{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T17:01:52Z","timestamp":1791910912631,"version":"4.3.4"},"reference-count":68,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2013,8,1]],"date-time":"2013-08-01T00:00:00Z","timestamp":1375315200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Biol Rhythms"],"published-print":{"date-parts":[[2013,8]]},"abstract":"<jats:p>In mammals, the pineal hormone melatonin is thought to be essential to process environmental photoperiodic information. In this study, we demonstrate in a circannual species, the European hamster Cricetus cricetus, the existence of a melatonin-independent second pathway. In 4 physiological parameters (reproduction, body weight, activity pattern, body temperature), a large majority of pinealectomized European hamsters were entrained to an accelerated photoperiodic regime. It compressed the natural variations in the photoperiod to a 6-month cycle, which allowed us to record up to 6 complete physiological cycles during the life span of the individuals. We show further that whether a pinealectomized animal is able to entrain to changes in the photoperiod is influenced by the season of pinealectomy. The results do not disprove that melatonin is capable of entraining a circannual rhythm, but they show clearly that melatonin is not necessary, demonstrating another melatonin-independent pathway for circannual entrainment by the photoperiod. In view of these new insights, a revision of the original literature revealed that probably the melatonin-independent pathway plays an important role in most circannual mammals but only a minor role in photoperiodic species. Thus, the present work provides also the first evidence for different synchronization mechanisms in photoperiodic and circannual species.<\/jats:p>","DOI":"10.1177\/0748730413498561","type":"journal-article","created":{"date-parts":[[2013,8,8]],"date-time":"2013-08-08T14:49:43Z","timestamp":1375973383000},"page":"278-290","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":26,"title":["Photoperiod Can Entrain Circannual Rhythms in Pinealectomized European Hamsters"],"prefix":"10.1177","volume":"28","author":[{"given":"Stefanie","family":"Monecke","sequence":"first","affiliation":[{"name":"Institute for cellular and integrative neuroscience (INCI), Department Neurobiology of Rhythms, University of Strasbourg, Strasbourg, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominique","family":"Sage-Ciocca","sequence":"additional","affiliation":[{"name":"Chronobiotron, University of Strasbourg, Strasbourg, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franziska","family":"Wollnik","sequence":"additional","affiliation":[{"name":"Biological Institute, Department of Animal Physiology, University of Stuttgart, Stuttgart, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"P\u00e9vet","sequence":"additional","affiliation":[{"name":"Institute for cellular and integrative neuroscience (INCI), Department Neurobiology of Rhythms, University of Strasbourg, Strasbourg, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2013,8,8]]},"reference":[{"key":"bibr1-0748730413498561","doi-asserted-by":"publisher","DOI":"10.1177\/074873040001500206"},{"key":"bibr2-0748730413498561","first-page":"110","volume-title":"Melatonin and the Mammalian Pineal Gland","author":"Arendt 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