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5 ° n
4
81 ° n
4
Astronomical and Space Sciences not elsewhere classified
4
Biological Sciences not elsewhere classified
4
Ecology
Environmental Sciences not elsewhere classified
Inorganic Chemistry
4
Physiology
4
acoustic field observations
4
although differences
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arctic krill
4
arctic krill (<
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arctic ocean extends
4
arctic polar night
4
auroral components
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characterize light across
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circadian clock
4
constant darkness
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darkest parts
4
div >< p
4
fundamental role
4
high latitudes
4
latitudinal gradient
4
light measurements demonstrate
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light plays
4
lower latitudes
4
main migratory species
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maximum extent
4
midnight sun
4
north pole
4
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