26Clocks06x

26Clocks06x - Biological clocks They're inside you They got...

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Biological clocks They’re inside you!
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They got rhythm! - many behaviours predictable timing - sometimes in absence of conspicuous stimuli - known stimuli do not always elicit e.g., roosters don’t crow every dawn - multiple rhythms
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1. Daily i. diurnal: old folks ii. nocturnal: crickets, moths, most mammals, young folks iii. crepuscular (=dawn & dusk): bird song - learning easier at some times of day Dark to dapper to delicate in 2002
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- sugar water at station at 3 different 2-hr intervals during day - 6-8 d training, food removed, bees on time - < 9 stations, each at different time - distinguish intervals of ~20 min - adaptive for? Bee foraging
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Mating - 1 genus fruit fly ( Dacux ) at twilight, others later - avoids wasting gametes, etc., on futile mating - rats & lever to electrodes in pleasure centres, < 5000 presses / hr! - eventually declines, & 24-hr rhythm - pleasure centres more receptive at some times of day (? near ovulation)
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2. Lunar day - when more important than solar? - tides (although not direct to lunar) - fiddler crabs feed during low tides; back to burrows before tides return
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3. Semilunar month (=14.75 d) -   tides when sun & moon in synch (full & new moons) e.g., grunion & spring (=max.) tides - ♀s vertical night after spring tide - several ♂s surround, milt thru sand to fertilise buried eggs - hatch in ~10 d; why? - if longer, washed away before mature; this way ready for next time Max height
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- as tide recedes, ♂s leave puparia - locate ♀ & help “undress” & copulate
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This note was uploaded on 02/08/2010 for the course BIOL 3143 taught by Professor Daveshutler during the Winter '10 term at Acadia.

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26Clocks06x - Biological clocks They're inside you They got...

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