CHEMORECEPTION: LOCOMOTION AND ORIENTATION 

 30 



299 



Scyllorhinus sttllans 



120- 



o 

 o 



o 



a. 



September 10-12,1964 



equal flow in all 



compartment* 



scent of 



S. stellaris 



before stimulation — 



after stimulation 



n = 20€5 



n= !669 



Figure 20 Scyliorhinus stellaris: stimulation with the odor of a con- 

 specific significantly changes the frequency distribution of the 

 "jumps." From Kleerekoper (1967). 



jumps 



Figure 21 Scyliorhi?ius stellaris: left and right turns are affected differently as the animal 

 responds to the odor of a conspecific. From Kleerekoper (1967). 



were significantly avoided. Analysis of this response shows again that the 

 locomotor variable involved is that of turning behavior. Similar response was 

 described for the teleost Diplodus in the same experimental arrangement. 

 The modifications in turning behavior were not restricted to the cases in 

 which actual localization of the source compartment occurred but were 

 manifest also in the absence of accurate orientation. 



In all these experiments, olfactory stimulation resulted in a decrease of 

 the mean angle of turns which, in the peculiar spatial design of the monitor, 

 resulted in an increase over time of the number of different compartments 

 entered by the animals. In the absence of the dividers, that is, in an "open 

 field," the behavior would have resulted in a more intensive coverage of the 

 area and might have been called "searching." The results of the analysis of 



