Mechanical Memory Hypothesized in the Homing Abalone Haliotis diversicolor supertexta under Experimental Conditions

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  • Mechanical Memory Hypothesized in the Homing Abalone <i>Haliotis diversicolor supertexta</i> under Experimental Conditions
  • Mechanical Memory Hypothesized in the H

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To investigate the physiological mechanism of homing, the abalone Haliotis diversicolor supertexta was individually accommodated in a 2m basin. Abalone, and a disc on which a shelter was fixed, were set centrally, and a luminous rod on the animal's shell was monitored to trace the locomotion path in dark conditions at night-time. The effects of shelter removal with the disc and angular displacement of a substrative sheet were examined.<br> The locomotion path seemed to consist of three fundamental components: peripheral, central and petaled rounds. The homing path was almost straight and not the route previously drawn. Near or after the real time of sunrise, most abalone homed or passed the shelter and settled peripherally. Without the shelter, the homing abalone wandered in the central bottom area. The abalone compensated or biased its locomotive direction against horizontal rotations of the substratum. The homing may be realized by a mechanical memory of locomotive directions during dead-reckoning.

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