{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T06:36:02Z","timestamp":1777790162059,"version":"3.51.4"},"reference-count":29,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2001,2,1]],"date-time":"2001-02-01T00:00:00Z","timestamp":980985600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Biol Rhythms"],"published-print":{"date-parts":[[2001,2]]},"abstract":"<jats:p>\n                    Exposure to low ambient temperatures (T\n                    <jats:sub>a<\/jats:sub>\n                    ) accelerates appearance of the winter phenotype in Siberian hamsters transferred from long to short day lengths. Because melatonin transduces the effects of day length on the neuroendocrine axis, the authors assessed whether low T\n                    <jats:sub>a<\/jats:sub>\n                    promotes the transition to winterlike traits by accelerating the onset of increased nocturnal melatonin secretion or by enhancing responsiveness to melatonin in short day lengths. Male hamsters were transferred from 16L (16 h light\/day) to 8L (8 h light\/day) photoperiods and held at 5 \u00b0C or 22 \u00b0C. Locomotor activity was recorded continuously, and body mass, testis size, and pelage color were determined biweekly for 8 weeks. The duration of nocturnal locomotion ([.alpha]), a reliable indicator of the duration of nocturnal melatonin secretion, lengthened significantly earlier in hamsters exposed to a T\n                    <jats:sub>a<\/jats:sub>\n                    of 5 \u00b0C than 22 \u00b0C. Cold exposure increased the proportion of hamsters that were photoresponsive: gonadal regression in short days increased from 44% at 22 \u00b0C to 81% at 5 \u00b0C ( p &lt; 0.05); low T\n                    <jats:sub>a<\/jats:sub>\n                    did not, however, accelerate testicular regression in animals that were photoresponsive. Nonphotoresponsive animals at 5 \u00b0C temporarily had longer [.alpha]s during the first 4 weeks in short days and significant decreases in body mass and testicular size that were reversed during the ensuing weeks when [.alpha] decreased. In a 2nd experiment, pinealectomized male hamsters infused for 10 h\/day with melatonin for 2 weeks had significantly lower body and testes masses when maintained at 5 \u00b0C but not 22 \u00b0C. Low-ambient temperature appears to accelerate the appearance of the winter phenotype primarily by increasing target tissue responsiveness to melatonin and to a lesser extent by augmenting the rate at which the duration of nocturnal melatonin secretion increases in short day lengths.\n                  <\/jats:p>","DOI":"10.1177\/074873040101600109","type":"journal-article","created":{"date-parts":[[2009,4,17]],"date-time":"2009-04-17T18:54:26Z","timestamp":1239994466000},"page":"76-86","source":"Crossref","is-referenced-by-count":35,"title":["Low Ambient Temperature Accelerates Short-Day Responses in Siberian Hamsters by Altering Responsiveness to Melatonin"],"prefix":"10.1177","volume":"16","author":[{"given":"Jennie E.","family":"Larkin","sequence":"first","affiliation":[{"name":"Department of Psychology; University of California, Berkeley, CA 94720-1650, USA; Department of Psychology, University of California, 3210 Tolman Hall, Berkeley, CA 94720-1650, USA; ."}]},{"given":"David A.","family":"Freeman","sequence":"additional","affiliation":[{"name":"Department of Psychology; University of California, Berkeley, CA 94720-1650, USA"}]},{"given":"Irving","family":"Zucker","sequence":"additional","affiliation":[{"name":"Department of Psychology and Integrative Biology, University of California, Berkeley, CA 94720-1650, USA"}]}],"member":"179","published-online":{"date-parts":[[2001,2,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-079X.1993.tb00903.x"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1159\/000123405"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1210\/endo-113-4-1261"},{"key":"atypb4","first-page":"381","volume-title":"Testicular Development, Structure, and Function","author":"Desjardins C","year":"1980"},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.1002\/jez.1402300112"},{"key":"atypb6","doi-asserted-by":"publisher","DOI":"10.1007\/BF00191713"},{"key":"atypb7","doi-asserted-by":"publisher","DOI":"10.1177\/074873049701200202"},{"key":"atypb8","doi-asserted-by":"publisher","DOI":"10.1177\/074873049701200204"},{"key":"atypb9","doi-asserted-by":"publisher","DOI":"10.1095\/biolreprod53.1.116"},{"key":"atypb10","first-page":"R887","volume":"272","author":"Gorman MR","year":"1997","journal-title":"Am J Physiol"},{"key":"atypb11","doi-asserted-by":"publisher","DOI":"10.1159\/000124562"},{"key":"atypb12","first-page":"197","volume-title":"Suprachiasmatic Nucleus: The Mind's Clock","author":"Illnerova H","year":"1991"},{"key":"atypb13","doi-asserted-by":"publisher","DOI":"10.1159\/000123895"},{"key":"atypb14","doi-asserted-by":"publisher","DOI":"10.1159\/000124759"},{"key":"atypb15","doi-asserted-by":"publisher","DOI":"10.1139\/z81-151"},{"key":"atypb16","doi-asserted-by":"publisher","DOI":"10.1007\/BF01578752"},{"key":"atypb17","volume-title":"The Neurosciences: Third Study Program","author":"Pittendrigh C","year":"1974"},{"key":"atypb18","doi-asserted-by":"publisher","DOI":"10.1177\/074873099129000452"},{"key":"atypb19","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.100098597"},{"key":"atypb20","doi-asserted-by":"crossref","first-page":"R1041","DOI":"10.1152\/ajpcell.1996.271.4.C1041","volume":"271","author":"Prendergast BJ","year":"1996","journal-title":"Am J Physiol"},{"key":"atypb21","doi-asserted-by":"publisher","DOI":"10.1007\/BF00606119"},{"key":"atypb22","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-079X.1988.tb00656.x"},{"key":"atypb23","doi-asserted-by":"publisher","DOI":"10.1007\/s003600050063"},{"key":"atypb24","first-page":"104","volume":"267","author":"Ruf T","year":"1993","journal-title":"J Exp Biol"},{"key":"atypb25","volume-title":"Urinary 6-sulphatoxymelatonin as an Index of Pineal Function in the Djungarian Hamster: Influence of Photoperiod and Ambient Temperature","author":"Stieglitz A","year":"1994"},{"key":"atypb26","doi-asserted-by":"publisher","DOI":"10.1007\/BF00215082"},{"key":"atypb27","doi-asserted-by":"publisher","DOI":"10.1210\/endo-122-3-1094"},{"key":"atypb28","doi-asserted-by":"publisher","DOI":"10.1006\/gcen.1996.6853"},{"key":"atypb29","first-page":"167","volume":"57","author":"Weiner J","year":"1987","journal-title":"Symp Zool Soc Lond"}],"container-title":["Journal of Biological Rhythms"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/074873040101600109","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/074873040101600109","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T19:59:27Z","timestamp":1777492767000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/074873040101600109"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2001,2]]},"references-count":29,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2001,2]]}},"alternative-id":["10.1177\/074873040101600109"],"URL":"https:\/\/doi.org\/10.1177\/074873040101600109","relation":{},"ISSN":["0748-7304","1552-4531"],"issn-type":[{"value":"0748-7304","type":"print"},{"value":"1552-4531","type":"electronic"}],"subject":[],"published":{"date-parts":[[2001,2]]}}}