Influence of Photoperiod Duration on Fecal Androgen Content in Migratory Reed Bunting Emberiza schoeniclus and Non-migra tory Meadow Bunting Emberiza cioides Males

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Fecal androgen levels of migratory reed bunting Emberiza schoeniclus and non-migratory meadow bunting Emberiza cioides males were measured by radioimmunoassay after extraction with ether.When the photoperiod conditions were changed stepwise from 10 h light/14 h darkness (LD 10:14) to LD 15:9, in the migratory reed bunting the fecal androgen contents increased significantly at LD 12:12, and these relative high levels were maintained at LD 14:10.The photoperiod conditions resulting in high fecal androgen contents were similar to those resulting in nocturnal migratory restlessness.On the other hand, no significant change was observed in the non-migratory meadow bunting.The fecal androgen content would reflect the levels circulating in the plasma, as has been reported for the Japanese Quail.It has been suggested that androgen may be an endocrine regulator of vernal migration.Thus, androgen may be involved in the control of the vernal migration in the reed bunting.
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