Effects of pinealectomy and subsequent melatonin implants on activity rhythms in the house finch (Carpodacus mexicanus)
Activity patterns were analyzed in house finches (C. mexicanus ) which were pinealectomized and subsequently implanted with melatonin capsules. Most pinealectomized house finches showed loss of circadian perch-hopping rhythms in constant darkness (DD). In a light-dark cycle (LD) with 8 h L and 16 h...
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| Published in: | Journal of Comparative Physiology ? A Vol. 153; no. 3; pp. 413 - 419 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
01-01-1983
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Activity patterns were analyzed in house finches (C. mexicanus ) which were pinealectomized and subsequently implanted with melatonin capsules. Most pinealectomized house finches showed loss of circadian perch-hopping rhythms in constant darkness (DD). In a light-dark cycle (LD) with 8 h L and 16 h D, activity in pinealectomized birds was redistributed such that an increase in activity during phase lead counter-balanced a decrease during L. Melatonin capsules implanted in pinealectomized finches shortened phase lead in LD and lengthened phase trail. Melatonin did not restore circadian rhythmicity in pinealectomized finches and instead was associated with a decline in signs of residual, damped rhythmicity. |
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| Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
| ISSN: | 0340-7594 1432-1351 |
| DOI: | 10.1007/BF00612595 |