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Displacement of marine animals is affected bydiverse environmental factors, including hydrodynamicsperformance. We evaluated the effect of current velocity onthe displacement of the sea urchin Strongylocentrotusfranciscanus in an experimental flume, in both light and darkconditions. We observed that movement of S. franciscanus wasdirectly proportional to the current speed. Our results differfrom previous studies in the amount and the direction ofdisplacement of other strongylocentrotids, because sea urchinsdisplacements were similar in the current direction and countercurrentirrespective of current velocity and our results showeddisplacements of circa 7 m per day, smaller to that reported forexperiments in the same urchin species in British Columbia.The differences may be due to the absence of predators or food,or the trials in day and night conditions. Day and nightdifferences in the displacement of S. franciscanus were notobserved.

revista de biología marina y oceanografía

Experimental displacement trials of the red sea urchin Strongylocentrotus franciscanus (Aggassiz, 1863) (Echinodermata: Echinoidea) at different current velocities