Energetics and Thermoregulation in Chiroptera

Davydov, Alexander

doi:10.1023/b:joey.0000042626.18724.9d

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…Researchers have assumed that these periods of arousal are necessary for bats to eliminate accumulated metabolites, urine, escape from predators or to adjust to changes in the temperature of their hibernacula (e.g. Prendergast et al 2002, Humphries et al 2003, Davydov 2004). Other activities undertaken during these arousals include drinking and copulation (McCracken & Wilkinson 2000, Kokurewicz 2004, Boyles et al 2006).…”

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Keeping bats cool in the winter: hibernating bats and their exposure to ‘hot’ incandescent lamplight

Haarsma

Hullu²

2012

Wildlife Biology

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In order to monitor bat population trends, an annual census is performed of all known underground hibernacula in Europe. During these censuses, bats are sometimes found to show signs of arousal, presumably from non-tactile stimuli caused by the observer, e.g. air currents, sound, light or an increase in temperature. We assume that heat and/or light from a torch can play a role in awaking hibernating bats. Observers use different light sources, which produce different amounts of heat. We experimentally tested the heat produced by three commonly used torches: two incandescent torches (krypton and halogen) and one LED torch. We performed the experiment on 28 January 2007 in an old brick kiln in Windesheim (Overijssel Province, the Netherlands), which is used by hibernating bats. The results show that temperatures in a crevice significantly increased when using the 'hot' incandescent torch types. The effect of these torches on both air and surface temperature was significant after both 10 and 30 seconds. Under the assumption that an increase of the ambient temperature by 58C or more can cause a bat to arouse from torpor, we conclude that using 'hot' torches such as incandescent (halogen) lights poses a risk to the animals under study. To minimise heat disturbance from light sources, we recommend LED torches as the best available alternative.

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confidence: 99%

Keeping bats cool in the winter: hibernating bats and their exposure to ‘hot’ incandescent lamplight

Haarsma

Hullu²

2012

Wildlife Biology

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“…The wing membranes of bats present a large surface area over which radiation might be absorbed, increasing heat load to the animal. This, combined with the heat energy produced during flight makes bats particularly susceptible to overheating [39], [40], [41], which can be fatal in experimental conditions between 38–39°C [42]. Furthermore, observations of captive bats have noted their aversion to even a moderate infra-red heat source [37].…”

Section: Discussionmentioning

confidence: 99%

Bats Avoid Radar Installations: Could Electromagnetic Fields Deter Bats from Colliding with Wind Turbines?

Nicholls

Racey

2007

PLoS ONE

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Large numbers of bats are killed by collisions with wind turbines, and there is at present no direct method of reducing or preventing this mortality. We therefore determine whether the electromagnetic radiation associated with radar installations can elicit an aversive behavioural response in foraging bats. Four civil air traffic control (ATC) radar stations, three military ATC radars and three weather radars were selected, each surrounded by heterogeneous habitat. Three sampling points matched for habitat type and structure, dominant vegetation species, altitude and surrounding land class were located at increasing distances from each station. A portable electromagnetic field meter measured the field strength of the radar at three distances from the source: in close proximity (<200 m) with a high electromagnetic field (EMF) strength >2 volts/metre, an intermediate point within line of sight of the radar (200–400 m) and with an EMF strength <2 v/m, and a control site out of sight of the radar (>400 m) and registering an EMF of zero v/m. At each radar station bat activity was recorded three times with three independent sampling points monitored on each occasion, resulting in a total of 90 samples, 30 of which were obtained within each field strength category. At these sampling points, bat activity was recorded using an automatic bat recording station, operated from sunset to sunrise. Bat activity was significantly reduced in habitats exposed to an EMF strength of greater than 2 v/m when compared to matched sites registering EMF levels of zero. The reduction in bat activity was not significantly different at lower levels of EMF strength within 400 m of the radar. We predict that the reduction in bat activity within habitats exposed to electromagnetic radiation may be a result of thermal induction and an increased risk of hyperthermia.

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“…This state can last from several hours to several months (Hoffman, 1964;Nelson, 1980;Lyman et al, 1982;Wang, 1987;French, 1988;Storey and Storey, 1990;Geiser and Ruf, 1995). In particular, the bats can decrease their body temperature almost to the ambient one (McNab, 1982) or in a short time increase it significantly above this value (even up to 40°C at the air temperature of only a few degrees) (Davydow, 2004).…”

Section: Introductionmentioning

confidence: 99%

Physical parameters beneficial for grouping of western barbastelle bats into clusters during hibernation

Kłys

Ziembik

Makuchowska-Fryc

2022

Preprint

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Abstract. Social hibernation of animals is one of the most important physiological and ecological behaviours. The purpose of the study was the investigation of the influence of the roostsite climate parameters: temperature (T), humidity (Rh) and air flow velocity (v) on the clustering of the Barbastella barbastellus (western barbastelle) during hibernation. The research was carried out in the underground systems of Poland (Central Europe) over a period of 6 years. The range of air parameters changes ranged for T from 6.0 to 12.4 °C, for Rh from 56.4 to 91.8 % and for v from 0.01 to 1.17 m/s. The quantile linear regression method was used for the statistical analysis of the results. The study indicated that the increase in the number of individuals in the hibernaculum occurs with an increase in the product (correlation result) T and v, while a decrease in the size of the group occurs with an increase in the products T and Rh, v and Rh as well as T, v and Rh.

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Energetics and Thermoregulation in Chiroptera

Cited by 3 publications

References 24 publications

Keeping bats cool in the winter: hibernating bats and their exposure to ‘hot’ incandescent lamplight

Keeping bats cool in the winter: hibernating bats and their exposure to ‘hot’ incandescent lamplight

Bats Avoid Radar Installations: Could Electromagnetic Fields Deter Bats from Colliding with Wind Turbines?

Physical parameters beneficial for grouping of western barbastelle bats into clusters during hibernation

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