Abstract
Oxyrrhis marina is a heterotrophic dinoflagellate that swims in helical paths in athree-dimensional (3D) environment. It is also known to react to various environ-mental stimuli and resultant changes in its swimming patterns have been widelyobserved. Understanding this swimming behaviour and providing tools for quanti-fying swimming-related parameters will aid in interpreting its response to environ-mental stimuli, including the presence of food items and chemical cues. We reviewthe literature on the analysis of swimming in O. marina. We also outline the relatedfields of random walks, path analysis and simulation of individual-based movementwhere relevant to O. marina. We then discuss some of the problems associated withtrying to understand 3D helical movement through analysis of two-dimensional(2D) video microscopy data. We emphasize that the current models in the litera-ture cannot accurately simulate helical walks and conclude that O. marina would bea suitable candidate for establishing a standard 3D framework that can be used asa tool to characterize observed movement patterns in the future.KEYWORDS: Oxyrrhis marina; protist; swimming behaviour; path analysis; helicalrandom walks
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