Arid
DOI10.1890/02-0220
Who bears the costs of interspecific competition in an age-structured population?
Eccard, JA; Ylonen, H
通讯作者Eccard, JA
来源期刊ECOLOGY
ISSN0012-9658
出版年2003
卷号84期号:12页码:3284-3293
英文摘要

Social and density-dependent life history processes may differ according to age and the reproductive history of individuals. Arvicoline rodents have a typical, season-dependent, bimodal, age distribution of breeding individuals within a population. This distribution may influence population fluctuations. In this study, we measured effects of interspecific competition from field voles (Microtus agrestis) on various fitness components of female bank voles (Clethrionomys glareolus) in an age-structured breeding population in large (0.25 ha) outdoor enclosures. We monitored survival, reproduction, and space use of experimental bank vole populations with females from two different age groups. Within the enclosures we manipulated the presence and absence of field voles. When coexisting with field voles, the year-born bank vole females had lower survival rates than the over-wintered ones did. Home ranges of bank voles were smaller in the presence of field voles than in their absence. Characteristics of litters of breeding females were not affected by the competition treatment. Reproduction of the youngest of the year-born females stopped earlier in the season than for over-wintered females although both age groups had reproduced prior to the trial. We did not observe indications of senescence, such as lower reproduction or survival of the over-wintered females in late summer. An earlier cessation of breeding in the younger females suggests an age-specific trade-off of summer reproduction and winter. survival for parous females. Inter- and intraspecific competition seemed to work additively on the year-born, females through direct interference. By selectively reducing survival of younger breeders, interspecific competition could influence age distribution and population growth of breeders toward the end of the breeding season. Because old, over-wintered females are not surviving to the next noribreeding season, the lower survival of young breeders through interspecific competition might impact greatly the structure of the breeding population at the start of the next breeding season, thus altering population growth patterns.


英文关键词age structured populations bank voles bimodal age distributi6n Clethrionomys glareolus competition life history microtine rodents senescence
类型Article
语种英语
国家Finland
收录类别SCI-E
WOS记录号WOS:000187973500018
WOS关键词FEMALE BANK VOLES ; CLETHRIONOMYS-GLAREOLUS ; MICROTUS-AGRESTIS ; FIELD EXPERIMENTS ; SOCIAL-ORGANIZATION ; DENSITY-DEPENDENCE ; DESERT RODENTS ; SMALL MAMMALS ; MATURATION ; PREDATION
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/144483
作者单位(1)Univ Jyvaskyla, Dept Biol & Environm Sci, FIN-40351 Jyvaskyla, Finland
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Eccard, JA,Ylonen, H. Who bears the costs of interspecific competition in an age-structured population?[J],2003,84(12):3284-3293.
APA Eccard, JA,&Ylonen, H.(2003).Who bears the costs of interspecific competition in an age-structured population?.ECOLOGY,84(12),3284-3293.
MLA Eccard, JA,et al."Who bears the costs of interspecific competition in an age-structured population?".ECOLOGY 84.12(2003):3284-3293.
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