Biological Rhythms_BlackBoardoutline

Biological Rhythms_BlackBoardoutline - Biological Rhythms...

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Biological Rhythms Biological rhythms o Occur when animal activities & behaviors can be related to environmental features that occur with regular frequencies o External manifestations of biological clocks Biological clocks o Self sustaining oscillators linked to and can be reset by the environment 2 aspects: self-sustaining and affected by environment Biological Rhythm characteristics o Composed of repeating units called - Cycles o Period - length of time required to complete an entire cycle o Amplitude - magnitude of change in activity level o Phase - any recognizable part of a cycle Biological Rhythm Properties (5) o 1) Temperature- compensated: relatively insensitive to change in temperature o 2) Biological clocks generally unaffected by metabolic poisons or inhibitors that block biochemical pathways within cells o 3) Periods of biological rhythms occur with approx. the same freq. as 1 or more environmental features
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o 4) self- sustaining, maintaining approx. normal cyclicity even in absence of environmental cues o 5) Most can be entrained by env. Cues Types of Rhythms Ultradian Rhythms (epicycles) o Variable length o Often very short 0. Ex. Lugworms (arenicola marina) eat every 6-8 mins; Meadow voles – 15-120 min intervals Tidal Rhythms (12.4 hrs)
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Biological Rhythms_BlackBoardoutline - Biological Rhythms...

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