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Crab punting or poling can be somewhat like sculling.... Martinez, M. M., Full, R. J., and Koehl, M. A. R. 1998. Underwater punting by an intertidal crab: A novel gait revealed by the kinematics of pedestrian locomotion in air versus water. J. exp. Bio. 201, Abstract: As an animal moves from air to water, its effective weight is substantially reduced by buoyancy while the fluid-dynamic forces (e.g., lift and drag) are increased 800-fold. The changes in the magnitude of these forces are likely to have substantial consequences for locomotion as well as for resistance to being overturned. We began our investigation of aquatic pedestrian locomotion by quantifying the kinematics of crabs at slow speeds where buoyant forces are more important relative to fluid-dynamic forces. At these slow speeds, we used reduced-gravity models of terrestrial locomotion to predict trends in the kinematics of aquatic pedestrian locomotion. Using these models, we expected animals in water to use running gaits even at slow speeds. We hypothesized that aquatic pedestrians would (1) use lower duty factors and longer periods with no ground contact, (2) demonstrate more variable kinematics and (3) adopt wider stances for increased horizontal stability against fluid-dynamic forces than animals moving at the same speed on land. We tested these predictions by measuring the three-dimensional kinematics of intertidal rock crabs (Grapsus tenuicrustatus) locomoting through water and air at the same velocity (9 cm s-1) over a flat substratum. As predicted from reduced-gravity models of running, crabs moving under water showed decreased leg contact times and duty factors relative to locomotion on land. In water, the legs cycled intermittently, fewer legs were in contact with the substratum and leg kinematics were much more variable than on land. The width of the crab's stance was 19% greater in water than in air, thereby increasing stability against overturning by hydrodynamic forces. Rather than an alternating tetrapod or metachronal wave gait, crabs in water used a novel gait we termed "underwater punting', characterized by alternating phases of generating thrust against the substratum and gliding through the water. ____________________________ John F. Bratton, Ph.D. Coastal and Marine Geology Program U.S. Geological Survey 384 Woods Hole Rd. Woods Hole, MA 02543 Phone: 508-457-2254 Fax: 508-457-2310 email: jbratton@usgs.gov http://woodshole.er.usgs.gov/ ____________________________ Patricio Dominguez To: paleonet@nhm.ac.uk <patd@nhm.ac.uk> cc: Sent by: Subject: paleonet swimming by sculling in animals paleonet-owner@nh m.ac.uk 02/04/03 01:49 PM Please respond to paleonet Some boats, as the japanese ro or the chinese yuloh, use a single oar as a driving device. It is not frequent that bilateral animals use asimetric devices to swim by sculling. I am looking for examples of sculling in animals. Any idea besides mola fish? Cheers, Patricio Dominguez ### NEW PHONE NUMBER ### __ Dr. Patricio DOMINGUEZ-ALONSO Department of Palaeontology The Natural History Museum Cromwell Road, London SW7 5BD, UK patd@nhm.ac.uk patricio@geo.ucm.es padomin@terra.es Tel 0207 942 5335 (internationally 0044 207 942 5335) Fax 0207 942 5546 (internationally 0044 207 942 5546)
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