. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 196 M. J. WEISSBL'RG mosensory navigation shinilil consider the potential interac- tions between chemical cues and other stimuli. For animals that perceive current, perhaps navigation in response to the detection of individual, rapid odor transients is restricted to a ran-jc of narrow conditions comprising relatively swift unidirectional flows. Sadly, there is little information on perceptual limits in response to flow. Ebina and Wicsc (1984) suggest that crayfish align to current velocities as low as cm/s. but comparati
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 196 M. J. WEISSBL'RG mosensory navigation shinilil consider the potential interac- tions between chemical cues and other stimuli. For animals that perceive current, perhaps navigation in response to the detection of individual, rapid odor transients is restricted to a ran-jc of narrow conditions comprising relatively swift unidirectional flows. Sadly, there is little information on perceptual limits in response to flow. Ebina and Wicsc (1984) suggest that crayfish align to current velocities as low as cm/s. but comparative data are lacking. The consequences ot oscillatory flows, or complicated flow pat- terns that occur in the presence of underwater structural heterogeneity, are also unknown. Do animals m these situ- ations extract information from properties of odor pulses, or do they have other strategies? Lastly, studs ing animals with a fixed frame of reference may bias our perspecti\ e. In their three-dimensional world, tish or other midwater animals may not have access to other orienting stimuli unless the odor is predictably aligned to the vertical axis. Current direction would generally not be perceptible to the tish from its own Lagrangian perspective, except in certain unusual cases. Westerberg ( !9S4i presents an interesting hypothesis describing the use of shear gradients at strong density dis- continuities to detect flow direction. It is unknown whether such animals have a means of detecting (low. extract infor- mation from properties of odor pulses, or follow gradients. If the last alternative is true, then turbulent diffusion models capture the neccssarv signal properties. Ot course, gradient- following mechanisms set serious limits on orientation, since the integrated signal (which will be weaker than the peak intensities in a pulse) must be perceptible, and inten- sity differences must he detectable through space or time. real utility may be to suggest approaches of greater ri
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
