Demographic dynamics of a neotropical small rodent (Phyllotis darwini): feedback structure, predation and climatic factors
作者： Mauricio Lima , Romain Julliard , Nils CHR. Stenseth , Fabian M. Jaksic
DOI: 10.1046/J.0021-8790.2001.00536.X
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摘要: Summary 1 The leaf-eared mouse (Phyllotis darwini) exhibits large numerical fluctuations associated with high- and low-rainfall years in semi-arid Chile. Using capture–mark–recapture (CMR) statistical modelling, we provide a detailed description of the demographic variation this species. We studied between-year seasonal demography, tested for relative importance endogenous exogenous factors as covariates survival, recruitment, maturation reproduction over 12-year period. 2 The variables show larger than within-year (seasonal) variation, emphasizing source external variability. found that both feedback structure operate together on different processes species. 3 We positive direct effects survival rate negative fraction reproductive individuals female rates. The ratio between barn magellanic horned owls showed an important effect most mice, particular by influencing negatively rates individuals, thus suggesting non-lethal predation. 4 Hence, intrinsic mechanisms (density-dependence), climate (rainfall Southern Oscillation Index (SOI)) simultaneously determining demography mice. hypothesize trophic interactions (and perhaps other predators) may cause second-order responses population dynamics small rodent
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