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5 ° n
2
81 ° n
2
Astronomical and Space Sciences not elsewhere classified
2
Biological Sciences not elsewhere classified
2
Ecology
2
Environmental Sciences not elsewhere classified
2
Inorganic Chemistry
2
Physiology
2
acoustic field observations
2
although differences
2
arctic krill
2
arctic krill (<
2
arctic ocean extends
2
arctic polar night
2
auroral components
2
characterize light across
2
circadian clock
2
constant darkness
2
darkest parts
2
div >< p
2
fundamental role
2
high latitudes
2
latitudinal gradient
2
light measurements demonstrate
light plays
2
lower latitudes
2
main migratory species
2
maximum extent
2
midnight sun
2
north pole
2
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