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Author |
Hoffmann, K. |
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Title |
Photoperiod, Pineal, Melatonin and Reproduction in Hamsters |
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Journal Article |
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Year |
1979 |
Publication |
Progress in Brain Research |
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52 |
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397–415 |
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Animals |
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Abstract |
This chapter discusses the experiments done on male hamsters. It should be noted, however, that corresponding results have been obtained in females in nearly all cases, regardless of whether photoperiodic effects, the results after pineal manipulations or after application of melatonin are considered. Many mammalian species show a marked annual cycle of gonadal and other functions. In a number of cases it has been shown that the photoperiod, that is, the length of the daily light cycle and its changes, are involved in the regulation of this cycle. The pineal has been shown to participate in the transduction of photoperiodic effects of short photoperiods leading to regression and also of long photoperiods stimulating recrudescence. The latter effect is not only a suppression of antigonadotrophic effects from the pineal, but a positive stimulation. The exact role of melatonin in the photoperiodic mechanism and its site of action are still unclear. Strong effects of melatonin application have been found in photoperiodic mammals. Recent experiments suggest that not only the amount of melatonin, but its pattern of synthesis and release may be important in the conveyance of photoperiodic effects. No support for the assumption that the site of action of melatonin is the pineal itself has been found in experiments with pinealectomized animals. |
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LoNNe @ christopher.kyba @ |
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424 |
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Author |
Hoffmann, K. |
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Title |
Photoperiodic effects in the Djungarian hamster: one minute of light during darktime mimics influence of long photoperiods on testicular recrudescence, body weight and pelage colour |
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Journal Article |
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Year |
1979 |
Publication |
Experientia |
Abbreviated Journal |
Experientia |
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35 |
Issue |
11 |
Pages |
1529-1530 |
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Keywords |
Animals |
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In male Djungarian hamsters (Phodopus sungorus) short photoperiods (L/D 8/16) with additional 1- or 5-min light-pulses 8 h after light-off were as effective as long photoperiods (L/D 16/8) in stimulating testicular recrudescence, increase in body weight and moult into summer pelage. The results are discussed with regard to the hypothesis that the pattern of melatonin release from the pineal gland is important in mediating photoperiodic effects in mammals. |
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0014-4754 |
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LoNNe @ christopher.kyba @ |
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425 |
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Holt, C.S.; Waters, T.F. |
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Title |
Effect of Light Intensity on the Drift of Stream Invertebrates |
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Journal Article |
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Year |
1967 |
Publication |
Ecology |
Abbreviated Journal |
Ecology |
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48 |
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2 |
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225 |
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0012-9658 |
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LoNNe @ christopher.kyba @ |
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426 |
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McFarlane, R.W. |
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Title |
Disorientation of loggerhead hatchlings by artificial road lighting |
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1963 |
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Copeia |
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1963 |
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1 |
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153 |
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LoNNe @ christopher.kyba @ |
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427 |
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Author |
Corbet, P.S. |
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Title |
Lunar Periodicity of Aquatic Insects in Lake Victoria |
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Journal Article |
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Year |
1958 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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182 |
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4631 |
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330-331 |
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0028-0836 |
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LoNNe @ christopher.kyba @ |
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428 |
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