Heterothermy in free-ranging male Egyptian Free-tailed bats (Tadarida aegyptiaca) in a subtropical climate

Toussaint, Dawn Cory; McKechnie, Andrew E.; Merwe, M. van der

doi:10.1016/j.mambio.2009.06.001

Cited by 33 publications

(24 citation statements)

References 16 publications

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“…Low metabolism in tropical bats resolution of heart rate measurements (Maloney et al, 1999). Fluctuations in heart rate, such as those found in the present study, might be part of the normal 'torpor' pattern, but may not have been described in the literature because measurements of torpor and metabolic rates are based on oxygen consumption and changes in body temperature (Cory Toussaint et al, 2010;Stawski et al, 2009). Smaller fluctuations in temperature have a much larger effect on tropical than on temperate species, at least in heterotherms, because they are adapted to more narrow temperature ranges in their environment (Dillon et al, 2010).…”

Section: Discussionmentioning

confidence: 60%

“…(Audet and Thomas, 1996;Turbill et al, 2003). In our study we were expecting to find high DEE values because as a tropical species, living near the equator at relatively consistent high ambient temperatures, M. molossus should be limited in its ability to use torpor, unlike bats from regions with stronger seasonal and daily temperature fluctuations (Bonaccorso et al, 1992;Cory Toussaint et al, 2010;Speakman and Thomas, 2003).…”

Section: Discussionmentioning

confidence: 81%

“…Chruszcz and Barclay, 2002;Cryan and Wolf, 2003;Hamilton and Barclay, 1994;Kurta, 1991;Kurta et al, 1990;Lausen and Barclay, 2003), but subtropical or even tropical bats are also known to use torpor and even hibernate (e.g. Bartels et al, 1998;Cory Toussaint et al, 2010;Geiser and Brigham, 2000;Hosken and Withers, 1997;Kelm and von Helversen, 2007). However, field data on the thermal biology of tropical bats are scarce, even though torpor is thought to have evolved in the tropics (McNab, 1969).…”

Section: Introductionmentioning

confidence: 99%

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Low metabolism in a tropical bat from lowland Panama measured using heart rate telemetry: an unexpected life in the slow lane

Dechmann

Ehret

Gaub

et al. 2011

Journal of Experimental Biology

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SUMMARYAnimals must optimize their daily energy budgets, particularly if energy expenditures are as high as they are in flying animals. However, energy budgets of free-ranging tropical animals are poorly known. Newly miniaturized heart rate transmitters enabled this to be addressed this in the small, energetically limited, neotropical bat Molossus molossus. High-resolution 48 h energy budgets showed that this species significantly lowers its metabolism on a daily basis, even though ambient temperatures remain high. Mean roosting heart rate was 144 beats min -1 , much lower than expected for a 10 g bat. Low roosting heart rates combined with short nightly foraging times (37 min night

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Low metabolism in a tropical bat from lowland Panama measured using heart rate telemetry: an unexpected life in the slow lane

Dechmann

Ehret

Gaub

et al. 2011

Journal of Experimental Biology

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“…However, in contrast to rodents (e.g. LandryCuerrier et al, 2008;Michener, 1992;Munro et al, 2005), only a handful of studies of thermoregulation during hibernation exist for free-ranging bats and many of these are for tropical or sub-tropical species (Cory Toussaint et al, 2010;Liu and Karasov, 2010;Stawski et al, 2009;Turbill, 2006;Turbill and Geiser, 2008). Very few studies have reported long-term body temperature profiles of temperate-zone bats in winter (Hope and Jones, 2012;Park et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Hibernation energetics of free-ranging little brown bats

Jonasson

Willis

2012

Journal of Experimental Biology

101

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SUMMARYHibernation physiology and energy expenditure have been relatively well studied in large captive hibernators, especially rodents, but data from smaller, free-ranging hibernators are sparse. We examined variation in the hibernation patterns of free-ranging little brown bats (Myotis lucifugus) using temperature-sensitive radio-transmitters. First, we aimed to test the hypothesis that age, sex and body condition affect expression of torpor and energy expenditure during hibernation. Second, we examined skin temperature to assess whether qualitative differences in the thermal properties of the hibernacula of bats, compared with the burrows of hibernating rodents, might lead to different patterns of torpor and arousal for bats. We also evaluated the impact of carrying transmitters on body condition to help determine the potential impact of telemetry studies. We observed large variation in the duration of torpor bouts within and between individuals but detected no effect of age, sex or body condition on torpor expression or estimates of energy expenditure. We observed the use of shallow torpor in the midst of periodic arousals, which may represent a unique adaptation of bats for conservation of energy during the most costly phase of hibernation. There was no difference in the body condition of hibernating bats outfitted with transmitters compared with that of control bats captured from the same hibernaculum at the same time. This study provides new information on the energetics of hibernation in an underrepresented taxon and baseline data important for understanding how white-nose syndrome, a new disease devastating populations of hibernating bats in North America, may alter the expression of hibernation in affected bats. Supplementary material available online at

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“…In temperate latitudes with long, cold winters, many non-migratory bats hibernate for much of the year, usually in thermally stable hibernacula such as caves (Park et al, 2000;Ransome, 1990). Several tropical and subtropical species are also known to hibernate and/or use daily torpor under natural conditions in winter, and in some cases summer (Coburn et al, 1996;Cory Toussaint et al, 2010;Dechmann et al, 2011;Liu et al, 2011;Stawski et al, 2010;Turbill et al, 2003).…”

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confidence: 99%

Thermoregulation in free-ranging Nycteris thebaica (Nycteridae) during winter: No evidence of torpor

2013

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Bats are among the most heterothermic mammals, with nearly all species investigated under free-ranging conditions to date exhibiting some degree of daily torpor and/or hibernation. We investigated thermoregulation during late winter by seven Nycteris thebaica in a warm, semi-arid habitat in northern South Africa, using temperaturesensitive transmitters to measure skin temperature (T skin ). Unexpectedly, we found no evidence for any expression of daily torpor or hibernation based on a total of 86 days of data from 7 bats (one male and six females), despite air temperatures as low as ~ 10 ºC. Instead, daytime T skin was distributed unimodally with most values in the 33 -

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Heterothermy in free-ranging male Egyptian Free-tailed bats (Tadarida aegyptiaca) in a subtropical climate

Cited by 33 publications

References 16 publications

Low metabolism in a tropical bat from lowland Panama measured using heart rate telemetry: an unexpected life in the slow lane

Low metabolism in a tropical bat from lowland Panama measured using heart rate telemetry: an unexpected life in the slow lane

Hibernation energetics of free-ranging little brown bats

Thermoregulation in free-ranging Nycteris thebaica (Nycteridae) during winter: No evidence of torpor

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