Department of Zoology, Banaras Hindu University, Varanasi 221005, India
(Received 16 September 1974)
Almost all birds investigated so far have been shown to respond to artificial illumination irrespective of their tropical or temperate distribution (see reviews Chandola, Thapliyal & Murty, 1973; Follett, 1973; Lofts & Lam, 1973) with the exception of a subtropical finch, spotted munia, Lonchura punctulata (Chandola & Thapliyal, 1973). We have now undertaken a systematic investigation of the photoresponses of this bird which is widely distributed in the Indian subcontinent (16–30° N) and report our preliminary findings here.
Adult birds were caught in the wild and, after an acclimatization period of 15 days, were weighed and the gonads inspected at laparotomy. Male birds were separated into groups of 12 and subjected to light treatments as indicated in Tables 1 and 2. In one series 3 h light: 23 h darkness (3 L: 23 D), an ahemeral light
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