. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SENSORY BIOLOGY AND BEHAVIOR 313 of odor distribution) is required to navigate the distal patch held to a turbulent jet source. Supported by NSF Grant BES-9315791 to JA. Literature Cited 1. Moore, P., and J. Atema. 1991. Biol Hull .181: 408-418. 2. Dittmer, K., F. Grasso, and J. Atema. 1995. Biol. Dull 189: 232- 233. 3. Devine, D., and J. Alt-ma. 1982. Blot Bull 163: 144-153. 4. Moore, P., N. Scholz, and .J. Alcma. 1991. ./. Chan Ecol. 17(2): 1293-1307. 5. Basil, J., and J. Atema. 1994. Biol Bull 187:272-273. 6. Consi, T., F
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SENSORY BIOLOGY AND BEHAVIOR 313 of odor distribution) is required to navigate the distal patch held to a turbulent jet source. Supported by NSF Grant BES-9315791 to JA. Literature Cited 1. Moore, P., and J. Atema. 1991. Biol Hull .181: 408-418. 2. Dittmer, K., F. Grasso, and J. Atema. 1995. Biol. Dull 189: 232- 233. 3. Devine, D., and J. Alt-ma. 1982. Blot Bull 163: 144-153. 4. Moore, P., N. Scholz, and .J. Alcma. 1991. ./. Chan Ecol. 17(2): 1293-1307. 5. Basil, J., and J. Atema. 1994. Biol Bull 187:272-273. 6. Consi, T., F. Grasso, D. Mountain, and J. Atema. 1995. Biol. Bull 189:231-232. 7. Grasso, F., T. Consi, D. Mountain, and J. Atema. 1996. From Animals to Animals 4: Proceedings from the 4th Int. Conf. on Adaptive Behavior. MIT Press. Cambridge, MA (In Press). Reference: Kiol. Bull 191: 313-314. (October. 1996) Obstacles to Flow Produce Distinctive Patterns of Odor Dispersal on a Scale That Could be Detected by Marine Animals Kevin Dittmer, Frank Grasso, and Jelle Atema (Boston University Marine Program, Marine Biological Laboratory) Previous laboratory studies of odor dispersal in turbulence have demonstrated the existence of dynamic features in unob- structed jet plumes that could be used by lobsters and other marine animals as cues to the direction and distance of the odor source (1, 2). We undertook the present study to test whether simple obstacles introduced into the flow would affect the in- formational value of these dynamic features for an orienting animal. We studied two plumes in a fresh-water flow-through flume [for experimental apparatus see: (2)]. The plumes were formed by injecting salt water (with ethanol added for neutral buoy- ancy) at 100 ml/min (plume l)and 150 ml/min (plume 2) into the mean fresh-water flow (~1 cm/s). Measurements with a stationary conductivity probe (sampling resolution ~ 1 mm) were taken from an established plume, and the conductivity fluctuations prod
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