Age-Specific Demography in Plantago: Uncovering Age-Dependent Mortality in a Natural Population

Accurate measures of age-dependent mortality are critical to life-history analysis and measures of fitness, yet these measures are difficult to obtain in natural populations. Age-dependent mortality patterns can be obscured not only by seasonal variation in environmental conditions and reproduction...

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Bibliographic Details
Published in:The American naturalist 2004-07, Vol.164 (1), p.60-69
Main Authors: Roach, Deborah A., Gampe, Jutta
Format: Article
Language:English
Subjects:
Botany
Demographics
Demography
Longitudinal Studies
Mortality
Plant growth
Plant populations
Plantago - growth & development
Plantago lanceolata
Regression analysis
Reproduction
Risk Factors
Seasons
Selection, Genetic
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Summary:Accurate measures of age-dependent mortality are critical to life-history analysis and measures of fitness, yet these measures are difficult to obtain in natural populations. Age-dependent mortality patterns can be obscured not only by seasonal variation in environmental conditions and reproduction but also by changes in the heterogeneity among individuals in the population over time due to selection. This study of Plantago lanceolata uses longitudinal data from a field study with a large number of individuals to develop a model to estimate the shape of the baseline hazard function that represents the age-dependent risk of mortality. The model developed here uses both constant (genetics, spatial location) and time-varying (temperature, rainfall, reproduction, size) covariates not only to estimate the underlying mortality pattern but also to demonstrate that the risk of mortality associated with fitness components can change with time/age. Moreover, this analysis suggests that increasing size after reproductive maturity may allow this plant species to escape from demographic senescence.
ISSN:0003-0147
1537-5323
DOI:10.1086/421301