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

Content Provider	Springer Nature Link
Author	Tennenhouse, Erica M. Weladji, Robert B. Holand, Øystein Røed, Knut H. Nieminen, Mauri
Copyright Year	2010
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.
Starting Page	287
Ending Page	295
Page Count	9
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	65
Issue Number	2
e-ISSN	14320762
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-08-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adult sex ratio Agonistic behaviors Male reproductive effort Mass loss Operational sex ratio Rangifer tarandus Rut Behavioural Sciences Evolutionary Biology Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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Effects of age, density and sex ratio on reproductive effort in male reindeer (Rangifer tarandus) (2003)

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