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First published online March 28, 2008
Journal of Experimental Biology 211, 1243-1248 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.014977
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To paddle or not: context dependent courtship display by male blue crabs, Callinectes sapidus

Michiya Kamio1,*, Matthew A. Reidenbach2,3 and Charles D. Derby1

1 Department of Biology, Brains & Behavior Program, and Center for Behavioral Neuroscience, Georgia State University, Atlanta, GA 30302, USA
2 Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA
3 Department of Integrative Biology, University of California, Berkeley, CA, USA


Figure 1
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  		Fig. 1. Stacked column of courtship-related behaviours shown by males in the presence of an accessible female and in the presence of an inaccessible female. Twelve male–female pairings were used, and each animal was used in both the accessible and inaccessible conditions. The number of animals showing courtship stationary paddling was significantly different between the accessible and inaccessible conditions (*P<0.01, Sign test). There was no significant difference in total courtship behaviour (Cradle carry + Courtship paddling) between the accessible and inaccessible conditions (NS, not significant P=0.48, Sign test).

 

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  		Fig. 2. Time course of behaviours produced by a male crab in the presence of an accessible female (above the time line) or in the presence of an inaccessible female (below the time line). N=the number of males that performed the given behaviour out of the number of males tested. The time line represents the average time (min) from the start of observation.

 

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  		Fig. 3. Particle imaging velocimetry images of currents generated by a male crab, with and without courtship stationary paddling. (A) Side view of the crab when it is not performing courtship stationary paddling. The gill current generates flow upwards toward the water surface. (B) Side view of the crab performing courtship stationary paddling, which generates a forward current. (C) View from above of the crab performing courtship stationary paddling, which generates a forward current. The mean velocity for current generated by the paddling was 3.1 cm s–1.

 

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© The Company of Biologists Ltd 2008