. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 5cm FIGURE 1. Circular choice maze. The maze consists of six radial chambers connected via L-tubes to a central chamber. The system was run under constant illumination, salinity (33%), and temperature (14-18° C), with sterilized sand (3 hr at 290° C) covering the bottom of the central chamber. Water dripped into each of the radial chambers at a rate of 2 to 3 drops per sec. Water flowed from each of the radial chambers into a central chamber, which drained by a central standpipe. Arrows indicate the direction of water flow.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 5cm FIGURE 1. Circular choice maze. The maze consists of six radial chambers connected via L-tubes to a central chamber. The system was run under constant illumination, salinity (33%), and temperature (14-18° C), with sterilized sand (3 hr at 290° C) covering the bottom of the central chamber. Water dripped into each of the radial chambers at a rate of 2 to 3 drops per sec. Water flowed from each of the radial chambers into a central chamber, which drained by a central standpipe. Arrows indicate the direction of water flow. Statistical analyses are based on the assumption that the distribution of crabs in the radial chambers is related to their ability to sense a change in the chemical environment. Chi-square values were calculated for each trial to test if there was a preference for the chamber with the body odor. Heterogeneity Chi-square anal- yses were performed to check the validity of combining all the replicate trials within each treatment group so that an overall Chi-square test could be performed. All tests met this condition, except for the response to Modiolus odor, in which female crabs showed an attraction, but males and subadults did not. Chi-square tests were then performed for the compiled data using the level of significance. RESULTS The control tests demonstrate that the crabs had no preference for any single radial chamber (N = 140, %- — , P > ). Single-stimulus experimental tests show that intact crabs removed from specimens of Mytilns were highly at- tracted to Mytilns host odor and did not respond significantly to odor from Argo- TABLE I Effects of bivalve odors on P. maculatus searching behavior. Stimulus % Excited % Attracted N X2* p Mytilus odor 129 Argopecten odor 97 > Modiolus odor Female crabs 45 * Chi-square values determined by comparing number of crabs attracted to the radial chamber
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
