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Journal of Experimental Biology, Vol 203, Issue 24 3795-3808, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
KS Mead and MA Koehl
Department of Integrative Biology, VLSB 3060, University of California at Berkeley, Berkeley, CA 94720-3140, USA. kmead@socrates.berkeley.edu
Many crustaceans detect odors from distant sources using chemosensory sensilla (aesthetascs) on their antennules. The greater the flow of water through arrays of aesthetascs, the faster the access of odorant to receptors inside the aesthetascs. Stomatopods facilitate odorant access by flicking their antennules, thus increasing the relative velocity of the water reaching their aesthetascs. We used dynamically scaled physical models to investigate how aesthetasc size and spacing and antennule flicking velocity affect flow penetration into the simple aesthetasc arrays of the stomatopod Gonodactylaceus mutatus. Particle image velocimetry of flow fields near models of juvenile and adult antennules revealed that velocity gradients around the aesthetascs are steeper during the outward part of the flick than during the return stroke and that the velocity gradients are steeper at the aesthetasc tips than at their bases. More fluid per unit time flows between aesthetasc rows during the outward stroke than during the return stroke, ensuring that odor sampling is pulsatile. During flicking, velocity gradients are steeper near adult aesthetascs than near juvenile aesthetascs, and adults process more fluid per unit time than juveniles. The resulting differences in odorant access can be related to size- and age-dependent changes in stomatopod ecology.
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 J. R. Mccall and K. S. Mead Structural and Functional Changes in Regenerating Antennules in the Crayfish Orconectes sanborni Biol. Bull., April 1, 2008; 214(2): 99 - 110. [Abstract] [Full Text] [PDF]
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D. Mellon Jr and J. A. C. Humphrey Directional asymmetry in responses of local interneurons in the crayfish deutocerebrum to hydrodynamic stimulation of the lateral antennular flagellum J. Exp. Biol., September 1, 2007; 210(17): 2961 - 2968. [Abstract] [Full Text] [PDF]
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K. S. Mead, M. B. Wiley, M. A. R. Koehl, and J. R. Koseff Fine-scale patterns of odor encounter by the antennules of mantis shrimp tracking turbulent plumes in wave-affected and unidirectional flow J. Exp. Biol., January 1, 2003; 206(1): 181 - 193. [Abstract] [Full Text] [PDF]
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K. S. Mead From Odor Molecules to Plume Tracking: An Interdisciplinary, Multilevel Approach to Olfaction in Stomatopods Integr. Comp. Biol., April 1, 2002; 42(2): 258 - 264. [Abstract] [Full Text] [PDF]
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 M. A. R. Koehl, J. R. Koseff, J. P. Crimaldi, M. G. McCay, T. Cooper, M. B. Wiley, and P. A. Moore Lobster Sniffing: Antennule Design and Hydrodynamic Filtering of Information in an Odor Plume Science, November 30, 2001; 294(5548): 1948 - 1951. [Abstract] [Full Text] [PDF]
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