Document Detail


The cost of incline locomotion in ghost crabs (Ocypode quadrata) of different sizes.
MedLine Citation:
PMID:  21567169     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
It is well established that the metabolic cost of horizontal locomotion decreases as a regular function of animal body mass, regardless of body form and phylogeny. How body size affects the cost of incline exercise remains much less clear. Studies on vertebrates have led to the hypotheses that the cost of vertical work is independent of body mass and that the added cost of locomoting on inclines is lower for small animals. Studies on vertebrates and a few invertebrates provide evidence both for and against these hypotheses. To gain further insight into the cost of incline exercise, we measured oxygen consumption of small (2.33 ± 0.07 g) and large (46.66 ± 5.33 g) ghost crabs (Ocypode quadrata) locomoting horizontally and up a 20° incline. The slope of the oxygen consumption versus speed relationship (= minimum cost of transport) was not significantly different for small crabs exercising horizontally and on an incline. However, the intercept for incline exercise was significantly higher, indicating that small crabs used more energy during incline exercise than during horizontal exercise. Incline had no effect on the slope or intercept of the oxygen consumption versus speed relationship for large crabs. Our results suggest that the cost of incline locomotion may be large for small animals and that the cost is not independent of body size. Our results add to the growing body of research indicating that body mass is but one factor that determines the cost of incline locomotion and efficiency of vertical work.
Authors:
Alexa Tullis; Scott C Andrus
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-5-13
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  -     ISSN:  1432-136X     ISO Abbreviation:  -     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-5-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
The University of Puget Sound, 1500 N. Warner St, Tacoma, 98416, WA, USA, atullis@pugetsound.edu.
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