. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMORECEPTION AND BEHAVIOR IN ASTEROIDS 415 broken clam situations and was absent from all turning angle analysis. Analysis of the initial directional choices of sea stars during clam stimulation showed a significant directional choice towards the odor source for the broken clam only (The I' test, M = 0°, u = P < , Fig. 3). All other heading angles were uniformly distributed around the circle, indicating no significant initial head- ing angle. Ahissel. Sea stars did not alter either their walking speed or the NC
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMORECEPTION AND BEHAVIOR IN ASTEROIDS 415 broken clam situations and was absent from all turning angle analysis. Analysis of the initial directional choices of sea stars during clam stimulation showed a significant directional choice towards the odor source for the broken clam only (The I' test, M = 0°, u = P < , Fig. 3). All other heading angles were uniformly distributed around the circle, indicating no significant initial head- ing angle. Ahissel. Sea stars did not alter either their walking speed or the NCR in any of the trials involving either mussels, broken mussels or empty mussel shells when compared to control values (Fig. 2). There was a signifi- cant change in heading angles for both the whole and broken mussel trials. Sea stars significantly decreased their heading angles as they approached the odor source (Table I). This relationship was absent from heading an- gles for the control and empty mussel shell and was ab- sent from all turning angle analysis. Analysis of the ini- tial directional choices of sea stars during mussel stimu- lation showed that there was not a significant directional choice towards the odor source for any of the odor stim- ulations (Fig. 4). Discussion In previous orientation studies using sea stars, it has been difficult to differentiate between a true chemically mediated response, in which the animal is responding only to the odors, and a combination of chemically and mechanically mediated responses. In fact. Rochette el al. (1994) showed conclusively that Leptasteriaspolaris has a strong orientation response to current in both the pres- ence and absence of chemical stimulation. The orienta- tion behavior that results from multiple inputs of che- mosensory and mechanosensory information could be due to a range of orientation strategies from a chemically triggered rheotaxis to a flow-triggered chemotaxis (for a review of different orientation st
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
