Photoperiodism in Hamsters: Abrupt Versus Gradual Changes in Day Length Differentially Entrain Morning and Evening Circadian Oscillators
dc.contributor.author | Gorman, Michael | en_US |
dc.contributor.author | Freeman, David | en_US |
dc.contributor.author | Zucker, Irving | en_US |
dc.date.accessioned | 2010-04-13T18:46:01Z | |
dc.date.available | 2010-04-13T18:46:01Z | |
dc.date.issued | 1997 | en_US |
dc.identifier.citation | Gorman, Michael; Freeman, David; Zucker, Irving (1997). "Photoperiodism in Hamsters: Abrupt Versus Gradual Changes in Day Length Differentially Entrain Morning and Evening Circadian Oscillators." Journal of Biological Rhythms 12(2): 122-135. <http://hdl.handle.net/2027.42/66702> | en_US |
dc.identifier.issn | 0748-7304 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/66702 | |
dc.description.abstract | In studies of photoperiodism, animals typically are transferred abruptly from a long (e.g., 16 h light per day [16L]) to a short (8L) photoperiod, and circadian oscillators that regulate pineal melatonin secretion are presumed to reentrain rapidly to the new photocycle. Among rats and Siberian hamsters, however, reentrainment rates vary depending on whether additional darkness is added to morning or evening, and a subset of hamsters (nonresponders) fails ever to reentrain normally to short photoperiods. The authors assessed whether several short-day responses occurred at different rates when darkness was extended into morning versus evening hours and the effectiveness of abrupt versus gradual shortening in day lengths (DLs). Entrainment patterns of photoresponsive hamsters also were compared to those of photononresponsive hamsters. Responsive hamsters transferred on a single day from 16L to 8L underwent more rapid gonadal regression, weight loss, decreases in follicle-stimulating hormone titers, and expansion of nocturnal locomotor activity when darkness was added to morning versus evening. When the dark phase was extended gradually by 8 h over 16 weeks, short-day responses occurred at the same rate whether darkness was appended to morning or evening or was added symmetrically. Darkness added to evening promoted more rapid short-day responses when it was added gradually rather than abruptly, despite the fact that average DLs were significantly shorter for the latter group. Among nonresponders, morning extensions of darkness transiently increased activity duration, whereas evening extensions did not. Gradual and abrupt decreases in DL differentially affect entrainment of evening and morning circadian oscillators. The authors argue for the incorporation of simulated natural photoperiods in studies of photoperiodism. | en_US |
dc.format.extent | 3108 bytes | |
dc.format.extent | 1169526 bytes | |
dc.format.mimetype | text/plain | |
dc.format.mimetype | application/pdf | |
dc.publisher | Sage Publications | en_US |
dc.subject.other | Testes | en_US |
dc.subject.other | Circadian Rhythms | en_US |
dc.subject.other | Follicle-stimulating Hormone | en_US |
dc.subject.other | Body Weight | en_US |
dc.subject.other | Melatonin | en_US |
dc.subject.other | Seasonality | en_US |
dc.title | Photoperiodism in Hamsters: Abrupt Versus Gradual Changes in Day Length Differentially Entrain Morning and Evening Circadian Oscillators | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Complementary and Alternative Medicine | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Psychology, University of California, Berkeley, CA 94720, Department of Psychology, University of Michigan, Ann Arbor, MI 48109 | en_US |
dc.contributor.affiliationother | Department of Physiology and Neurobiology, University of Connecticut, Storrs, CT 06269 | en_US |
dc.contributor.affiliationother | Department of Psychology and Intégrative Biology | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/66702/2/10.1177_074873049701200204.pdf | |
dc.identifier.doi | 10.1177/074873049701200204 | en_US |
dc.identifier.source | Journal of Biological Rhythms | en_US |
dc.identifier.citedreference | Bartness Tj and Goldman Bd (1988) Peak duration of serum melatonin and short-day responses in adult Siberian hamsters. Am J Physiol 255:R812-R822. | en_US |
dc.identifier.citedreference | Bartness Tj and Wade Gn (1984) Photoperiodic control of body weight and energy metabolism in Syrian hamsters (Mesocricetus auratus): Role of pineal gland, melatonin, gonads and diet. Endocrinology 114:492-498. | en_US |
dc.identifier.citedreference | Daan S. and Berde C. (1978) Two coupled oscillators: Simulations of the circadian pacemaker in mammalian activity rhythms. J Theor Biol 70:297-313. | en_US |
dc.identifier.citedreference | Duncan Mj, Goldman Bd, Di Pinto Mn, and Stetson Mh (1985) Testicular function and pelage color have different critical daylengths in the Djungarian hamster, Phodopus sungorus sungorus. Endocrinology 116:424-430. | en_US |
dc.identifier.citedreference | Elliott Ja and Tamarkin L. (1994) Complex circadian regulation of pineal melatonin and wheel-running in Syrian hamsters. J Comp Physiol A 174:469-484. | en_US |
