The continuous administration of melatonin via intraperitoneally placed Silastic capsules resulted in a clear reduction in the total amount of perch hopping activity recorded from sparrows maintained on either LD 3:21 or LD 8:16. Removal of the melatonin-filled capsules restored the level of locomotor activity to that seen prior to capsule implantation. These results, in conjunction with a previous study demonstrating that melatonin can alter the circadian rhythm of locomotor activity in sparrows, suggest that the pineal product melatonin plays a role in both the timing and the amount of activity expressed throughout the activity-rest cycle in birds.
- House sparrows
- Locomotor activity
ASJC Scopus subject areas
- Experimental and Cognitive Psychology
- Behavioral Neuroscience