Abstract
Abstract Daily injections of neurotransmitter‐affecting drugs induced spring migratory and reproductive conditions in white‐throated sparrows, Zonotrichia albicollis, during the fall. Injections of DOPA (catecholamine precursor) 12 h after 5‐HTP (serotonin precursor) was most stimulatory for development of spring conditions. Summer and fall conditions followed during subsequent months in a manner similar to the natural sequence. Changes in the temporal relations of circadian neural activities may account for seasonal alterations of metabolism and behavior.
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