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Demographic analysis from summaries of an age-structured population

Biometrics

doi: 10.1111/j.0006-341X.2003.00091.x 6230_Link.pdf
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Abstract

Demographic analyses of age-structured populations typically rely on life history data for individuals, or when individual animals are not identified, on information about the numbers of individuals in each age class through time. While it is usually difficult to determine the age class of a randomly encountered individual, it is often the case that the individual can be readily and reliably assigned to one of a set of age classes. For example, it is often possible to distinguish first-year from older birds. In such cases, the population age structure can be regarded as a latent variable governed by a process prior, and the data as summaries of this latent structure. In this article, we consider the problem of uncovering the latent structure and estimating process parameters from summaries of age class information. We present a demographic analysis for the critically endangered migratory population of whooping cranes (Grus americana), based only on counts of first-year birds and of older birds. We estimate age and year-specific survival rates. We address the controversial issue of whether management action on the breeding grounds has influenced recruitment, relating recruitment rates to the number of seventh-year and older birds, and examining the pattern of variation through time in this rate.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Demographic analysis from summaries of an age-structured population
Series title:
Biometrics
Volume
59
Issue:
4
Year Published:
2003
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
778
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Biometrics
First page:
778