caa a22 4500 605514356 CHVBK 20210128100704.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00360-015-0929-1 doi (NATIONALLICENCE)springer-10.1007/s00360-015-0929-1 How to spend the summer? Free-living dormice ( Glis glis ) can hibernate for 11 months in non-reproductive years [Elektronische Daten] [Franz Hoelzl, Claudia Bieber, Jessica Cornils, Hanno Gerritsmann, Gabrielle Stalder, Chris Walzer, Thomas Ruf] Edible dormice are arboreal rodents adapted to yearly fluctuations in seed production of European beech, a major food source for this species. In years of low beech seed abundance, dormice skip reproduction and non-reproductive dormice fed ad libitum in captivity can display summer dormancy in addition to winter hibernation. To test whether summer dormancy, that is, a very early onset of hibernation, actually occurs in free-living dormice, we monitored core body temperature (T b) over~12months in 17 animals during a year of beech seeding failure in the Vienna Woods. We found that 8 out of 17 dormice indeed re-entered hibernation as early as in June/July, with five of them having extreme hibernation durations of 11months or more (total range: 7.8-11.4months). Thus, we show for the first time that a free-living mammal relying on natural food resources can continuously hibernate for>11months. Early onset of hibernation was associated with high body mass in the spring, but the distribution of hibernation onset was bimodal with prolonged hibernation starting either early (prior to July 28) or late (after August 30). This could not be explained by differences in body mass alone. Animals with a late hibernation onset continued to maintain high nocturnal T b's throughout summer but used short, shallow torpor bouts (mean duration 7.44±0.9h), as well as occasional multiday torpor for up to 161h. The Author(s), 2015 Summer dormancy nationallicence Torpor nationallicence Reproduction nationallicence Seasonality nationallicence Foraging nationallicence Body mass nationallicence Hoelzl Franz Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Bieber Claudia Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Cornils Jessica Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Gerritsmann Hanno Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Stalder Gabrielle Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Walzer Chris Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Ruf Thomas Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut Journal of Comparative Physiology B Springer Berlin Heidelberg 185/8(2015-12-01), 931-939 0174-1578 185:8<931 2015 185 360 https://doi.org/10.1007/s00360-015-0929-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00360-015-0929-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hoelzl Franz Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 700 1- Bieber Claudia Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 700 1- Cornils Jessica Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 700 1- Gerritsmann Hanno Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 700 1- Stalder Gabrielle Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 700 1- Walzer Chris Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 700 1- Ruf Thomas Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Savoyenstraße 1, 1160, Vienna, Austria aut NATIONALLICENCE 773 0- Journal of Comparative Physiology B Springer Berlin Heidelberg 185/8(2015-12-01), 931-939 0174-1578 185:8<931 2015 185 360