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Indian Journal of Experimental Biology (IJEB) >
IJEB Vol.44 [2006] >
IJEB Vol.44(04) [April 2006] >
| Title: | Response to complete and skeleton photoperiods in subtropical male house sparrow, Passer domesticus (Linnaeus) |
| Authors: | Anushi
Bhardwaj, S K |
| Keywords: | Body mass
Passer domesticus
Photoinducible phase
Photoperiod
Testis |
| Issue Date: | Apr-2006 |
| Publisher: | CSIR |
| Abstract: | To examine the
importance of the inductive light period of a skeleton photoperiod in relation
to the endogenous circadian rhythm of photoinducibility mediating photoperiodic
induction, P. domesticus were exposed
for 28 weeks to a series of skeleton photoperiods, viz. 6L:4D:1L:13D,
6L:6D:1L:11D, 6L:8D:1L:9D and 6L:14D:1L:3D. The inductive effects of 1 hr light
pulse at night varied depending on the time of its placement. To compare the
inductive effects of complete and its corresponding skeleton photoperiods,
birds in the second experiment were subjected for 20 weeks to 12L:12D and
6L:5D:1L:12D given daily or interposed on alternate days with constant darkness
(12L:12D/DD and 6L:5D:1L:12D/DD). There was a difference in the rate and
magnitude of response between the complete and skeleton photoperiods. It
appears that the subtropical house sparrow uses photoperiodic strategy in
regulation of its seasonal testicular responses similar to that is reported for
its temperate population. |
| Page(s): | 325-329 |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.44(04) [April 2006]
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