Please use this identifier to cite or link to this item:
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Cohort variation in body mass dissipates with age in large herbivores (Forthcoming)
Authors: Hamel, Sandra
Gaillard, Jean-Michel
Yoccoz, Nigel
Albon, Steve
Cote, Steeve D
Craine, Joseph M
Festa-Bianchet, Marco
Garel, Mathieu
Lee, Phyllis C
Moss, Cynthia J
Nussey, Daniel H
Pelletier, Fanie
Stien, Audun
Tveraa, Torkild
Contact Email:
Keywords: Compensatory growth
catch-up growth
cumulative effects
cohort, life-history tactics
mixture models
sexual selection
“slow-fast” continuum
viability selection
Issue Date: 2016
Publisher: Wiley-Blackwell for Ecological Society of America
Citation: Hamel S, Gaillard J, Yoccoz N, Albon S, Cote SD, Craine JM, Festa-Bianchet M, Garel M, Lee PC, Moss CJ, Nussey DH, Pelletier F, Stien A & Tveraa T Cohort variation in body mass dissipates with age in large herbivores (Forthcoming), Ecological Monographs.
Abstract: Environmental conditions experienced during early growth and development markedly shape phenotypic traits. Consequently, individuals of the same cohort may show similar life-history tactics throughout life. Conditions experienced later in life, however, could fine-tune these initial differences, either increasing (cumulative effect) or decreasing (compensatory effect) the magnitude of cohort variation with increasing age. Our novel comparative analysis that quantifies cohort variation in individual body size trajectories shows that initial cohort variation dissipates throughout life, and that lifetime patterns change both across species with different paces of life and between sexes. We used longitudinal data on body size (mostly assessed using mass) from 11 populations of large herbivores spread along the “slow-fast” continuum of life histories. We first quantified cohort variation using mixture models to identify clusters of cohorts with similar initial size. We identified clear cohort clusters in all species except the one with the slowest pace of life, revealing that variation in early size is structured among cohorts and highlighting typological differences among cohorts. Growth trajectories differed among cohort clusters, highlighting how early size is a fundamental determinant of lifetime growth patterns. In all species, among-cohort variation in size peaked at the start of life, then quickly decreased with age and stabilized around mid-life. Cohort variation was lower in species with a slower than a faster pace of life, and vanished at prime age in species with the slowest pace of life. After accounting for viability selection, compensatory/catch-up growth in early life explained much of the decrease in cohort variation. Females showed less phenotypic variability and stronger compensatory/catch-up growth than males early in life, whereas males showed more progressive changes throughout life. These results confirm that stronger selective pressures for rapid growth make males more vulnerable to poor environmental conditions early in life and less able to recover after a poor start. Our comparative analysis illustrates how variability in growth changes over time in closely related species that span a wide range on the “slow-fast” continuum, the main axis of variation in life-history strategies of vertebrates.
Type: Journal Article
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of Tromso
Claude Bernard University Lyon 1
University of Tromso
The James Hutton Institute
Universite Laval, Canada
Kansas State University
Université de Sherbrooke
Office National de la Chasse et de la Faune Sauvage, France
Amboseli Trust for Elephants
University of Edinburgh
Université de Sherbrooke
Norwegian Institute for Nature Research
Norwegian Institute for Nature Research

Files in This Item:
File Description SizeFormat 
cohort_all.pdf2.76 MBAdobe PDFUnder Embargo until 12/7/2017     Request a copy

Note: If any of the files in this item are currently embargoed, you can request a copy directly from the author by clicking the padlock icon above. However, this facility is dependant on the depositor still being contactable at their original email address.

This item is protected by original copyright

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

If you believe that any material held in STORRE infringes copyright, please contact providing details and we will remove the Work from public display in STORRE and investigate your claim.