Body temperature variation of South African antelopes in two climatically contrasting environments

Shrestha, Anil; Wieren, S.E. van; Langevelde, Frank van; Fuller, Andrea; Hetem, Robyn S.; Meyer, Leith C. R.; Bie, S. de; Prins, Herbert H. T.

doi:10.1016/j.jtherbio.2011.12.008

Cited by 14 publications

(14 citation statements)

References 63 publications

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“…Our modified vaginal implant transmitters (VITs) were successful in collecting continuous body‐temperature measurement in adult female moose. These continuous temperature loggers revealed changes in body temperature in moose similar to surgical implants observed in other ungulates (Fuller et al , Hetem et al , Shrestha et al ). In 4 moose (3 captive and 1 wild), TVITs collected data that were improbable, likely because of shallow depth of insertion measured in the captive moose (<16 cm).…”

Section: Discussionsupporting

confidence: 63%

“…Rectal temperature has been recorded while animals are anesthetized or restrained, but cannot be recorded after release (Franzmann , Parker and Robbins , Renecker and Hudson , Rostal et al , Brivio et al ). Surgical implants into the abdominal cavity have gathered valuable data on body temperature; however, data must be transmitted constantly via radio transmission to a receiver (Sargeant et al ), or data stored within the temperature logger must be retrieved by surgery, which can pose risks to animals’ health and is difficult to do on large wild ungulates, or by euthanasia (Fuller et al , Lust et al , Hébert et al , Hetem et al , Shrestha et al ). Ruminal transmitter units can record continuous body temperature and do not require surgery (Signer et al , Turbill et al ), but diet‐induced thermogenesis and drinking events influence rumen temperature (Lawler and White , Crater and Barboza ).…”

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confidence: 99%

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Vaginal implant transmitters for continuous body temperature measurement in moose

et al. 2018

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Measuring body temperature in free-ranging ungulates is challenging. We evaluated a vaginal implant transmitter (TVIT) modified to collect continuous body temperature of captive and wild female moose (Alces alces) in Alaska, USA. We deployed TVITs in 18 moose between 2014 and 2016. We manually removed the TVIT after 51-338 days of deployment and sampled vaginal bacterial flora to assess negative effects of TVIT retention. For comparison, we also sampled vaginal flora from moose that did not have a TVIT. Mean bacterial growth scores were greater for moose with a TVIT than representative vaginal swabs from moose without a TVIT. The TVIT adequately collected body temperature measurements; however, the TVIT design could be improved to fit young, nulliparous moose. TVITs can be easily deployed and removed, but are limited by battery life, can only be deployed in adult female moose, and may increase vaginal bacterial concentrations. Ó

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Section: Discussionsupporting

confidence: 63%

mentioning

confidence: 99%

Vaginal implant transmitters for continuous body temperature measurement in moose

et al. 2018

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 , the mean, minimum and maximum of the nychthemeral rhythms of body temperatures of our cheetahs fell within the 95% confidence intervals of regression lines fitted to the relationship between body temperature and body mass for 17 species of free-living mammalian herbivores . Indeed, the body temperature rhythms of our cheetahs were remarkably similar to those of their ungulate prey exposed to similar environmental conditions in southern Africa (Fuller et al 2000;Maloney et al 2002;Hetem et al 2008;Shrestha et al 2012). Contrary to our hypothesis, seasonal periods had little influence on the cheetahs' body temperature and rhythm, despite the hot-dry period being characterized by high wind speeds and average black globe temperatures that were 10 °C higher than those in the cool-dry period, and both water vapor pressure and rainfall that was higher in the warm-wet than the other 2 periods.…”

Section: Discussionsupporting

confidence: 53%

Body temperature, activity patterns and hunting in free‐living cheetah: biologging reveals new insights

