Two distinct developmentally related behaviour patterns can be identified in third-instar larvae of Drosophila melanogaster, 'foraging' behaviour and 'wandering', a pre-pupation behaviour. An age-related change in behaviour from foraging to wandering is quantified by measuring larval locomotion at the early, middle and late third instar in an environment where food is distributed in patches. Strain, moisture, food and inhomogeneities in the texture of the surface of the medium significantly influence larval locomotory behaviour. © 1984.
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