Biological Rhythms

Rhodes Quater 4

diurnal

active by day

nocturnal

active by night

crepusuclar

active by dusk/dawn

circadian

based upon the solar day (24 hrs)

circatidal

tidal activity period (12hrs 25min)

moons gravitational field

causes tides

high tide

bulges on one side

low tide

less on one side

circalunar

29 days

spring tides

particularly high tides twice a month

when do spring tides happen

when moon, sun, and earth are in alignment

neap tide

hard to differentiate low and high tide

when do neap tides happen

sun and moon are perpindicular

what moon phase do neap tides happen

first and third quarter phases

circannual

365 days

winter season

days shorter, sun rises less

what are circannual rythmns related to

migratory patterns, hibernation, dormancy

what phase do spring tides happen

full moon and new moon

circasemilunar

every two months