Time and energy use under thermoregulatory constraints in a diurnal rodent

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dc.contributor.authorBozinovic, F
dc.contributor.authorLagos, JA
dc.contributor.authorVásquez, RA
dc.contributor.authorKenagy, GJ
dc.date.accessioned2025-01-21T01:31:21Z
dc.date.available2025-01-21T01:31:21Z
dc.date.issued2000
dc.description.abstract(1) This study was designed to understand how thermoregulatory constraints affect the timing of foraging bouts and amount of food obtained from a feeding station that was subject to an intense heat load. (2) The degu, Octodon degus, is a diurnal re-dent inhabiting hot arid environments in Chile. Two-hour trials were run in a laboratory experimental arena to determine time allocation between a food station located under a heavy radiant heat source (2500 W/m(2)) and the rest of the arena, including a cool burrow. A video camera recorded the animal's movements during the trial, and tapes were analyzed afterwards for seven degus with a heated food site and seven degus with a normal, unheated food station. (3) Degus with a food patch exposed to heat spent less time foraging and harvested less food than animals with no heat load. Over a two hour period time use of the food patch was significantly less when heated than when not heated (0.65 +/- 0.59 vs 4.90 +/- 1.73 min, respectively). Thus the degus subjected to heat above their food source minimized time exposure to a physiologically stressful condition by decreasing their visits to the heated food source, thereby reducing food (= energy) intake. (4) Oxygen consumption (VO2), evaporative water loss (EWL) and body temperature (T-b) at air temperatures (T-air) of 33-34, 36-37, and 39-40 degrees C were also determined. The metabolic response to rising T-air amounted to a doubling of VO2 and a five-fold increase of EWL at T-air 39-40 degrees C, compared with 25 degrees C; and T-b rose above 42 degrees C. (5) Using data from these metabolic measurements together with a theoretical heating model, heating curves were obtained that suggested that degus can exploit patches of food for only about 3 min at 60 degrees C and 8 min at 50 degrees C. These simulations are in agreement with our observations that degus reduced their time spent feeding when there was a thermal constraint on foraging. (C) 2000 Elsevier Science Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.issn0306-4565
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97046
dc.identifier.wosidWOS:000085641400008
dc.issue.numero3
dc.language.isoen
dc.pagina.final256
dc.pagina.inicio251
dc.revistaJournal of thermal biology
dc.rightsacceso restringido
dc.subjectforaging behavior
dc.subjectthermoregulation
dc.subjectOctodon degus
dc.subjectheat stress
dc.subjectbehavioral thermoregulation
dc.subjecttime and energy use
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleTime and energy use under thermoregulatory constraints in a diurnal rodent
dc.typeartículo
dc.volumen25
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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