March 9 lecture handout

March 9 lecture handout - 3/8/2012 Rhythmic Activities All...

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3/8/2012 1 Rhythmic Activities • All eukaryotic organisms have a biological clock that regulates their activities • Nearly all activities mentioned in this class all quarter long have some kind of temporal pattern Rhythm : a change with time that is repeated in a particular pattern Endogenous rhythm : the timing actually comes form the organism itself - the organism has its own internal clock Exogenous rhythm : dictated by rhythmic phenomena outside of the organism - sunrise/sunset or seasonal changes Temporal Scales • Daily (Circadian) • Monthly Rhythms • Annual Rhythms From an experimental point of view, which of these is harder to document?
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3/8/2012 2 Environmental Reinforcement • What is rhythmic besides animals? – Light intensity – Temperature – Relative humidity – Barometric pressure – Cosmic radiation • All of these factors have influence on animal behaviors Daily Rhythms • Honeybees time floral visits • Experimental design – Foraging honeybees were marked and trained
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March 9 lecture handout - 3/8/2012 Rhythmic Activities All...

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