A FIELD TECHNIQUE FOR RECORDING THE ACTIVITY OF LIMPETS

A field technique for recording both temporal and spatial parameters of activity in limpets was tested on a Tyrrhenian population of Patella rustica Linnaeus which shows definite homing behaviour. Timing of foraging excursions was recorded using reed switches activated by a magnet glued to the shell apex. The 'lsquo;at home-away' status of each animal was continuously screened throughout one month by interfacing the sensors with a computer. Moreover, individual excursions were minutely reconstructed by using a moto-graphic technique which combined LED-tracking (nocturnal activity) and instantaneous photography (daytime movements). An original wave-meter was designed to monitor the sea-status during the study period. The quality of the temporal and spatial data obtained with this technique is evaluated, and further improvements of the technique are discussed. © 1990 The Malacological Society of London.