Individual heterogeneity in growth and age at sexual maturity: A gamma process analysis of capture–mark–recapture data

Journal of Agricultural, Biological, and Environmental Statistics
By:  and 

Links

Abstract

Knowledge of organisms’ growth rates and ages at sexual maturity is important for conservation efforts and a wide variety of studies in ecology and evolutionary biology. However, these life history parameters may be difficult to obtain from natural populations: individuals encountered may be of unknown age, information on age at sexual maturity may be uncertain and interval-censored, and growth data may include both individual heterogeneity and measurement errors. We analyzed mark–recapture data for Red-backed Salamanders (Plethodon cinereus) to compare sex-specific growth rates and ages at sexual maturity. Aging of individuals was made possible by the use of a von Bertalanffy model of growth, complemented with models for interval-censored and imperfect observations at sexual maturation. Individual heterogeneity in growth was modeled through the use of Gamma processes. Our analysis indicates that female P. cinereus mature earlier and grow more quickly than males, growing to nearly identical asymptotic size distributions as males.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Individual heterogeneity in growth and age at sexual maturity: A gamma process analysis of capture–mark–recapture data
Series title Journal of Agricultural, Biological, and Environmental Statistics
DOI 10.1007/s13253-015-0211-8
Volume 20
Issue 3
Year Published 2015
Language English
Publisher American Statistical Association: International Biometric Society
Publisher location Alexandria, VA
Contributing office(s) Patuxent Wildlife Research Center
Description 10 p.
First page 343
Last page 352
Online Only (Y/N) N
Additional Online Files (Y/N) N