LARVAL SETTLING BEHAVIOR IN CYANEA CAPILLATA (CNIDARIA : SCYPHOZOA)

The behavior of the planula of Cyanea capillata (Linneaus) is studied in the laboratory to determine if it responds to environmental cues in a way which may account for the distribution of its sedentary scyphistoma stage in the field.The planulae react to gravity, water chemistry, surface texture, and possibly to light. They exhibit an initial geopositive response in well-aerated sea water, but become active and geonegative under conditions associated with local depletion of oxygen. Their attachment follows, and is usually upside-down on a horizontal surface. They attach with greatest frequency on substrates that are rough, and give evidence of discriminating among surfaces of different rugosity. The planulae possibly show a weak photonegative response at the time of attachment; confirmation of this photic response requires further work. These sequential responses shown in the laboratory result in an orientation at the time of attachment which is in agreement with the position usually occupied by the scyp...

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