, Volume 172, Issue 1, pp 129–140

Variability in temporary emigration rates of individually marked female Weddell seals prior to first reproduction


    • Department of EcologyMontana State University
  • Jay J. Rotella
    • Department of EcologyMontana State University
  • Robert A. Garrott
    • Department of EcologyMontana State University
Population ecology - Original research

DOI: 10.1007/s00442-012-2472-z

Cite this article as:
Stauffer, G.E., Rotella, J.J. & Garrott, R.A. Oecologia (2013) 172: 129. doi:10.1007/s00442-012-2472-z


In many species, temporary emigration (TE) is a phenomenon, often indicative of life-history characteristics such as dormancy, skipped reproduction, or partial migration, whereby certain individuals in a population are temporarily unobservable at a particular site. TE may be a flexible condition-dependent strategy that allows individuals to mitigate effects of adverse conditions. Consequently, TE rates ought to be highly variable, but sources of variations are poorly understood for most species. We used data from known-aged female Weddell seals (Leptonychotes weddellii) tagged in Erebus Bay, Antarctica, to investigate sources of variation in TE rates prior to reproduction and to evaluate possible implications for age-specific probability of first reproduction. TE rates were near 1 the year after birth, decreased to an average of 0.15 (\( \widehat{\text{SE}} \) = 0.01) by age 8, and were similar thereafter. TE rates varied substantially from year-to-year and were lower for seals that attended reproductive colonies the previous year than for seals that did not attend (e.g., \( \overline{{\hat{\psi }_{{i,{\text{age}}\,8}}^{\text{UU}} - \hat{\psi }_{{i,\,{\text{age}}\,8}}^{\text{PU}} }} \) = 0.22). Recruitment rates were marginally greater for seals that did attend than for seals that did not attend colonies the previous year. For Weddell seals specifically, our results suggest that (1) motivation to attend colonies varied temporally, (2) as seals grew older they had increased motivation to attend even before reproductive maturity, and (3) seals appear to follow various attendance strategies. More broadly, our results support the idea of TE as a variable, condition-dependent strategy, and highlight the utility of TE models for providing population and life-history insights for diverse taxa.


Capture–mark–recaptureColonial breedingCondition-dependentLeptonychotes weddelliiOpen robust designRecruitmentSocial learningTrade-offsUnobservable states

Supplementary material

442_2012_2472_MOESM1_ESM.pdf (869 kb)
Supplementary material 1 (PDF 868 kb)

Copyright information

© Springer-Verlag 2012