Entheseal changes in free-ranging versus zoo reindeer: Observing activity status of reindeer

S. Niinimäki, A-K. Salmi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We evaluate whether entheseal changes (EC) can be used to reconstruct activity among reindeer to study its domestication. Humans influence reindeer activity patterns through corralling, which renders them less mobile than free-ranging reindeer and through use as draught animals, which can result in overuse of certain muscles. There is also variation within free-ranging reindeer in baseline activity levels due to environmental factors. Other sources of variation at entheses include age, sex, pathology, size, and genetic disposition. Here we examine if there are differences in the entheses between zoo versus free-ranging reindeer. We recorded the entheses of reindeer long bones using a modified EC scoring system. Weight effects were accounted for by performing analyses separately for specimens under and over 95 kg, but unfortunately age information was lacking. We found that several flexor muscle insertion sites in the ulna were more developed among free-ranging reindeer. This difference is likely due to feeding behaviour. The free-ranging animals were digging for lichen from under the snow whereas the zoo reindeer were fed by their keepers. This difference in entheses, however, was found to be significant only among the heavier reindeer. Among the zoo reindeer, the insertion for Subscapularis muscle was more developed, possibly due to increased time spent immobile with the shoulder-bracing muscle apparatus activated. This difference was significant among the heavier deer and nearly statistically significant among the lighter weight reindeer. Domesticated Siberian draught reindeer fell between zoo and free-ranging reindeer in several tibial entheses. According to these results, some forelimb entheses may be useful to study differences in mobility and feeding patterns between groups of reindeer. Copyright © 2014 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)314-323
Number of pages10
JournalInternational journal of osteoarchaeology
Volume26
Issue number2
Early online date1 Nov 2014
DOIs
Publication statusPublished - Mar 2016

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animal
system change
pathology
disposition
environmental factors
Zoo
Reindeer
Group
time

Keywords

  • entheseal changes
  • reindeer domestication
  • activity reconstruction
  • musculoskeletal stress markers
  • human-animal relationships
  • reindeer feeding behaviour

Cite this

Entheseal changes in free-ranging versus zoo reindeer : Observing activity status of reindeer. / Niinimäki, S.; Salmi, A-K.

In: International journal of osteoarchaeology, Vol. 26, No. 2, 03.2016, p. 314-323.

Research output: Contribution to journalArticle

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abstract = "We evaluate whether entheseal changes (EC) can be used to reconstruct activity among reindeer to study its domestication. Humans influence reindeer activity patterns through corralling, which renders them less mobile than free-ranging reindeer and through use as draught animals, which can result in overuse of certain muscles. There is also variation within free-ranging reindeer in baseline activity levels due to environmental factors. Other sources of variation at entheses include age, sex, pathology, size, and genetic disposition. Here we examine if there are differences in the entheses between zoo versus free-ranging reindeer. We recorded the entheses of reindeer long bones using a modified EC scoring system. Weight effects were accounted for by performing analyses separately for specimens under and over 95 kg, but unfortunately age information was lacking. We found that several flexor muscle insertion sites in the ulna were more developed among free-ranging reindeer. This difference is likely due to feeding behaviour. The free-ranging animals were digging for lichen from under the snow whereas the zoo reindeer were fed by their keepers. This difference in entheses, however, was found to be significant only among the heavier reindeer. Among the zoo reindeer, the insertion for Subscapularis muscle was more developed, possibly due to increased time spent immobile with the shoulder-bracing muscle apparatus activated. This difference was significant among the heavier deer and nearly statistically significant among the lighter weight reindeer. Domesticated Siberian draught reindeer fell between zoo and free-ranging reindeer in several tibial entheses. According to these results, some forelimb entheses may be useful to study differences in mobility and feeding patterns between groups of reindeer. Copyright {\circledC} 2014 John Wiley & Sons, Ltd.",
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note = "We wish to thank the three anonymous referees for their comments on the earlier version of this manuscript. We are grateful to the Zoological Museum at the University of Oulu for the access to the skeletal collections, and to the Arctic Domus project (David Anderson, Dmitry Arzyutov, Artur Kharinskii, and Yevgeni Ineshin) for the access to the scanned skeletons of the Siberian draught reindeer. Thanks are also offered to Fyodor Malkov who assisted with the 3D scanning of the specimens, and Robert Losey for comments on the earlier version of this paper. We also wish to thank Tiina Kuvaja for her assistance with photographs in Appendix S1, and Hanna Puolakka for technical advice in analysis of the 3D scans. This research was financially supported by the Arctic Domus project, Alfred Kordelin Foundation through the Finnish Post-doc Pool, and the Academy of Finland(project no. 138081).",
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