Document Detail


The kinematic consequences of locomotion on sloped arboreal substrates in a generalized (Rattus norvegicus) and a specialized (Sciurus vulgaris) rodent.
MedLine Citation:
PMID:  21753049     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Small mammals must negotiate terrains that consist of numerous substrates that vary in diameter, surface structure, rigidity and orientation. Most studies on mammals have focused on the effects of substrate diameter during horizontal locomotion, especially in small- to medium-sized primates and marsupials. Locomotion across sloped arboreal substrates, however, is poorly understood. Here, in order to determine which locomotor parameters a terrestrial mammal, the rat, and a tree-dwelling mammal, the European red squirrel, modify in response to differences in substrate orientation, three-dimensional kinematics were examined using biplanar videoradiography as the animals moved on 30 and 60 deg inclined branches. Our results revealed that to maintain stability and friction as well as balance during inclined branch locomotion, these species utilize comparable locomotor adjustments despite significant differences in travel speed and gait. Rats and European red squirrels increased limb flexion and retraction in order to bring the center of mass as close as possible to the substrate surface and to achieve maximum propulsion. Additionally, forelimbs were placed more laterally and underneath the branch whereas the hindlimbs were placed approximately on the top of the branch. These locomotor adjustments, which have also been observed in primates and marsupials, are independent of speed, morphological adaptations and limb proportions and thus might be strategies used by early mammals. Our results also suggest that mammals that lack, or have reduced, grasping abilities try to maintain the locomotor mode used during horizontal branch locomotion on inclined branches for as long as possible.
Authors:
André Schmidtg; Martin S Fischer
Related Documents :
10772259 - Methods for correlating t1rho and fid components in wideline 1h nmr studies of motional...
19475049 - Variable-focus lens with 1-khz bandwidth.
3256429 - A non-linear elastic model of contraction of ischaemic segments.
11003269 - False cerebral activation on bold functional mr images: study of low-amplitude motion w...
17734169 - Late cenozoic uplift of denali and its relation to relative plate motion and fault morp...
7001879 - Semiautomated method for evaluation of left ventricular regional wall motion in coronar...
17552479 - Loudspeaker equalization for auditory research.
19146359 - Optic flow in human vision: meg reveals a foveo-fugal bias in v1, specialization for sp...
19063299 - Technical challenges in the acoustic detection of manatee vocalizations.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  214     ISSN:  1477-9145     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-07-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2544-59     Citation Subset:  IM    
Affiliation:
Ohio University, College of Osteopathic Medicine, Department of Biomedical Sciences, 120 Life Sciences Building, Athens, OH 45701, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Not all songbirds calibrate their magnetic compass from twilight cues: a telemetry study.
Next Document:  Neuroepithelial cells and the hypoxia emersion response in the amphibious fish Kryptolebias marmorat...