Population dynamics of three Neotropical small mammals: Time series models and the role of delayed density-dependence in population irruptions

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dc.contributor.authorLima, M
dc.contributor.authorJaksic, FM
dc.date.accessioned2025-01-21T01:32:13Z
dc.date.available2025-01-21T01:32:13Z
dc.date.issued1999
dc.description.abstractIt is widely believed that only precipitation levels (through increased primary production) determine irruptions of small mammals in semi-arid areas of western South America. Nevertheless, density-dependent factors may also drive population fluctuations. To test statistically these putative effects we analysed 11 years of population records on three sympatric species of small mammals at two different habitat types in north central Chile. We applied the classical diagnostic tools of time series analysis (the autocorrelation function: ACF) to the observed time series of three neotropical small mammals. We also used simple linear autoregressive time series models to reconstruct the endogenous dynamics of these populations. The analysis strongly suggests that population fluctuations of the three species have an important density-dependent component, with the most irruptive species (Phyllotis darwini, Waterhouse 1837) displaying stronger second order population feedbacks than the other two (AKodon olivaceus, Waterhouse 1837 and Thylamys elegans, Waterhouse 1839). The latter two species showed direct density-dependent feedbacks. We hypothesize that the frequent population outbreaks of I? darwini land perhaps of other species) in semi-arid regions of western South America, may be the result of population-level (direct density-dependence) and community-level processes (delayed density-dependence), interacting with exogenous perturbations (rainfall and associated primary production).
dc.fuente.origenWOS
dc.identifier.issn0307-692X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97226
dc.identifier.wosidWOS:000078842900004
dc.issue.numero1
dc.language.isoen
dc.pagina.final34
dc.pagina.inicio25
dc.revistaAustralian journal of ecology
dc.rightsacceso restringido
dc.subjectdensity-dependence
dc.subjectoutbreaks
dc.subjectprecipitation
dc.subjectsmall mammals
dc.subjectsemi-arid region
dc.subjectChile
dc.subject.ods13 Climate Action
dc.subject.ods15 Life on Land
dc.subject.odspa13 Acción por el clima
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titlePopulation dynamics of three Neotropical small mammals: Time series models and the role of delayed density-dependence in population irruptions
dc.typeartículo
dc.volumen24
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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