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

To understand the adaptive capacity of a species in response to rapid habitat destruction and climate change, we investigated variation in body temperature (Tb) of three species of antelope, namely eland, blue wildebeest and impala, using abdominally-implanted temperature data loggers. The study was...

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Vydáno v:Journal of thermal biology Ročník 37; číslo 3; s. 171 - 178
Hlavní autoři: Shrestha, A.K., van Wieren, S.E., van Langevelde, F., Fuller, A., Hetem, R.S., Meyer, L.C.R., de Bie, S., Prins, H.H.T.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 01.04.2012
Témata:
Aepyceros melampus
Ambient temperature
Amplitudes
Body temperature
climate change
cold
conservation areas
drought
energy
food
habitat destruction
Habitats
Heterothermy
Impalas
Macro-physiology
malnutrition
national parks
national-park
Nutritional stress
oryx oryx-leucoryx
patterns
Physiological plasticity homeothermy
physiology
plant phenology
precipitation
rain
Rainfall
rattus-fuscipes
South Africa
spring
Springs (elastic)
Tragelaphus oryx
water economy
wildebeest
Winter
South Africa
Nutritional stress
Physiological plasticity homeothermy
Heterothermy
Body temperature
Macro-physiology
ISSN:0306-4565, 1879-0992
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Shrnutí:To understand the adaptive capacity of a species in response to rapid habitat destruction and climate change, we investigated variation in body temperature (Tb) of three species of antelope, namely eland, blue wildebeest and impala, using abdominally-implanted temperature data loggers. The study was conducted at two climatically contrasting environments in South Africa, one with a less seasonal and mild winter (Mapungubwe National Park) and the other with a more seasonal, long and cold winter (Asante Sana Game Reserve). Since the habitat with long and cold winters would be suboptimal for these African antelopes, which evolved in less seasonal and hot environments, antelopes in Asante Sana were expected to exhibit a larger amplitude in Tb and a lower minimum body temperature (MinTb) during winter to reduce Tb and the ambient temperature (Tb−Ta) gradient to save energy. In both eland and impala, 24-h body temperature amplitude did not differ between the study sites, regardless of season. Conversely, wildebeest in Mapungubwe showed a higher variability in the 24-h amplitude of body temperature and also a lower MinTb during winter and spring than the wildebeest in Asante Sana. This variation in Tb among Mapungubwe wildebeest was influenced by both the amplitude of ambient temperature (positive) and cumulative rainfall (negative), which was not the case for wildebeest in Asante Sana. We propose that the low MinTb of wildebeest in Mapungubwe was the result of nutritional stress during winter and spring; an evident response even during a year of average rainfall. Therefore, these wildebeest apparently live in a physiologically stressful environment. With the predicted increase in the frequency and intensity of drought periods in southern Africa, wildebeest and other grazers, will likely experience greater nutritional stress in the future.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0306-4565
1879-0992
DOI:10.1016/j.jtherbio.2011.12.008