Abstract
Photosensitive male blackheaded buntings were held under six different light cycles consisting of a 6-hour main photophase coupled with scotophases of various durations (6L/6 (2 n+1) D). Testicular growth was stimulated in buntings by cycle lengths of 12-(6L∶6D), 36-(6L∶30D) and 60-hours (6L∶54D), but not by cycles of 24-(6L∶18D), 48-(6L∶42D) and 72-hours (6L∶66D). These results are consistent with the Bunning hypothesis and indicate that an endogenous rhythm with a period of approximately 24 hours plays a role in the initiation of testicular growth in this bird.
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