ISSN:
1432-1955
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The cercaria of Cryptocotyle lingua responds to the onset of mechanical vibrations and to a decrease in light intensity by an increase in activity. The cercaria shows a decline in activity with age and an increase in activity with increasing temperature. Stimulation by host extract also initiates an increase in activity and penetration behaviour. A similar series of responses were found with amines of chain length C7–C9. Evidence is presented that the activity rhythm, intrinsic to the tail, may be modified by a pacemaker in the body of the cercaria. This pacemaker may be influenced by a variety of exogenous and endogenous stimuli.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00328763