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dc.contributor.authorTrondrud, Liv Monica
dc.contributor.authorPigeon, Gabriel
dc.contributor.authorKról, Elżbieta
dc.contributor.authorAlbon, Steve
dc.contributor.authorRopstad, Erik
dc.contributor.authorKumpula, Jouko
dc.contributor.authorEvans, Alina
dc.contributor.authorSpeakman, John R.
dc.contributor.authorLoe, Leif Egil
dc.identifier.citationPhysiological and Biochemical Zoology. 2023, 96 (4), 282-293.en_US
dc.description.abstractHeat waves are becoming more frequent across the globe and may impose severe thermoregulatory challenges for endotherms. Heat stress can induce both behavioral and physiological responses, which may result in energy deficits with potential fitness consequences. We studied the responses of reindeer (Rangifer tarandus tarandus), a cold-adapted ungulate, to a record-breaking heat wave in northern Finland. Activity, heart rate, subcutaneous body temperature, and body mass data were collected for 14 adult females. The post–heat wave autumn body masses were then analyzed against longitudinal body mass records for the herd from 1990 to 2021. With increasing air temperature during the day, reindeer became less active and had reduced heart rate and increased body temperature, reflecting both behavioral and physiological responses to heat stress. Although they increased activity in the late afternoon, they failed to compensate for lost foraging time on the hottest days (daily mean temperature ≥20°C), and total time active was reduced by 9%. After the heat wave, the mean September body mass of herd females (69.7±6.6 kg, n=52) was on average 16.4% ± 4.8% lower than predicted (83.4±6.0 kg). Among focal females, individuals with the lowest levels of activity during the heat wave had the greatest mass loss during summer. We show how heat waves impose a thermoregulatory challenge on endotherms, resulting in mass loss, potentially as a result of the loss of foraging time. While it is well known that environmental conditions affect large herbivore fitness indirectly through decreased forage quality and limited water supply, direct effects of heat may be increasingly common in a warming climate.en_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.subjectclimate changeen_US
dc.subjectheat dissipationen_US
dc.subjectbehavioral plasticityen_US
dc.titleA Summer Heat Wave Reduced Activity, Heart Rate, and Autumn Body Mass in a Cold-Adapted Ungulateen_US
dc.title.alternativeA Summer Heat Wave Reduced Activity, Heart Rate, and Autumn Body Mass in a Cold-Adapted Ungulateen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder2023 The University of Chicago.en_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.source.journalPhysiological and Biochemical Zoologyen_US

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Navngivelse-Ikkekommersiell 4.0 Internasjonal
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