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Effects of Light Intensity and Day-Length on Reproduction in the English Sparrow

✍ Scribed by HAWKINS, T. H.

Book ID
109560198
Publisher
Nature Publishing Group
Year
1949
Tongue
English
Weight
238 KB
Volume
163
Category
Article
ISSN
0028-0836

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## Abstract Plasma levels of LH were measured through the course of 24 hours in photosensitive and photorefractory, adult male white‐crowned sparrows, __Zonotrichia leucophrys gambelii__, exposed to both long (20L, 4D) and short (8L, 16D) days. In photorefractory birds held on both long and short d