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However, the sensory biology of alveolate grazers is poorly understood. Using novel techniques that combine electrophysiological measurements and high-speed videomicroscopy we investigated the sensory biology of Favella sp., a model alveolate grazer, in the context of its trophic ecology. Favella sp. produced frequent rhythmic depolarizations (\u223c500 ms long) that caused backward swimming and are responsible for endogenous swimming patterns relevant to foraging. Contact of both prey cells and non-prey polystyrene microspheres at the cilia produced immediate mechano-stimulated depolarizations (\u223c500 ms long) that caused backward swimming, and likely underlie aggregative swimming patterns of Favella sp. in response to patches of prey. Contact of particles at the peristomal cavity that were not suitable for ingestion resulted in MSDs after a lag of \u223c600 ms, allowing time for particles to be processed before rejection. Ingestion of preferred prey particles was accompanied by transient hyperpolarizations (\u223c1 s) that likely regulate this step of the feeding process. Predation attempts by the copepod Acartia tonsa elicited fast (\u223c20 ms) animal-like action potentials accompanied by rapid contraction of the cell to avoid predation. We have shown that the sensory mechanisms of Favella sp. are finely tuned to the type, location, and intensity of stimuli from prey and predators.<\/jats:p>","DOI":"10.1242\/jeb.121871","type":"journal-article","created":{"date-parts":[[2015,11,14]],"date-time":"2015-11-14T02:23:56Z","timestamp":1447467836000},"source":"Crossref","is-referenced-by-count":12,"title":["Feast or flee: bioelectrical regulation of feeding and predator evasion behaviors in the planktonic alveolate<i>Favella<\/i>sp. 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