dc.identifier.citedreference | Freeman Da and Goldman Bd (1997) Evidence that the circadian system mediates photoperiodic nonresponsiveness in Siberian hamsters: The effect of running wheel access on photoperiodic responsiveness. J Biol Rhythms 12:100-109. | en_US |
dc.identifier.citedreference | Goldman Bd (1991) Parameters of the circadian rhythm of pineal melatonin secretion affecting reproductive responses in Siberian hamsters. Steroids 56:218-225. | en_US |
dc.identifier.citedreference | Goldman Bd, Hall V., Hollister C., Reppert S., Roychoudhury P., Yellon S., and Tamarkin L. (1981) Diurnal changes in pineal melatonin content in four rodent species: Relationship to photoperiodism. Biol Reprod 24:778-783. | en_US |
dc.identifier.citedreference | Gorman Mr (1995) Seasonal adaptations of Siberian hamsters. I. Accelerated gonadal and somatic development in increasing versus static long day lengths. Biol Reprod 53:110-115. | en_US |
dc.identifier.citedreference | Gorman Mr and Zucker I. (1995a) Seasonal adaptations of Siberian hamsters. II. Pattern of change in day length controls annual testicular and body weight rhythms. Biol Reprod 53:116-125. | en_US |
dc.identifier.citedreference | Gorman Mr and Zucker I. (1995b) Testicular regression and recrudescence without subsequent photorefractoriness in Siberian hamsters. Am J Physiol 269:R800-R806. | en_US |
dc.identifier.citedreference | Gorman Mr and Zucker I. (in press-a) Environmental induction of photononresponsiveness in the Siberian hamster, Phodopus sungorus. Am J Physiol. | en_US |
dc.identifier.citedreference | Gorman Mr and Zucker I. (in press-b) Pattern of change in melatonin duration determines testicular responses in Siberian hamsters, Phodopus sungorus. Biol Reprod. | en_US |
dc.identifier.citedreference | Hastings Mh, Walker Ap, and Herbert J. (1987) Effect of asymmetrical reductions of photoperiod on pineal melatonin, locomotor activity and gonadal condition of male Syrian hamsters. J Endocrinol 114:221-229. | en_US |
dc.identifier.citedreference | Heldmaier G. and Steinlechner S. (1981) Seasonal control of energy requirements for thermoregulation in the Djungarian hamster (Phodopus sungorus), living in natural photoperiod. J Comp Physiol B 142:429-437. | en_US |
dc.identifier.citedreference | Hoffmann K. (1978) Effects of short photoperiods on puberty, growth and moult in the Djungarian hamster (Phodopus sungorus. J Reprod Fertil 54:29-35. | en_US |
dc.identifier.citedreference | Hoffmann K. (1982) The critical photoperiod in the Djungarian hamster Phodopus sungorus. In Vertebrate Circadian Systems: Structure and Physiology, J Aschoff, S Daan, and G Gross, eds, pp 297-304, Springer, New York. | en_US |
dc.identifier.citedreference | Hoffmann K. and Illnerova H. (1986) Photoperiodic effects in the Djungarian hamster: Rate of testicular regression and extension of pineal melatonin pattern depend on the way of change from long to short photoperiods. Neuroendocrinology 43:317-321. | en_US |
dc.identifier.citedreference | Illnerova H. (1991) The suprachiasmatic nucleus and rhythmic pineal melatonin production. In Suprachiasmatic Nucleus : The Mind's Clock, DC Klein, RY Moore, and SM Reppert, eds, pp 197-216, Oxford University Press, New York. | en_US |
dc.identifier.citedreference | Karp Jd, Dixon Me, and Powers Jb (1990) Photoperiod history, melatonin, and reproductive responses of male Syrian hamsters. J Pineal Res 8:137-152. | en_US |
dc.identifier.citedreference | Pittendrigh Cs (1974) Circadian oscillations in cells and the circadian organization of multicellular systems. In The Neurosciences: Third Study Program, FO Schmitt and FG Worden, eds, pp 437-458, MIT Press, Cambridge, MA. | en_US |
dc.identifier.citedreference | Puchalski W. and Lynch Gr (1986) Evidence for differences in the circadian organization of hamsters exposed to short day photoperiod. J Comp Physiol A 159:7-11. | en_US |
dc.identifier.citedreference | Puchalski W. and Lynch Gr (1988a) Characterization of circadian function in Djungarian hamsters insensitive to short day photoperiod. J Comp Physiol A 162:309-316. | en_US |
dc.identifier.citedreference | Puchalski W. and Lynch Gr (1988b) Daily melatonin injections affect the expression of circadian rhythmicity in Djungarian hamsters kept under a long-day photoperiod. Neuroendocrinology 48:280-286. | en_US |
dc.identifier.citedreference | Puchalski W. and Lynch Gr (1991a) Circadian characteristics of Djungarian hamsters: Effects of photoperiodic pretreatment and artificial selection. Am J Physiol 261:R670-R676. | en_US |
dc.identifier.citedreference | Puchalski W. and Lynch Gr (1991b) Expression of circadian rhythmicity in Djungarian hamsters under constant light: Effects of light intensity and the circadian system's state. J Comp Physiol A 169:185-189. | en_US |
dc.identifier.citedreference | Puchalski W. and Lynch Gr (1994) Photoperiodic time measurement in Djungarian hamsters evaluated from T-cycle studies. Am J Physiol 267:R191-R201. | en_US |
dc.identifier.citedreference | Watson-Whitmyre M. and Stetson Mh (1985) Mathematical method for estimating paired testes weight from in situ testicular measurements in three species of hamsters. Anat Rec 213:473-476. | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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