scholarly journals Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs

2020 ◽  
Vol 11 ◽  
Author(s):  
Kathrin H. Dausmann ◽  
Danielle L. Levesque ◽  
Jens Wein ◽  
Julia Nowack
Keyword(s):  
Ambient Temperature ◽  
Daily Torpor ◽  
Temperature Cycles

scholarly journals Responding to the weather: energy budgeting by a small mammal in the wild

2019 ◽  
Vol 66 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Taylor Hume ◽  
Fritz Geiser ◽  
Shannon E Currie ◽  
Gerhard Körtner ◽  
Clare Stawski
Keyword(s):  
Body Temperature ◽  
Ambient Temperature ◽  
Small Mammals ◽  
Barometric Pressure ◽  
Breeding Period ◽  
Daily Torpor ◽  
Entire Study ◽  
Fat Reserves ◽  
In The Wild ◽  
Antechinus Stuartii

Abstract Energy conservation is paramount for small mammals because of their small size, large surface area to volume ratio, and the resultant high heat loss to the environment. To survive on limited food resources and to fuel their expensive metabolism during activity, many small mammals employ daily torpor to reduce energy expenditure during the rest phase. We hypothesized that a small terrestrial semelparous marsupial, the brown antechinus Antechinus stuartii, would maximize activity when foraging conditions were favorable to gain fat reserves before their intense breeding period, but would increase torpor use when conditions were poor to conserve these fat reserves. Female antechinus were trapped and implanted with small temperature-sensitive radio transmitters to record body temperature and to quantify torpor expression and activity patterns in the wild. Most antechinus used torpor at least once per day over the entire study period. Total daily torpor use increased and mean daily body temperature decreased significantly with a reduction in minimum ambient temperature. Interestingly, antechinus employed less torpor on days with more rain and decreasing barometric pressure. In contrast to torpor expression, activity was directly related to ambient temperature and inversely related to barometric pressure. Our results reveal that antechinus use a flexible combination of physiology and behavior that can be adjusted to manage their energy budget according to weather variables.

scholarly journals Temperature-dependent use of daily torpor attenuates the energetic consequences of habitat selection for a widespread bat

2021 ◽  
Author(s):  
Jesse M. Alston ◽  
Michael E. Dillon ◽  
Douglas A. Keinath ◽  
Ian M. Abernethy ◽  
Jacob R. Goheen
Keyword(s):  
Habitat Selection ◽  
Energy Expenditure ◽  
Ambient Temperature ◽  
Thermal Characteristics ◽  
List Type ◽  
Daily Torpor ◽  
Temperature Dependent ◽  
Roost Selection ◽  
The Relationship ◽  
Environmental Temperatures

SummaryMany animals employ heterothermy to conserve energy during periods of inactivity, stress, or low resource availability. Unlike homeotherms, these heterotherms have some flexibility in body temperature. Unlike poikilotherms, heterotherms can maintain body temperatures independently from their environments. Heterotherms should thus exhibit fundamentally different responses to suboptimal environmental temperatures than either homeotherms or poikilotherms.In a species of heterothermic bat (Myotis thysanodes), we studied how daily torpor and roost selection could mitigate the energetic consequences of variation in ambient temperature. We then (1) quantified the relationship between ambient temperature and torpor use, (2) simulated daily energy expenditure over a range of roost temperatures, and (3) quantified the influence of roost temperature on roost selection.Bats did not select roosts with specific thermal characteristics, nor did ambient temperature alter patterns of roost selection. This was likely because bats could modulate use of torpor to maintain a consistent level of energy expenditure over the course of a day, irrespective of ambient temperature.Thermoregulatory processes in heterotherms differ from that of homeotherms and poikilotherms, including through behaviours as universal as habitat selection. Unlike homeotherms, bats face little pressure to select warm habitats to avoid heat loss during periods of inactivity—bats can use daily torpor to fully offset any increases in energy expenditure from maintaining homeothermy at colder temperatures.

