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Photoperiodic control of antler cycles in deer. IV. Effects of constant light:dark ratios on circannual rhythms

✍ Scribed by Goss, Richard J.

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 425 KB
Volume: 201
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402010305

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✦ Synopsis

Abstract

Yearling sika deer, when exposed to constant unequal photoperiods since the autumnal equinox, replace their antlers the next spring and at irregular intervals thereafter. On equatorial light cycles (12L: 12D) they retain their original antlers indefinitely. The changeover occurs between constant day lengths of 12 3/4 and 13 hours. Since yearlings held on 6L:6D:6L:6D are able to replace their antlers on schedule, the failure to do so on 12L:12D is not due to light:dark parity, but to the 12‐hour durations of the days and/or nights.

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Photoperiodic control of antler cycles in deer: VII. Role of light vs. dark in suppression of circannual rhythms

✍ Goss, Richard J. 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 357 KB

The antler replacement cycle in the sika deer (Ceruus nippon) is abolished on simulated equatorial photoperiods (12L/12D), the old antlers failing to be regenerated for indefinite durations. Constant but unequal light and dark periods have been shown to permit expression of circannual rhythms,