caa a22 4500 605514364 CHVBK 20210128100704.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00360-015-0928-2 doi (NATIONALLICENCE)springer-10.1007/s00360-015-0928-2 Daily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizards [Elektronische Daten] [Colin Sanders, Glenn Tattersall, Michelle Reichert, Denis Andrade, Augusto Abe, William Milsom] This study was designed to determine the manner in which metabolism is suppressed during dormancy in black and white tegu lizards (Tupinambis merianae). To this end, heart rate (f H), respiration rate (f R), and deep body temperature (T b) were continuously monitored in outdoor enclosures by radio-telemetry for nine months. There was a continuous decline in nighttime breathing and heart rate, at constant T b, throughout the late summer and fall suggestive of an active metabolic suppression that developed progressively at night preceding the entrance into dormancy. During the day, however, the tegus still emerged to bask. In May, when the tegus made a behavioural commitment to dormancy, T b (day and night) fell to match burrow temperature, accompanied by a further reduction in f H and f R. Tegus, under the conditions of this study, did arouse periodically during dormancy. There was a complex interplay between changes in f H and T b associated with the direct effects of temperature and the indirect effects of thermoregulation, activity, and changes in metabolism. This interplay gave rise to a daily hysteresis in the f H/T b relationship reflective of the physiological changes associated with warming and cooling as preferred T b alternated between daytime and nighttime levels. The shape of the hysteresis curve varied with season along with changes in metabolic state and daytime and nighttime body temperature preferences. Springer-Verlag Berlin Heidelberg, 2015 Reptiles nationallicence Tegu lizards nationallicence Torpor nationallicence Dormancy nationallicence Hibernation nationallicence Cardiorespiratory control nationallicence Seasonal adjustments nationallicence Sanders Colin Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, BC, Canada aut Tattersall Glenn Department of Biological Sciences, Brock University, St. Catharines, ON, Canada aut Reichert Michelle Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, BC, Canada aut Andrade Denis Depto de Zoologia, Instituto Nacional de Ciência e Tecnologia em Fisiologia Comparada, Univ Estadual Paulista, 13506-900, Rio Claro, SP, Brazil aut Abe Augusto Depto de Zoologia, Instituto Nacional de Ciência e Tecnologia em Fisiologia Comparada, Univ Estadual Paulista, 13506-900, Rio Claro, SP, Brazil aut Milsom William Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, BC, Canada aut Journal of Comparative Physiology B Springer Berlin Heidelberg 185/8(2015-12-01), 905-915 0174-1578 185:8<905 2015 185 360 https://doi.org/10.1007/s00360-015-0928-2 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/s00360-015-0928-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sanders Colin Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Tattersall Glenn Department of Biological Sciences, Brock University, St. Catharines, ON, Canada aut NATIONALLICENCE 700 1- Reichert Michelle Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Andrade Denis Depto de Zoologia, Instituto Nacional de Ciência e Tecnologia em Fisiologia Comparada, Univ Estadual Paulista, 13506-900, Rio Claro, SP, Brazil aut NATIONALLICENCE 700 1- Abe Augusto Depto de Zoologia, Instituto Nacional de Ciência e Tecnologia em Fisiologia Comparada, Univ Estadual Paulista, 13506-900, Rio Claro, SP, Brazil aut NATIONALLICENCE 700 1- Milsom William Department of Zoology, University of British Columbia, 6270 University Blvd., V6T 1Z4, Vancouver, BC, Canada aut NATIONALLICENCE 773 0- Journal of Comparative Physiology B Springer Berlin Heidelberg 185/8(2015-12-01), 905-915 0174-1578 185:8<905 2015 185 360