Presaturation and saturation dispersal 15 years later: some theoretical considerations

Stenseth, Nils Chr.; LidickerJr., W. Z.

doi:10.1007/978-94-011-2338-9_9

Cited by 11 publications

(9 citation statements)

References 48 publications

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“…1999). This may be due to one of two (not mutually exclusive) causes: one is inhibition of dispersal at high densities (Lidicker 1975; Stenseth 1983; Stenseth & Lidicker 1992), and/or reduced predation through a saturation effect at high density (Julliard et al . 1999).…”

Section: Discussionmentioning

confidence: 99%

Demographic dynamics of a neotropical small rodent (Phyllotis darwini): feedback structure, predation and climatic factors

Lima

Julliard

Stenseth

et al. 2001

Journal of Animal Ecology

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Summary1. 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 in this species. We studied between-year and seasonal variation of demography, and tested for the relative importance of endogenous and exogenous factors as covariates of survival, recruitment, maturation and reproduction over a 12-year period. 2. The demographic variables studied show larger between-year than within-year (seasonal) variation, emphasizing the importance of this source of external variability. We found that both feedback structure and exogenous factors operate together on different demographic processes of this species. 3. We found positive direct feedback effects on survival rate and negative feedback on recruitment, fraction of reproductive individuals and female maturation rates. The ratio between barn and magellanic horned owls showed an important effect on most of the demographic variables of leaf-eared mice, in particular by influencing negatively survival rates and the fraction of reproductive individuals, thus suggesting the importance of non-lethal predation. 4. Hence, feedback intrinsic mechanisms (density-dependence), owls and climate (rainfall and Southern Oscillation Index (SOI)) operate simultaneously in determining the demography of leaf-eared mice. We hypothesize that trophic interactions with owls (and perhaps other predators) may cause second-order feedback responses in demography and population dynamics of this small rodent species.

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Section: Discussionmentioning

confidence: 99%

Demographic dynamics of a neotropical small rodent (Phyllotis darwini): feedback structure, predation and climatic factors

Lima

Julliard

Stenseth

et al. 2001

Journal of Animal Ecology

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“…This is, to the authors’ knowledge, the first published evidence of presaturation dispersal in bears. Unfortunately, presaturation dispersal has been defined both as dispersal occurring when population growth rates are positive, and dispersal from a place of residency before the carrying capacity has been reached (Stenseth & Lidicker 1992). The former definition came from observations of dispersal in cyclic rodents (Krebs et al .…”

Section: Discussionmentioning

confidence: 99%

“…This was first described for small mammals (Krebs et al . 1973) and has been most commonly observed in this group of mammals (Stenseth & Lidicker 1992). Sinclair (1992) expected it not to be found in large mammals, except in expanding populations, and even then it would be rare.…”

Section: Introductionmentioning

confidence: 94%

Geographic expansion of an increasing brown bear population: evidence for presaturation dispersal

Swenson

Sandegren

Söderberg

1998

Journal of Animal Ecology

206

148

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“…The most striking result was the different relation between density and survival of marked subadults and adults, and the low survival of adults compared to subadults. The positive density effect on subadult survival could originate from at least two phenomena: inhibited dispersal, and hence higher probability of persistence in the population at high density (Lidicker 1975; Stenseth 1983; Brant 1992; Stenseth & Lidicker 1992), or reduced predation rates through a saturation effect at high density. The former is not supported by observational data: the number of new individuals is usually high at high density, and between‐capture movements are small both within and between capture sessions and are not related to density (Leirs 1995; Leirs et al .…”

Section: Discussionmentioning

confidence: 99%

Survival‐variation within and between functional categories of the African multimammate rat

Julliard

Leirs²,

Stenseth

et al. 1999

Journal of Animal Ecology

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Summary 0[ By identifying ecological factors speci_c to functional categories of individuals\ it may be possible to understand the mechanisms underlying life!history evolution and population dynamics[ While empirical analyses within the _eld of population biology have focused on changes in population size\ theoretical models assuming di}erential sensitivities of population growth rate or _tness to demographic parameters have mostly been untested\ particularly against data on small mammals[ 1[ Statistical modelling of captureÐmarkÐrecapture data on the multimammate rat "Mastomys natalensis# from Tanzania shows that] "i# females survive slightly better than males and subadults survive much better than adults^"ii# temporal variation of survival of all individuals is similarly related to the rainfall of the month^"iii# subadults exhibit a strongly density!dependent low persistence rate in the population immedi! ately after their _rst capture^"iv# subadults survival in later months is\ however\ positively related to density^and "v# adult survival shows negative density!dependence[ 2[ Both density!dependent and density!independent factors simultaneously determine stage!dependent survival variation of the multimammate rat[ Whereas environmental factors in this population seem to a}ect survival rates of all individuals in a similar manner\ density!dependent relationships are more complex[ 3[ The patterns of survival variation in small mammals may be di}erent from those observed in large mammals[ 4[ Further studies of demography in small mammals should aim at understanding how much of the variability in population growth rate is accounted for by the variability of the demographic rates resulting from limiting "density!independent# and regulating "density!dependent# factors\ respectively[ This study emphasizes the use of robust and accurate statistical methods as well as stage! or age!structured population modelling[ Key!words] captureÐmarkÐrecapture statistical modelling\ density dependence\ Mas! tomys natalensis\ state!dependent life history\ tropical rodent demography[ Journal of Animal Ecology "0888#\ 57\ 449Ð450Correspondence] Nils

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Presaturation and saturation dispersal 15 years later: some theoretical considerations

Cited by 11 publications

References 48 publications

Demographic dynamics of a neotropical small rodent (Phyllotis darwini): feedback structure, predation and climatic factors

Demographic dynamics of a neotropical small rodent (Phyllotis darwini): feedback structure, predation and climatic factors

Geographic expansion of an increasing brown bear population: evidence for presaturation dispersal

Survival‐variation within and between functional categories of the African multimammate rat

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