Plant and animal behaivours DEFINITIONS Flashcards
Definition of “Zeitgeber”
An external environmental cue.
Definition of “Entrainment”
The synchronization or alignment of the internal biological rhythm. The internal clock must continually ‘reset’ itself by the environment.
Definition of “Endogenous Rhythm”
Internally driven rhythm; involves an internal ‘clock’ and independent of changes in the external environment.
Definition of “Exogenous Rhythm”
Externally driven rhythm; solely dependent of the changes in the external environment.
Definition of “Circadian Rhythm”
24 hour internal ‘clock’ which regulates an organisms sleep-wake cycle.
Definition of “Circannual Rhythm”
An annual rhythm (one year).
Definition of “Circatidal Rhythm”
A rhythm that matches the movement of the tides and has a period of ~12.5 hours.
Definition of “Circalunar Rhythm”
A rhythm that cycles over an approximately 29.5 day period in response to the moon cycle.
