Abstract
The limb beat movements of Balanus (= Semibalanus) balanoides (L.) and Elminius modestus Darwin nauplii were used to study the response of the larvae to patches of microalgae. Observations were made on restrained larvae in relatively large volumes of flowing sea water. The behaviour of the larvae was recorded on video-tape and analysed, frame-by-frame, after the experiment. It was found that the volume through which the antennae moved (= swept volume; a combination of antennal surface area, beat frequency, amplitude and percentage of time spent swimming) in a minute was increased, for both species, in the presence of microalgae. The response was evoked by Skeletonema costatum (Grev.) Cleve and Tetraselmis suecica (Kylin) Butcher at temperatures of 10–20°C. The swept volume rose with increasing algal concentration to a plateau, at concentrations above 100 cells·μl−1,≈50% higher than the values obtained without algae.
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