Arid
DOI10.1890/08-0405.1
Population dynamics of two sympatric rodents in a variable environment: rainfall, resource availability, and predation
Previtali, M. Andrea1; Lima, Mauricio2; Meserve, Peter L.1; Kelt, Douglas A.3; Gutierrez, Julio R.4,5,6
通讯作者Previtali, M. Andrea
来源期刊ECOLOGY
ISSN0012-9658
出版年2009
卷号90期号:7页码:1996-2006
英文摘要

Precipitation plays an important role in the dynamics of species found in arid and semiarid environments. However, population fluctuations generally are driven by a combination of multiple factors whose relative contribution may vary through time and among species. We monitored fluctuations of species in three trophic levels for >17 years at a semiarid community in north-central Chile. The region is strongly affected by the El Nino Southern Oscillation, resulting in high variation in rainfall that triggers dramatic changes in food resource availability, with strong effects on upper trophic levels. We focused our analyses on the role played by endogenous and exogenous (climatic) factors on the dynamics of two important rodent species in the community, Octodon degus and Phyllotis darwini. We documented population fluctuations of several orders of magnitude in response to wet and dry episodes of different strength and duration. P. darwini reached similar maximum densities, regardless of the duration of high-rainfall events, whereas O. degus showed additive effects of multiple wet years. Time series diagnostic tools revealed oscillations with a 5-year periodicity in rainfall, which may be the cause of the same periodicity and a weak second-order signal observed in the rodent dynamics. However, the dynamics of both rodent species were dominated by strong first-order processes, suggesting an important role of direct density dependence. Intraspecific competition, expressed as the ratio of rodent density/rainfall (or food resources) explained more than two-thirds of the variation in the population rate of change, whereas less than one-third was explained by lagged rainfall (or food resources). We detected no significant effects of predation. Our results contribute to a growing number of examples of dynamics governed by the combined effect of density dependence and climatic forcing. They also reveal strong bottom-up regulation that may be common in other arid environments.


英文关键词bottom-up regulation density dependence El Nino ENSO north-central Chile Octodon degus Phyllotis darwini population dynamics predator-prey interactions semiarid habitat sympatric rodent species time series
类型Article
语种英语
国家USA ; Chile
收录类别SCI-E
WOS记录号WOS:000267745800027
WOS关键词DELAYED DENSITY-DEPENDENCE ; WESTERN SOUTH-AMERICA ; NORTH-CENTRAL CHILE ; SMALL MAMMALS ; EL-NINO ; SEMIARID CHILE ; CLIMATE-CHANGE ; LONG-TERM ; TIME-SERIES ; SOAY SHEEP
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/160399
作者单位1.No Illinois Univ, Dept Biol Sci, De Kalb, IL 60115 USA;
2.Pontificia Univ Catolica Chile, Dept Ecol, CASEB, Santiago, Chile;
3.Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, Davis, CA 95616 USA;
4.Univ La Serena, Dept Biol, La Serena, Chile;
5.Univ La Serena, Ctr Estudios Avanzados Zonas Aridas, La Serena, Chile;
6.Univ Chile, Inst Ecol & Biodiversidad, Santiago, Chile
推荐引用方式
GB/T 7714
Previtali, M. Andrea,Lima, Mauricio,Meserve, Peter L.,et al. Population dynamics of two sympatric rodents in a variable environment: rainfall, resource availability, and predation[J]. University of California, Davis,2009,90(7):1996-2006.
APA Previtali, M. Andrea,Lima, Mauricio,Meserve, Peter L.,Kelt, Douglas A.,&Gutierrez, Julio R..(2009).Population dynamics of two sympatric rodents in a variable environment: rainfall, resource availability, and predation.ECOLOGY,90(7),1996-2006.
MLA Previtali, M. Andrea,et al."Population dynamics of two sympatric rodents in a variable environment: rainfall, resource availability, and predation".ECOLOGY 90.7(2009):1996-2006.
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