Behavioral Ecology and Sociobiology

, Volume 65, Issue 2, pp 287–295

Mating group composition influences somatic costs and activity in rutting dominant male reindeer (Rangifer tarandus)

  • Erica M. Tennenhouse
  • Robert B. Weladji
  • Øystein Holand
  • Knut H. Røed
  • Mauri Nieminen
Original Paper

DOI: 10.1007/s00265-010-1043-8

Cite this article as:
Tennenhouse, E.M., Weladji, R.B., Holand, Ø. et al. Behav Ecol Sociobiol (2011) 65: 287. doi:10.1007/s00265-010-1043-8

Abstract

In polygynous species, males devote considerable effort to reproduction during the rut. Both the number of females in the mating group and the ratio of sexually mature males to sexually mature females [adult sex ratio (ASR)] are expected to affect the amount of effort a male devotes to reproductive activities. We predicted the reproductive effort of dominant male reindeer, measured as relative mass loss, proportions of active reproductive behaviors, and frequencies of agonistic behaviors would (1) increase with an increasing number of females in the mating group and eventually level off, and (2) exhibit a dome shape with respect to ASR in the mating group. We tested these predictions using 12 years of data collected from semi-domesticated reindeer in northern Finland. We found a positive relationship between relative mass loss and the mean number of females in the mating group for mature, but not young males. The relationship between the proportion of active reproductive behaviors performed by mature males and the mean number of females in the group was quadratic while agonistic behaviors of mature males increased with the increasing female group size. We also found that active reproductive behaviors decreased with a rising mating group ASR for mature males; whereas, young males performed more agonistic behaviors as group ASR increased. Our results point to age-specific patterns of mass loss and activity during the mating season. They also indicate that both the number of females and ASR in the mating group are important factors in determining the level of reproductive effort of dominant male reindeer.

Keywords

Adult sex ratioAgonistic behaviorsMale reproductive effortMass lossOperational sex ratioRangifer tarandusRut

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Erica M. Tennenhouse
    • 1
  • Robert B. Weladji
    • 1
  • Øystein Holand
    • 2
  • Knut H. Røed
    • 3
  • Mauri Nieminen
    • 4
  1. 1.Department of BiologyConcordia UniversityMontrealCanada
  2. 2.Department of Animal and Aquacultural SciencesNorwegian University of Life SciencesÅsNorway
  3. 3.Department of Basic Sciences and Aquatic MedicineNorwegian School of Veterinary ScienceOsloNorway
  4. 4.Finnish Game and Fisheries Research Institute, Reindeer Research StationKaamanenFinland