2011
DOI: 10.1016/j.jtherbio.2011.07.012
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Energy advantages of orientation to solar radiation in three African ruminants

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Cited by 23 publications
(19 citation statements)
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“…Recently, Hetem et al (2011) analyzed factors determining body orientation in three species of African ruminants -blue wildebeest (Connochaetus taurinus), eland (Tragelaphus oryx) and impala (Aepyceros melampus). Despite a rather limited data set, the study brought clear evidence for thermo-alignment in all three species -they oriented perpendicular to incident solar radiation during austral winter and parallel to incident solar radiation during austral summer.…”
Section: Thermo-alignment In Blue Wildebeest Eland and Impalamentioning
confidence: 99%
“…Recently, Hetem et al (2011) analyzed factors determining body orientation in three species of African ruminants -blue wildebeest (Connochaetus taurinus), eland (Tragelaphus oryx) and impala (Aepyceros melampus). Despite a rather limited data set, the study brought clear evidence for thermo-alignment in all three species -they oriented perpendicular to incident solar radiation during austral winter and parallel to incident solar radiation during austral summer.…”
Section: Thermo-alignment In Blue Wildebeest Eland and Impalamentioning
confidence: 99%
“…However, this orientation behavior decreases when there is a reliable source of water available (Maloney et al, 2005). Other African species, such as the eland, blue wildebeest, and impala also use preferential body orientations, positioning their bodies parallel to the sun in summer and perpendicular in winter (Figure 4) (Hetem et al, 2011). Once again, energetic demands drive these behaviors relative to the amount of direct solar radiation.…”
Section: Behavioralmentioning
confidence: 99%
“…Understanding how different species use thermoregulatory behaviors, such as orientation to solar radiation, to buffer changes in the thermal environment could help identify species vulnerable to climate change (Fuller, Mitchell, Maloney, & Hetem, ). Typically, behavioral thermoregulatory responses of mammals have been studied through visual observations by human observers (Alvarez, Guevara, Reyes, Sanchez, & Galindo, ; Fuller et al, ; Hetem et al, ; Lease et al, ; Treydte, Van der Beek, Perdok, & Van Wieren, ), a labour‐intensive and arduous process, and potentially biased in its outcome, because it is not possible to watch all individuals, or even index individuals, all the time. Moreover, the presence of a human observer may disrupt not just normal animal behavior (Jack et al, ; Klailova, Hodgkinson, & Lee, ; McDougall, ) but also autonomic function (Fuller et al, ).…”
Section: Introductionmentioning
confidence: 99%
“…Blue wildebeest are more dependent on shade, whereas black wildebeest prefer open habitats with little to no shade available (Skinner & Chimimba, ). Both black (Lease et al, ; Maloney et al, ; Vrahimis & Kok, ) and blue wildebeest (Berry, Siegfried, & Crowe, ; Hetem et al, ) have been found to rely on orientation to solar radiation for thermoregulatory purposes. Both wildebeest typically orientate perpendicular to the sun early in the morning and late afternoon, especially in winter when ambient temperatures are cool, but in summer, and in the heat of the day, they orientate parallel to the sun (Berry et al, ; Hetem et al, ; Lease et al, ; Maloney et al, ; Vrahimis & Kok, ).…”
Section: Introductionmentioning
confidence: 99%
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