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Journal of Mammalian Evolution

, Volume 22, Issue 3, pp 435–450 | Cite as

Adjustments of Limb Mechanics in Cotton-top Tamarins to Moderate and Steep Support Orientations: Significance for the Understanding of Early Primate Evolution

  • Bettina Hesse
  • John A. Nyakatura
  • Martin S. Fischer
  • Manuela Schmidt
Original Paper

Abstract

Early primate evolution is connected to the efficient exploitation of the terminal branch habitat. Mammals that forage in this habitat constantly encounter flexible thin branches that bend under the weight of the animals and thus form steeply inclined and declined supports. This study was aimed to gain insight into how cotton-top tamarins – a previously proposed modern analogue for a hypothetical stage in early primate evolution with prehensile autopodia – meet the specific functional demands when navigating thin, branch-like supports of different orientation. X-ray motion analysis was combined with synchronous single limb substrate reaction force measurements to discern limb mechanical adjustments. Previously reported gait parameter adjustments were confirmed for moderate support orientations, but on the steepest inclines and declines kinematic discontinuities were observed. These are interpreted to emphasize the functional roles of the forelimbs (net-braking role) and hind limbs (net-propulsive role) already established for level and moderately inclined supports. Tensile forces were exerted by the forelimbs on the steepest inclines and by the hind limbs on the steepest declines (head-first descents). Even though non-specialized small mammals have also been shown to successfully negotiate similar supports, prehensility offers advantages for foraging on thin, steeply inclined and declined terminal branches. Thus, the evolution of prehensile autopodia in small early primates likely has enhanced the exploitation of the terminal branch habitat.

Keywords

X-ray motion analysis Force measurement Saguinus oedipus Primate Locomotion 

Notes

Acknowledgments

The experimental setup was developed by André Schmidt, Jörg Mämpel, and Sebastian Köring and was used in previous studies. We thank Rommy Petersohn for technical assistance and Sandra Clemens, Marlen Hinz, Johanna Neufuß, and Gabriele Unterhitzenberger for help with animal keeping. We also thank the reviewers and John Wible for their help to improve the manuscript. This study was funded by the Federal Ministry of Education and Research (BMBF, Fkz 01RI0633).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Bettina Hesse
    • 1
  • John A. Nyakatura
    • 1
    • 2
  • Martin S. Fischer
    • 1
  • Manuela Schmidt
    • 1
  1. 1.Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem MuseumFriedrich-Schiller-Universität JenaJenaGermany
  2. 2.AG Morphologie und Formengeschichte. Bild Wissen Gestaltung - ein Interdisziplinäres Labor & Institut für BiologieHumboldt Universität zu BerlinBerlinGermany

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