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First published online June 15, 2006
Journal of Experimental Biology 209, 2480-2485 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02211
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The relationship between body size and evoked potentials from the statocysts of the prawn Palaemon serratus

J. M. Lovell1,*, R. M. Moate2, L. Christiansen2 and M. M. Findlay1

1 School of Earth, Ocean and Environmental Sciences and University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
2 Plymouth Electron Microscopy Centre, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK


Figure 1
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  		Fig. 1. (A) Diagrammatic representation of a prawn showing all body segments and location of statocyst (circled area). (B) Higher magnification of first antennule illustrating its segments and statocyst positioning. (C) The statocyst, showing the position of the sensory setae and statolith.

 

Figure 2
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  		Fig. 2. (A) Scanning electron micrograph of the statocyst from a 43 mm P. serratus showing the solitary sensory seta (sss) positioned away from the organised row, a feature present on each specimen examined. A small amount of otolithic material (om) can be seen on the dorsal surface of the statocyst. hc, hair cell; oc, outer crescent; sc, sensory cushion. (B) Close-up of a typical row of sensory setae present on all statocyst samples, viewed from above with the binding mucous removed. hcb, hair cell base; us, upper tapering section of hair cell; tlp, thread-like projections.

 

Figure 3
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  		Fig. 3. Box and whisker plot displaying the relationship between setae length and body size in P. serratus. The grey boxes represent the lower and the upper quartile of the data, and the black line in the boxes specifies the median. The vertical bars represent the lower and upper extremes of the recorded setae lengths.

 

Figure 4
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  		Fig. 4. Auditory evoked potentials from the 27–35 mm, the 50–55 mm and 66–71 mm body length P. serratus in response to a 500 Hz tone burst presented at 125 dB, and averaged from 1000 iterations of the stimulus sound. The arrows indicate the peak of the largest sinusoid of the response from the three sizes of prawn tested 27–40 mm, 41–59 mm and 63–71 mm.

 




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