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Extraocular light perception in photoperiodic responses of the White-crowned sparrow (Zonotrichia leucophrys) and of the Golden-crowned sparrow (Z. atricapilla)

✍ Scribed by Gwinner, Eberhard G. ;Turek, Fred W. ;Smith, Susan D.

Publisher: Springer-Verlag
Year: 1971
Weight: 483 KB
Volume: 75
Category: Article
ISSN: 0044-362X
DOI: 10.1007/bf00340684

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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