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Termination of seasonal breeding in a weaver finch,Ploceus philippinus: Role of photoperiod

✍ Scribed by Chakravorty, Krishna ;Chandola-Saklani, Asha

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 375 KB
Volume: 235
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402350309

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✦ Synopsis

Seasonal gonadal regression in the photoperiodic weaver finch Ploceus philippinus occurs in the late summer despite the presence of long days. Earlier studies indicated a decline in photosensitivity in late summer, which might explain the failure of birds to respond to long days, resulting in gonadal regression. Results obtained in the present study suggest that 1) birds become refractory only to the stimulatory day lengths experienced in nature (longest day at 25" N 13.34 hr) and not to all long day lengths as in many other photoperiodic passerine species 2) birds become refractory in accordance with the day length they experience during the growth phase of the gonadal cycle. Thus birds held on 12 L/12 D become refractory to 12 L/12 D but are

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