Complex patterns from simple decisions: the emergence of behaviours in Otiorhynchus sulcatus F.
1 Filming the movement of individual adult Otiorhynchus sulcatus in a stimulus-free arena allows the frequency distribution of turning angles to be obtained. Turns are predominantly anti-clockwise and the distribution is dominated by three preferred angles (approximately 50, 130 and 190°).
2 The implications of these results are explored through deterministic and stochastic random walk models of fixed step-length. Use of each of these turning angles results in different trajectories, potentially representing different search patterns.
3 The introduction of stochastic variation in the turning angles alters the trajectories and, for the 50° turning angle, results in an approximation to published descriptions of spiral and circular search patterns for other insects.
4 This single parameter random walk model is compared with previously published models and it is postulated that, for O. sulcatus, the selection of a turning angle is sufficient to provide a rich repertoire of spatial trajectories.
Document Type: Research Article
Affiliations: University of Plymouth, Seale-Hayne Campus, Newton Abbot, Devon TQ12 6NQ, U.K.
Publication date: November 1, 2004