Telemetric field studies of body temperature and activity rhythms of Acomys russatus and A. cahirinus in the Judean Desert of Israel

Oecologia ◽  
1999 ◽  
Vol 119 (4) ◽  
pp. 484-492 ◽  
Author(s):  
R. Elvert ◽  
N. Kronfeld ◽  
T. Dayan ◽  
A. Haim ◽  
N. Zisapel ◽  
...  
Keyword(s):  
Body Temperature ◽  
Field Studies ◽  
Activity Rhythms

Some like it cool? Intermorph comparison of preferred body temperature in a colour-dimorphic snake

2009 ◽  
Vol 59 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Koji Tanaka
Keyword(s):  
Body Temperature ◽  
Environmental Factors ◽  
Laboratory Experiment ◽  
Predation Risk ◽  
Field Studies ◽  
Behavioural Thermoregulation ◽  
Model Species ◽  
High Predation ◽  
Preferred Body Temperature ◽  
Recent Laboratory

AbstractOrganismal characteristics of ectotherms are profoundly affected by body temperature (Tb). Despite constraints imposed by environmental factors, they can adjust Tb by several means. However, if thermoregulatory ability is limited by their own property such as coloration and this constraint affects individual's fitness, selection may promote coevolution of coloration and thermal aspects. I investigated this topic using a colour-dimorphic (melanistic/striped) snake Elaphe quadrivirgata as a model species. Recent laboratory experiment revealed slower body warming in striped individuals than in melanistic individuals. Under this circumstance, one way that striped individuals can manage their slower body warming is to prefer low Tb. Contrary to this prediction, there was no intermorph difference in preferred Tb. Coupled with the results of field studies, I suggest that striped individuals manage their slower body warming by behavioural thermoregulation and that constraints (e.g., high predation risk due to conspicuousness under thermally superior habitats) imposed on melanistic individuals lessen their thermal advantages. The effect of melanism on thermal aspects may not be so advantageous for melanistic animals than generally thought.

A songbird adjusts its heart rate and body temperature in response to season and fluctuating daily conditions

2021 ◽  
Vol 376 (1830) ◽  
pp. 20200213 ◽  
Author(s):  
Nils Linek ◽  
Tamara Volkmer ◽  
J. Ryan Shipley ◽  
Cornelia W. Twining ◽  
Daniel Zúñiga ◽  
...  
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Environmental Conditions ◽  
Field Studies ◽  
Weather Extremes ◽  
Ambient Temperatures ◽  
In The Wild ◽  
Radio Transmitters ◽  
Save Energy ◽  
Free Ranging

In a seasonal world, organisms are continuously adjusting physiological processes relative to local environmental conditions. Owing to their limited heat and fat storage capacities, small animals, such as songbirds, must rapidly modulate their metabolism in response to weather extremes and changing seasons to ensure survival. As a consequence of previous technical limitations, most of our existing knowledge about how animals respond to changing environmental conditions comes from laboratory studies or field studies over short temporal scales. Here, we expanded beyond previous studies by outfitting 71 free-ranging Eurasian blackbirds ( Turdus merula ) with novel heart rate and body temperature loggers coupled with radio transmitters, and followed individuals in the wild from autumn to spring. Across seasons, blackbirds thermoconformed at night, i.e. their body temperature decreased with decreasing ambient temperature, but not so during daytime. By contrast, during all seasons blackbirds increased their heart rate when ambient temperatures became colder. However, the temperature setpoint at which heart rate was increased differed between seasons and between day and night. In our study, blackbirds showed an overall seasonal reduction in mean heart rate of 108 beats min −1 (21%) as well as a 1.2°C decrease in nighttime body temperature. Episodes of hypometabolism during cold periods likely allow the birds to save energy and, thus, help offset the increased energetic costs during the winter when also confronted with lower resource availability. Our data highlight that, similar to larger non-hibernating mammals and birds, small passerine birds such as Eurasian blackbirds not only adjust their heart rate and body temperature on daily timescales, but also exhibit pronounced seasonal changes in both that are modulated by local environmental conditions such as temperature. This article is part of the theme issue ‘Measuring physiology in free-living animals (Part I)’.

scholarly journals Drosophila Temperature Preference Rhythms: An Innovative Model to Understand Body Temperature Rhythms

2019 ◽  
Vol 20 (8) ◽  
pp. 1988 ◽  
Author(s):  
Tadahiro Goda ◽  
Fumika N. Hamada
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
The Body ◽  
Metabolic Energy ◽  
Temperature Preference ◽  
Preferred Temperature ◽  
Activity Rhythms ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Human Body Temperature

