| Coordination of multiple appendages in drag-based swimming. | |
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MedLine Citation:
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PMID: 20413558 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Krill are aquatic crustaceans that engage in long distance migrations, either vertically in the water column or horizontally for 10 km (over 200,000 body lengths) per day. Hence efficient locomotory performance is crucial for their survival. We study the swimming kinematics of krill using a combination of experiment and analysis. We quantify the propulsor kinematics for tethered and freely swimming krill in experiments, and find kinematics that are very nearly metachronal. We then formulate a drag coefficient model which compares metachronal, synchronous and intermediate motions for a freely swimming body with two legs. With fixed leg velocity amplitude, metachronal kinematics give the highest average body speed for both linear and quadratic drag laws. The same result holds for five legs with the quadratic drag law. When metachronal kinematics is perturbed towards synchronous kinematics, an analysis shows that the velocity increase on the power stroke is outweighed by the velocity decrease on the recovery stroke. With fixed time-averaged work done by the legs, metachronal kinematics again gives the highest average body speed, although the advantage over synchronous kinematics is reduced. |
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Authors:
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Silas Alben; Kevin Spears; Stephen Garth; David Murphy; Jeannette Yen |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-04-22 |
Journal Detail:
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Title: Journal of the Royal Society, Interface / the Royal Society Volume: 7 ISSN: 1742-5662 ISO Abbreviation: J R Soc Interface Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-09-29 Completed Date: 2011-02-11 Revised Date: 2011-11-07 |
Medline Journal Info:
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Nlm Unique ID: 101217269 Medline TA: J R Soc Interface Country: England |
Other Details:
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Languages: eng Pagination: 1545-57 Citation Subset: IM |
Affiliation:
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School of Mathematics, Georgia Institute of Technology, Atlanta, GA 30332-0160, USA. alben@math.gatech.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biomechanics Euphausiacea / anatomy & histology, physiology* Extremities / physiology* Models, Biological Swimming / physiology* |
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