. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACEAN CHEMOSENSITIVITY 533 CM 'o UJ o a °-6 OL O UJ z O Q. UJ or C. antennarius • Dactyl O Maxilliped. io"2 icf3 icT4 icT5 MOLARITY FIGURE 4. The average relative responses of 13 dactyl and 8 maxilliped preparations to a range of amino acid mixture concentrations. Receptor response to 10~2 M is arbitrary unity. Response intensity calculated from first 10 seconds of response. vious behavioral studies have shown Panulinis argus to initiate feeding activity in the presence of IO4 M amino acid (Leva
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACEAN CHEMOSENSITIVITY 533 CM 'o UJ o a °-6 OL O UJ z O Q. UJ or C. antennarius • Dactyl O Maxilliped. io"2 icf3 icT4 icT5 MOLARITY FIGURE 4. The average relative responses of 13 dactyl and 8 maxilliped preparations to a range of amino acid mixture concentrations. Receptor response to 10~2 M is arbitrary unity. Response intensity calculated from first 10 seconds of response. vious behavioral studies have shown Panulinis argus to initiate feeding activity in the presence of IO4 M amino acid (Levandowsky and Hodgson, 1965), and Homanis americanns to initiate food-search activity in the presence of 10~6 M amino acid (McLeese, 1970). The electrophysiological thresholds for dactyl and third maxilliped receptors of C. antennarius were IO"5 M amino acid mixture. This is in agrement with the sen- sitivity found in the dactyl receptors of another brachyuran crab, Carcinus maenas (Case and Gwilliam, 1961). The dactyl receptor threshold of G. ingens (10~8 M amino acid mixture) is the lowest threshold reported in crustacean receptors, approximating both the antennal receptor threshold of this species (10~T M amino acid mixture) and the antennular receptor threshold of IO"7 M amino acid reported in Homarns americanus (Ache, 1972; Shepheard, 1974). It has been postulated that, among the decapods, the dactyls, with lower chemosensitivity, function as contact chemoreceptors, while the more chemically sensitive antennules serve as distance receptors (Shepheard, 1974). Judging from the high chemo-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-19
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