009.17624.x

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Many generalist populations may actually be composed of relatively specialist individuals. This 'individual specialization' may have important ecological and evolutionary implications. Although this phenomenon has been documented in more than one hundred taxa, it is still unclear how individuals within a population actually partition resources. Here we applied several methods based on network theory to investigate the intrapopulation patterns of resource use in the gracile mouse opossum Gracilinanus microtarsus. We found evidence of significant individual specialization in this species and that the diets of specialists are nested within the diets of generalists. This novel pattern is consistent with a recently proposed model of optimal foraging and implies strong asymmetry in the interactions among individuals of a population.

引用

页码：81 / 88

页数：8

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