In social mammals, territory size and shape vary according to the number and strength of neighbour individuals competing for resources. Two main theories have been proposed to explain this variability: the Group Augmentation (GA) and the realized Resource Holding Potential (rRHP) hypotheses. The first states that the outcome of the interactions among groups depends on the total number of individuals in the group while the second states that only the number of animals directly involved in intergroup competition determines this outcome. We collected data on space use of individually tagged Alpine marmots (Marmota marmota), a cooperative breeding species that overlaps part of its territory with neighbouring groups. In accordance with the rRHP hypothesis, we found that groups having higher proportion of helpers, rather than higher total number of individuals, had lower percentage of the territory overlapping with neighbouring groups and a larger area available for individual exclusive use.
BartonK. (2009). MuMIn: multi-model inference R package version 0.12.2/r18. — R Foundation for Statistical Computing Vienna.
BassanoB.PeracinoV.MontacchiniF. (1996). Food habits of Alpine marmot (Marmota marmota). — In: Proceedings of the second international conference on marmots: Biodiversité chez les marmottes/Biodiversity in marmots International Marmot Network Aussois France p. 135-140.
Scent deposition by cheek rubbing in the Alpine marmot (Marmota marmota) in the French alps. —
Can. J. Zool.73:
Does watching a monkey change its behaviour? Quantifying observer effects in habituated wild primates using automated radiotelemetry. —
Are kernels the mustard? Data from global positioning system (GPS) collars suggests problems for kernel home-range analyses with least-squares cross-validation. —
J. Anim. Ecol.74:
Analysis of animal space use and movements. — In:
Radio tracking and animal populations (
MillspaughJ.MarzluffJ.M. eds). Academic PressSan Diego, CA p.
KoolhaasJ.M.KorteS.M.De BoerS.F.Van Der VegtB.J.Van ReenenC.G.HopsterH.De JongI.C.RuisM.A.BlokhuisH.J. (1999).
Coping styles in animal: current status in behavior and stress-physiology. —
Neurosci. Biobehav. Rev.23: