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Author Hoffmann, K.
Title Photoperiod, Pineal, Melatonin and Reproduction in Hamsters Type Journal Article
Year 1979 Publication Progress in Brain Research Abbreviated Journal
Volume 52 Issue Pages 397–415
Keywords Animals
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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Call Number LoNNe @ christopher.kyba @ Serial 424
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Author Hoffmann, K.
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 Type Journal Article
Year 1979 Publication Experientia Abbreviated Journal Experientia
Volume 35 Issue 11 Pages 1529-1530
Keywords Animals
Abstract 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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ISSN 0014-4754 ISBN Medium
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Call Number LoNNe @ christopher.kyba @ Serial 425
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Author Holt, C.S.; Waters, T.F.
Title Effect of Light Intensity on the Drift of Stream Invertebrates Type Journal Article
Year 1967 Publication Ecology Abbreviated Journal Ecology
Volume 48 Issue 2 Pages 225
Keywords Animals
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ISSN 0012-9658 ISBN Medium
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Call Number LoNNe @ christopher.kyba @ Serial 426
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Author McFarlane, R.W.
Title Disorientation of loggerhead hatchlings by artificial road lighting Type Journal Article
Year 1963 Publication Copeia Abbreviated Journal
Volume 1963 Issue 1 Pages 153
Keywords Animals
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Call Number LoNNe @ christopher.kyba @ Serial 427
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Author Corbet, P.S.
Title Lunar Periodicity of Aquatic Insects in Lake Victoria Type Journal Article
Year 1958 Publication Nature Abbreviated Journal Nature
Volume 182 Issue 4631 Pages 330-331
Keywords Animals
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ISSN 0028-0836 ISBN Medium
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Call Number LoNNe @ christopher.kyba @ Serial 428
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