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You are here:   animal list > Ocypode cordimanus

 

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Ocypode cordimanus Desmarest, 1825

Smooth-handed ghost crab

Sharon Edgley (2011)


 

 

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Cyclicity

Circadian clocks have evolved in all forms of life (Rosbash 2009).  In several species of crustaceans, rhythmicity is apparent in behaviour, development, physiological and sensory processes (Palmer 1971; Strauss and Dircksen 2010).  Although a master clock has not been identified in crustaceans, clock, period and cryptochrome-gene products are present in the central nervous system and other organs (Strauss and Dircksen 2010).

 

To test whether locomotor activity in O. cordimanus is governed by day/night cycles, an experiment was performed in which 14 individuals were put into a tank and subjected to normal day/night cycles (Tank A) while 14 individual in another tank (Tank B) were subjected to reversed light cycles (12 hours out of phase) over a 24 hour period.  Results showed that animals subjected to an out of phase day/night cycle were not significantly more, nor less, active than animals subjected to normal day/night cycles (Fig 2. unpublished data).   This finding correlates with previous studies that demonstrated the the the tendency for O. cordimanus to maintain autonomous locomotor rhythms (Palmer 1971).

 

 



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