Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane

It has been proposed that there is a thermal cost of the mane to male lions, potentially leading to increased body surface temperatures (Ts), increased sperm abnormalities, and to lower food intake during hot summer months. To test whether a mane imposes thermal costs on males, we measured core body...

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Main Authors: Trethowan, P, Fuller, A, Haw, A, Hart, T, Markem, A, Loveridge, A, Hetem, R, du Preez, B, Macdonald, D
Format: Journal article
Published: Wiley 2017
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author Trethowan, P
Fuller, A
Haw, A
Hart, T
Markem, A
Loveridge, A
Hetem, R
du Preez, B
Macdonald, D
author_facet Trethowan, P
Fuller, A
Haw, A
Hart, T
Markem, A
Loveridge, A
Hetem, R
du Preez, B
Macdonald, D
author_sort Trethowan, P
collection OXFORD
description It has been proposed that there is a thermal cost of the mane to male lions, potentially leading to increased body surface temperatures (Ts), increased sperm abnormalities, and to lower food intake during hot summer months. To test whether a mane imposes thermal costs on males, we measured core body temperature (Tb) continuously for approximately one year in 18 free-living lions. There was no difference in the 24 h maximum Tb of males (n = 12) and females (n = 6), and males had a 24 h mean Tb that was 0.2 ± 0.1 °C lower than females after correcting for seasonal effects. Although feeding on a particular day increased 24 h mean and 24 h maximum Tb, this phenomenon was true of both male and female lions, and females had higher 24 h mean and 24 h maximum Tb than males, on both days when lions did not feed, and on days when lions did feed. Twenty four hour Tb was not influenced by mane length or colour, and 24 h mean Tb was negatively correlated with mane length. These data contradict the suggestion that there exists a thermal cost to male lions in possessing a long dark mane, but do not preclude the possibility that males compensate for a mane with increased heat loss. The increased insulation caused by a mane does not necessarily have to impair heat loss by males, which in hot environments is primarily through respiratory evaporative cooling, nor does in necessarily lead to increased heat gain, as lions are nocturnal and seek shade during the day. The mane may even act as a heat shield by increasing insulation. However, dominant male lions frequent water points more than twice as often as females, raising the possibility that male lions are increasing water uptake to facilitate increased evaporative cooling. The question of whether male lions with manes compensate for a thermal cost to the mane remains unresolved, but male lions with access to water do not have higher Tb than females or males with smaller manes.
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spelling oxford-uuid:56c86675-1b51-4eb6-842b-4b4cb4d3a0622022-03-26T16:52:39ZGetting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ maneJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:56c86675-1b51-4eb6-842b-4b4cb4d3a062Symplectic Elements at OxfordWiley2017Trethowan, PFuller, AHaw, AHart, TMarkem, ALoveridge, AHetem, Rdu Preez, BMacdonald, DIt has been proposed that there is a thermal cost of the mane to male lions, potentially leading to increased body surface temperatures (Ts), increased sperm abnormalities, and to lower food intake during hot summer months. To test whether a mane imposes thermal costs on males, we measured core body temperature (Tb) continuously for approximately one year in 18 free-living lions. There was no difference in the 24 h maximum Tb of males (n = 12) and females (n = 6), and males had a 24 h mean Tb that was 0.2 ± 0.1 °C lower than females after correcting for seasonal effects. Although feeding on a particular day increased 24 h mean and 24 h maximum Tb, this phenomenon was true of both male and female lions, and females had higher 24 h mean and 24 h maximum Tb than males, on both days when lions did not feed, and on days when lions did feed. Twenty four hour Tb was not influenced by mane length or colour, and 24 h mean Tb was negatively correlated with mane length. These data contradict the suggestion that there exists a thermal cost to male lions in possessing a long dark mane, but do not preclude the possibility that males compensate for a mane with increased heat loss. The increased insulation caused by a mane does not necessarily have to impair heat loss by males, which in hot environments is primarily through respiratory evaporative cooling, nor does in necessarily lead to increased heat gain, as lions are nocturnal and seek shade during the day. The mane may even act as a heat shield by increasing insulation. However, dominant male lions frequent water points more than twice as often as females, raising the possibility that male lions are increasing water uptake to facilitate increased evaporative cooling. The question of whether male lions with manes compensate for a thermal cost to the mane remains unresolved, but male lions with access to water do not have higher Tb than females or males with smaller manes.
spellingShingle Trethowan, P
Fuller, A
Haw, A
Hart, T
Markem, A
Loveridge, A
Hetem, R
du Preez, B
Macdonald, D
Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane
title Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane
title_full Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane
title_fullStr Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane
title_full_unstemmed Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane
title_short Getting to the core: internal body temperatures help reveal the ecological function and thermal implications of the lions’ mane
title_sort getting to the core internal body temperatures help reveal the ecological function and thermal implications of the lions mane
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