Human body temperature increases during wakefulness and decreases during sleep. The body temperature rhythm (BTR) is a robust output of the circadian clock and is fundamental for maintaining homeostasis, such as generating metabolic energy and sleep, as well as entraining peripheral clocks in mammals. However, the mechanisms that regulate BTR are largely unknown. Drosophila are ectotherms, and their body temperatures are close to ambient temperature; therefore, flies select a preferred environmental temperature to set their body temperature. We identified a novel circadian output, the temperature preference rhythm (TPR), in which the preferred temperature in flies increases during the day and decreases at night. TPR, thereby, produces a daily BTR. We found that fly TPR shares many features with mammalian BTR. We demonstrated that diuretic hormone 31 receptor (DH31R) mediates Drosophila TPR and that the closest mouse homolog of DH31R, calcitonin receptor (Calcr), is essential for mice BTR. Importantly, both TPR and BTR are regulated in a distinct manner from locomotor activity rhythms, and neither DH31R nor Calcr regulates locomotor activity rhythms. Our findings suggest that DH31R/Calcr is an ancient and specific mediator of BTR. Thus, understanding fly TPR will provide fundamental insights into the molecular and neural mechanisms that control BTR in mammals.

Reply — Studies of beaver activity and body temperature: a historical perspective

1994 ◽  
Vol 72 (3) ◽  
pp. 572-574 ◽  
Author(s):  
Douglas W. Smith ◽  
Thomas D. Drummer ◽  
Rolf O. Peterson
Keyword(s):  
Body Temperature ◽  
Social Organization ◽  
Seasonal Changes ◽  
Historical Perspective ◽  
Castor Canadensis ◽  
Food Hoarding ◽  
Activity Rhythms ◽  
Hoarding Behavior

Bovet claims that Smith et al. (D.W. Smith, R.O. Peterson, T.D. Drummer, and D.S. Sheputis, 1991. Can. J. Zool. 69: 2178–2182) and Dyck and MacArthur (A.P. Dyck and R.A. MacArthur, 1992. Can. J. Zool. 70: 1668–1672) analyzed their data on activity and body temperature of beavers (Castor canadensis) incorrectly because they ignored the likelihood that northern beavers in winter have activity rhythms with periods >24 h. The analysis by Smith et al. was in fact appropriate for demonstrating seasonal changes in body temperature and its correlation with activity. These are important issues because researchers have obtained conflicting results and because seasonal changes in activity and body temperature have implications for colony energetics in the context of food-hoarding behavior and social organization.

CCK-8 and PGE1: central effects on circadian body temperature and activity rhythms in rats

2004 ◽  
Vol 81 (4) ◽  
pp. 615-621 ◽  
Author(s):  
Zoltán Szelényi ◽  
Zoltán Hummel ◽  
Miklós Székely ◽  
Erika Pétervári
Keyword(s):  
Body Temperature ◽  
Central Effects ◽  
Activity Rhythms

Ultradian and circadian body temperature and activity rhythms in chronic MPTP treated monkeys

2001 ◽  
Vol 31 (3) ◽  
pp. 161-170 ◽  
Author(s):  
H Almirall ◽  
V Bautista ◽  
A Sánchez-Bahillo ◽  
M Trinidad-Herrero
Keyword(s):  
Body Temperature ◽  
Activity Rhythms

scholarly journals Thermoregulation in the box turtles Terrapene carolina and Terrapene ornata

2002 ◽  
Vol 80 (5) ◽  
pp. 934-943 ◽  
Author(s):  
José Pedro Sousa do Amaral ◽  
Glenn Marvin ◽  
Victor H Hutchison
Keyword(s):  
Time Series ◽  
Body Temperature ◽  
Field Studies ◽  
Thermal Preference ◽  
Factorial Anova ◽  
Terrapene Carolina ◽  
Terrapene Ornata ◽  
Measured Activity ◽  
Box Turtles ◽  
Forested Areas

Terrapene ornata and Terrapene carolina are box turtles that live in different habitats, the former in grasslands and desert edges and the latter in forested areas. Considering these species' habitat selection, we predicted that T. ornata would select a higher body temperature (Tb) and would be a more precise thermoregulator than T. carolina. We recorded time series of cloacal Tb's in thigmothermal linear gradients from acclimatized (12 h light : 12 h dark; 10 or 20°C) box turtles. We used three analytical methods to evaluate and characterize turtles' activity: a ratio-dependent index that measured activity as an indirect function of changes in Tb, a comparison of hourly mean variances of Tb (ratio-independent), and autocorrelation. We tested the thermoregulatory differences between active T. carolina and T. ornata with a factorial ANOVA and characterized the turtles' thermoregulatory cycles with correlograms. Overall, T. ornata had significantly higher mean Tb's than T. carolina. The two species had similar diel thermoregulatory cycles with a period of approximately 24 h. No clear differences in absolute thermoregulatory precision of Tb's were detected. These species' thermal behaviours were consistent with those reported from field studies, suggesting that there are intrinsically determined differences in thermal preference that may help explain the different habitat choices.

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