Hetem

Mitchell

Witt

et al. 2019

Integrative Zoology

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As one of the few felids that is predominantly diurnal, cheetahs (Acinonyx jubatus Von Schreber, 1775) can be exposed to high heat loads in their natural habitat. Little is known about long-term patterns of body temperature and activity (including hunting) in cheetahs because long-term concurrent measurements of body temperature and activity never have been reported for cheetahs, or indeed for any free-living felid. We report here body temperature and locomotor activity measured with implanted data loggers over seven months in five free-living cheetahs in Namibia. Air temperature ranged from a maximum of 39ºC in summer to -2ºC in winter. Cheetahs had higher (∼0.4 ºC) maximum 24h body temperatures, later acrophase (∼1 h), with larger fluctuations in the range of the 24h body temperature rhythm (∼0.4 ºC) during a hot-dry period than during a cool-dry period, but maintained homeothermy irrespective of the climatic conditions. As ambient temperatures increased, the cheetahs shifted from a diurnal to a crepuscular activity pattern, with reduced activity between 9:00 and 15:00 and increased nocturnal activity. The timing of hunts followed the general pattern of activity; the cheetahs hunted when they were on the move. Cheetahs hunted if an opportunity presented itself, on occasion they hunted in the midday heat or in total darkness (new moon). Biologging revealed insights into cheetah biology that are not accessible by traditional observer-based techniques. This article is protected by copyright. All rights reserved.

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“…In addition, these rectal temperatures were measured in captive animals that were prevented from thermoregulating behaviourally (Finch, 1972;Fuller et al, 1999;Mitchell et al, 2002). Subsequent studies on free-living eland showed a much smaller 24 h amplitude of the rhythm of body core temperature (Bligh & Harthoorn, 1965;Harthoorn et al, 1970;Finch, 1972;Finch & Robertshaw, 1979;Fuller et al, 1999Fuller et al, , 2004Shrestha et al, 2012). Only the Thomson's gazelle (Gazella thomsonii; Taylor, 1970a) and red hartebeest (Alcelaphus buselaphus; Harthoorn et al, 1970) displayed an increased body (rectal) temperature amplitude with an associated lower body temperature in the morning (considered a hallmark of adaptive heterothermy) when they were deprived of water, and these animals were captive.…”

Section: When Is Heterothermy 'Adaptive Heterothermy'?mentioning

confidence: 99%

Heterothermy in large mammals: inevitable or implemented?

et al. 2014

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Advances in biologging techniques over the past 20 years have allowed for the remote and continuous measurement of body temperatures in free-living mammals. While there is an abundance of literature on heterothermy in small mammals, fewer studies have investigated the daily variability of body core temperature in larger mammals. Here we review measures of heterothermy and the factors that influence heterothermy in large mammals in their natural habitats, focussing on large mammalian herbivores. The mean 24 h body core temperatures for 17 species of large mammalian herbivores (>10 kg) decreased by ∼1.3°C for each 10-fold increase in body mass, a relationship that remained significant following phylogenetic correction. The degree of heterothermy, as measured by the 24 h amplitude of body core temperature rhythm, was independent of body mass and appeared to be driven primarily by energy and water limitations. When faced with the competing demands of osmoregulation, energy acquisition and water or energy use for thermoregulation, large mammalian herbivores appear to relax the precision of thermoregulation thereby conserving body water and energy. Such relaxation may entail a cost in that an animal moves closer to its thermal limits for performance. Maintaining homeostasis requires trade-offs between regulated systems, and homeothermy apparently is not accorded the highest priority; large mammals are able to maintain optimal homeothermy only if they are well nourished, hydrated, and not compromised energetically. We propose that the amplitude of the 24 h rhythm of body core temperature provides a useful index of any compromise experienced by a free-living large mammal and may predict the performance and fitness of an animal.

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Body temperature variation of South African antelopes in two climatically contrasting environments

Cited by 14 publications

References 63 publications

Vaginal implant transmitters for continuous body temperature measurement in moose

Vaginal implant transmitters for continuous body temperature measurement in moose

Body temperature, activity patterns and hunting in free‐living cheetah: biologging reveals new insights

Heterothermy in large mammals: inevitable or implemented?

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