Delayed density-dependent and rainfall effects on reproductive parameters of an irruptive rodent in semiarid Chile

Lima, Maurício; Jaksic, Fabián M.

doi:10.4098/at.arch.98-19

Cited by 33 publications

(28 citation statements)

References 38 publications

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“…The ¢rst-order dynamics predicted by the matrix model are consistent with the dynamics of a linear autoregressive model ¢tted to the annual time-series of T. elegans (Lima & Jaksic 1998b. In this vein, almost all the £uctuations in the population dynamics of this species seem to be caused by the rainfall variability related to the reproduction, maturation and recruitment rates interacting with strong regulatory mechanisms (negative feedback in maturation).…”

Section: (C) Endogenous and Exogenous Dynamicssupporting

confidence: 73%

Demography and population dynamics of the mouse opossum ( Thylamys elegans ) in semi-arid Chile: seasonality, feedback structure and climate

Lima

Stenseth

Yoccoz

et al. 2001

Proc. R. Soc. Lond. B

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Here we present, to the authors' knowledge for the very ¢rst time for a small marsupial, a thorough analysis of the demography and population dynamics of the mouse opossum (Thylamys elegans) in western South America. We test the relative importance of feedback structure and climatic factors (rainfall and the Southern Oscillation Index) in explaining the temporal variation in the demography of the mouse opossum. The demographic information was incorporated into a stage-structured population dynamics model and the model's predictions were compared with observed patterns. The mouse opossum's capture rates showed seasonal (within-year) and between-year variability, with individuals having higher capture rates during late summer and autumn and lower capture rates during winter and spring. There was also a strong between-year e¡ect on capture probabilities. The reproductive (the fraction of reproductively active individuals) and recruitment rates showed a clear seasonal and a between-year pattern of variation with the peak of reproductive activity occuring during winter and early spring. In addition, the fraction of reproductive individuals was positively related to annual rainfall, while population density and annual rainfall positively in£uenced the recruitment rate. The survival rates were negatively related to annual rainfall. The average ¢nite population growth rate during the study period was estimated to be 1.011 AE0.0019 from capture^recapture estimates. While the annual growth rate estimated from the seasonal linear matrix models was 1.026, the subadult and adult survival and maturation rates represent between 54% (winter) and 81% (summer) of the impact on the annual growth rate.

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Section: (C) Endogenous and Exogenous Dynamicssupporting

confidence: 73%

Demography and population dynamics of the mouse opossum ( Thylamys elegans ) in semi-arid Chile: seasonality, feedback structure and climate

Lima

Stenseth

Yoccoz

et al. 2001

Proc. R. Soc. Lond. B

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“…Consequently, this result may be construed as supporting the hypothesis that density-dependent factors do not affect these population systems and that only densityindependent factors drive them (Meserve and Le Boulenge 19t^7, Meserve et al 1995). However, we have detected delayed density-dependent effects operating at demographic (Lima and Jaksie 1998a) and population dynamic (Lima andJaksie 1998b, 1999) levels in P. darwini. Andrewartha andBirch 1954), applied to the strong sign of precipitation infiuencing population fluctuations of rodents in semiarid Chile.…”

Section: Discussionmentioning

confidence: 66%

El Niño events, precipitation patterns, and rodent outbreaks are statistically associated in semiarid Chile

Lima¹,

1999

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laksic, F. M. 1999. El Niiio events, precipitation patterns, and rodent outbreaks are statistically associated in .semiarid Chile. -Eeography 22: 213-218.In the last two decades, several researchers have noted rodent population outbreaks in semiarid South America, in association with unusually high precipitation that seemingly concurs with El Nifio events. To date, no studies have been conducted to determine the statistical relationships between ENSO (El Nino Southern Oscillation) events, increased precipitation, and rodent irruptions. Here we show that: 1) there is a statistical association between ENSO events and inereased precipitation in the semiarid region of northern Chile: 2) the occurrence of rodent outbreaks in that region is statistically related with the precipitation levels of the same year: 3) the multi-annual patterns of the total annual precipitation levels and population abundance of those rodents during tlie summer are positively associated. The putative chain of effects seems to start with unusually high rainfall brought by ENSO to semiarid environments, which thus respond with inereased primary productivity (herbage and seeds), which then fuels the rodent outbreaks.M. Lima (mlima@ahello.dic.iichile.el).

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“…1993; Leirs et al . 1997; Lima & Jaksic 1998; Ostfeld & Keesing 2000; Davis, Pech & Singleton 2003).…”

Section: Discussionmentioning

confidence: 99%

Predation of beech seed by mice: effects of numerical and functional responses

Ruscoe

Elkinton

Choquenot

et al. 2005

Journal of Animal Ecology

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Summary 1.The functional response of post-dispersal seed predators (house mouse, Mus musculus ) to absolute densities of southern beech seed ( Nothofagus solandri var. cliffortioides ) was studied in laboratory and field trials. House mice showed a Type II (hyperbolic) functional response to seed availability and this was not modified by the presence of an alternative food source. 2. Maximum daily intake rate of beech seeds during field trials averaged 1042 seeds mouse − 1 . This is sufficient to provide house mice with both the energy and protein required for growth and reproduction. 3. We explicitly incorporated the functional response into the numerical response of house mice to beech seed, measured for field populations monitored in a New Zealand beech forest. House mice showed a strong numerical response to beech seed intake rate that was modified by some density-dependent mechanism(s). 4. We developed a model that simulated seedfall, house mouse population growth and seed reserve depletion over one year. We found that the previously reported decline in house-mouse populations in beech forests during spring and summer is likely to be related to spring beech seed germination that renders seed no longer available as a food source for house mice. 5. From our simulation model it does not appear that house-mouse populations can completely eat-out beech seed reserves prior to germination in a year of large seedfall. 'Masting' behaviour in New Zealand native beech trees is therefore sufficient to satiate an eruptive population of an exotic mammalian omnivore, despite the lack of a long co-evolutionary interaction.

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Delayed density-dependent and rainfall effects on reproductive parameters of an irruptive rodent in semiarid Chile

Cited by 33 publications

References 38 publications

Demography and population dynamics of the mouse opossum ( Thylamys elegans ) in semi-arid Chile: seasonality, feedback structure and climate

Demography and population dynamics of the mouse opossum ( Thylamys elegans ) in semi-arid Chile: seasonality, feedback structure and climate

El Niño events, precipitation patterns, and rodent outbreaks are statistically associated in semiarid Chile

Predation of beech seed by mice: effects of numerical and functional responses

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