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Science 2 March 1979:
Vol. 203. no. 4383, pp. 918 - 920
DOI: 10.1126/science.570304
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Articles

Science, Vol 203, Issue 4383, 918-920
Copyright © 1979 by American Association for the Advancement of Science

articles

Hormone changes triggered by aggression in a natural population of blackbirds

CF Harding and BK Follett

The concentrations of hormones in the plasma of male red-winged blackbirds caught at the height of an aggressive encounter are significantly different from those in males that have not recently engaged in aggressive behavior. Concentrations of luteinizing hormone in the plasma are decreased in the aggressive males, whereas androgen concentrations are affected in a more complex manner. Concentrations of corticoids do not appear to be affected by aggressive behavior.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)