Temporal Relationship between the Cycle of Testicular Development and Molt in the White-Crowned Sparrow, Zonotrichia-Leucophrys Gambelii
From Pubwiki
[edit] Author(s)
- Farner, D. S.
- Donham, R. S.
- Moore, M. C.
- Lewis, R. A.
[edit] Journal
Auk 97.1 (1980): 63-75.
[edit] Abstract
Male White-crowned Sparrows (Zonotrichia leucophrys gambelii) held on 12-h days for 46.5 months failed to develop a postnuptial-type molt, although they underwent 2-4 cycles of testicular growth and regression. At an estimated 47 days (range 43-59 days) after transfer to 18-h days, all began an essentially normal postnuptial molt of the primary remiges. The time elapsed between the loss of the first and ninth primary remiges was about 30 days, within normal range for this length of day. There was no identifiable relationship between size or rate of growth of the testes and the time of onset of the molt. These and other results indicate that there is a long-day ( > l 2 , <16 h) requirement for this molt. The hypotheses (1) that the role of long days in the induction of this molt is stimulatory, perhaps indirectly, or (2) that it entrains an endogenous circannual cycle involved in the control of molt are discussed in light of these results. Received 6 July 1979, accepted 12 October 1979.
[edit] Complete Publication (PDF; password required)
If you would like to join MIGRATE to get access to this publication, please email us!
