| | OVARIAN GROWTH IN TREE SPARROWS (SPIZELLA ARBOREA) |
 | | Moreover, although a circadian oscillation in photosensitivity apparently is involved in the control of ovarian growth in Japanese Quail (Follett and Sharp, 1969), there is no evidence for or against involvement of a similar oscillation in the control of photoperiodic ovarian growth in species that breed seasonally. |
 | | In this report, we describe the temporal course and rate of ovarian growth in Tree Sparrows (Spizella arborea) exposed to daylengths of 8, 11, 15, or 20 hours and examine rate of photoinduced ovarian growth as a function of daylength. |
 | | In addition, we report results of a preliminary experiment that suggest a circadian oscillation operates in the photoperiodic ovarian response of the Tree Sparrow. |
| elibrary.unm.edu /sora/Auk/v089n01/p0146-p0155.html (4511 words) |