A Paradigm for Population Analysis of Long-Lived Vertebrates

Eberhardt, L. L.

doi:10.2307/3072020

Cited by 143 publications

(215 citation statements)

References 15 publications

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“…Eberhardt (1977) initially proposed and then supported (Eberhardt 2002) a general rule in long-lived, age-structured populations, that an increase in density generates ''an apparent sequence of changes in vital rates'' (Eberhardt 2002). Eberhardt (1977) initially proposed and then supported (Eberhardt 2002) a general rule in long-lived, age-structured populations, that an increase in density generates ''an apparent sequence of changes in vital rates'' (Eberhardt 2002).…”

Section: Discussionmentioning

confidence: 99%

“…This method undoubtedly will have a major impact on research identifying the strength of density-dependent processes, especially in iteroparous species. Different vital rates respond to an increase in density at different rates (Eberhardt 1977, Albon et al 2000, 2002: the age at first reproduction responds to density dependence before fecundity and juvenile survival, which in turn respond to density dependence before adult survival (Eberhardt 2002). Corresponding Editor: J. M. Fryxell. 3 E-mail: tnc20@cam.ac.uk es of a change in population density.…”

Section: Introductionmentioning

confidence: 99%

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The Demographic Consequences of Releasing a Population of Red Deer From Culling

Coulson

Guinness

Pemberton

et al. 2004

Ecology

141

165

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A change in population density can generate spatial and demographic effects that can have an impact on fluctuations in population size for many years. Although the demographic effects of time lags have been incorporated into analyses of time series data, there are few detailed descriptions of the long-term demographic consequences of a change in density. We use detailed, individual-based data from a population of red deer (Cervus elaphus) from the North Block of the Isle of Rum, Scotland, to describe long-term demographic and spatial effects of a change in density. The population was released from hunting pressure in 1972. Over the following 10 years population density doubled and, since the early 1980s, has fluctuated around ecological carrying capacity. The cessation of culling led to long-term transient spatial and demographic effects that have persisted for 30 years. Different vital rates responded to the increase in density at different rates, causing long-term changes to the demographic and spatial structure of the population. These changes altered the impact of different age-and sex-specific vital rates on annual changes in population size. These changes are still ongoing, 30 years after cessation of the cull, suggesting that a change in density may generate transient dynamics that persist for several generations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Demographic Consequences of Releasing a Population of Red Deer From Culling

Coulson

Guinness

Pemberton

et al. 2004

Ecology

141

165

View full text Add to dashboard Cite

show abstract

“…Our interest in reproduction is because of its importance as an attribute of health (i.e. reproduction may be suppressed or cease when health is compromised) and biological fitness in individual animals (Eberhardt, 2002; Zedrosser et al ., 2013), and because it is required as a measurement to estimate reproductive rates at the population level (Garshelis et al ., 2005). Our specific research objectives were to:

Develop laboratory procedures and establish performance specifications to quantify reproductive steroid hormone (testosterone, progesterone, estradiol) concentrations in brown bear hair.

Determine if the hair concentrations of reproductive hormones, as well as cortisol, another steroid hormone, are correlated with each other.

Evaluate if the method of hair collection, plucked which provides samples that include follicles, or shaved which provides samples composed only of hair shafts, is related to the concentrations of reproductive hair hormones in a consistent manner (e.g.

…”

Section: Introductionmentioning

confidence: 99%

The quantification of reproductive hormones in the hair of captive adult brown bears and their application as indicators of sex and reproductive state

Cattet

Stenhouse

Janz

et al. 2017

Conservation Physiology

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“…Despite its apparent recovery, demographic and behavioral anomalies in this population indicate stresses; density dependent mechanisms that regulate populations are not operating as expected [25], [26]. As the population continues to grow, density dependence will undoubtedly increase, but whether this will take the form of a decline in fertility or a further increase in mortality is not clear.…”

Section: Discussionmentioning

confidence: 92%

Unexpected Demography in the Recovery of an Endangered Primate Population

Strier

Ives

2012

PLoS ONE

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Assessments of the status of endangered species have focused on population sizes, often without knowledge of demographic and behavioral processes underlying population recovery. We analyzed demographic data from a 28-year study of a critically endangered primate, the northern muriqui, to investigate possible changes in demographic rates as this population recovered from near extirpation. As the population increased from 60 to nearly 300 individuals, its growth rate declined due to increased mortality and male-biased birth sex ratios; the increased mortality was not uniform across ages and sexes, and there has been a recent increase in mortality of prime-aged males. If not for a concurrent increase in fertility rates, the population would have stabilized at 200 individuals instead of continuing to grow. The unexpected increase in fertility rates and in adult male mortality can be attributed to the muriquis’ expansion of their habitat by spending more time on the ground. The demographic consequences of this behavioral shift must be incorporated into management tactics for this population and emphasize the importance of understanding demographic rates in the recovery of endangered species.

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A Paradigm for Population Analysis of Long-Lived Vertebrates

Cited by 143 publications

References 15 publications

The Demographic Consequences of Releasing a Population of Red Deer From Culling

The Demographic Consequences of Releasing a Population of Red Deer From Culling

The quantification of reproductive hormones in the hair of captive adult brown bears and their application as indicators of sex and reproductive state

Unexpected Demography in the Recovery of an Endangered Primate Population

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