scholarly journals Behavior of an asphalt mixture MDC-19 under the cycles of ambient temperature in the city of Tunja, Colombia

Respuestas ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 56-64
Author(s):  
Carol Rosabeth Sanabria Sanabria ◽  
Carlos Hernando Higuera Sandoval
Keyword(s):  
Ambient Temperature ◽  
Environmental Temperature ◽  
Asphalt Mixture ◽  
Early Morning ◽  
Maximum Temperature ◽  
Temperature Cycles ◽  
Weather Factor ◽  
Asphalt Mix ◽  
And Performance ◽  
Definition Of

The weather factor plays an important role in the behavior and performance of asphalt mixtures as a surface layer in a flexible pavement structure, not just from the moisture, but also from the environmental temperature. Asphalt layers of the flexible pavements in Tunja city exposes daily to environmental temperature variations, which usually occur when the highest temperatures are reached during the daytime, and the lowest temperatures appear at night and early morning time. Firstly, this research is based , on the definition of the environmental temperature cycles that occur daily in Tunja City, from the analysis of the temperature series. Subsequently, the analysis was done through laboratory tests on an asphalt mix MDC-19 INVIAS type, made and compacted in the laboratory, to determine the influence of the cycles of environmental temperature on its density, stability and flow properties, during 120 daily and continuous temperature cycles, which consist of 12 hours of maximum temperature and 12 hours of minimum temperature to simulate the environmental conditions. As a result of this investigation, the presentation density is presented, presenting a tendency to increase the measurement that increases the temperature cycles and then a decrease in the briquettes of the mixture that have sometimes been until the last cycles. Variations in the resistance to deformation of the analysis mixture were obtained as the ambient temperature cycles were sometimes made, which concludes that the ambient temperature cycles have an influence on the behavior of the asphalt mixture.

scholarly journals Physiological Responses to Temperature by Whip-Poor-Wills: More Evidence for the Evolution of Low Metabolic Rates in Caprimulgiformes

The Condor ◽  
2004 ◽  
Vol 106 (4) ◽  
pp. 921-925
Author(s):  
Jeffrey E. Lane ◽  
David L. Swanson ◽  
R. Mark Brigham ◽  
Andrew E. McKechnie
Keyword(s):  
Metabolic Rate ◽  
Ambient Temperature ◽  
South Dakota ◽  
Basal Metabolic Rate ◽  
Ecological Niche ◽  
Physiological Responses ◽  
Metabolic Responses ◽  
Phylogenetic Position ◽  
Daily Torpor ◽  
Metabolic Rates

Abstract We measured the metabolic responses of nine Whip-poor-wills (Caprimulgus vociferus), captured in southeast South Dakota, to incremental changes in ambient temperature within the range of 0–40°C. Similar to other members of the Caprimulgiformes, Whip-poor-wills exhibited a basal metabolic rate that was lower than predicted by allometry. We compared basal metabolic rates of six caprimulgiform species (our data plus published values for five other species) with those of 82 other avian species using both conventional and phylogenetically independent ANCOVAs. The low basal metabolic rate of Caprimulgiformes was not explained by phylogenetic position. A low basal metabolic rate, together with the widespread ability of birds in this order to use daily torpor, seemingly has enabled members of this group to occupy their unique ecological niche (crepuscular insectivory). Respuestas Fisiológicas de Caprimulgus vociferus a la Temperatura: Más Evidencia a Favor de la Evolución de una Baja Tasa Metabólica en Caprimúlgidos Resumen. Medimos las respuestas metabólicas a aumentos de la temperatura ambiental en un rango de 0–40°C en nueve individuos de Caprimulgus vociferus capturados en Dakota del Sur. De manera similar a otros Caprimúlgidos, C. vociferus presentó una tasa metabólica basal menor a la predicha por parámetros alométricos. Comparamos las tasas metabólicas basales de seis especies de caprimúlgidos (nuestros datos más datos publicados para otras cinco especies) con aquellas de otras 82 especies de aves utilizando aná lisis de co-varianza (ANCOVA) convencionales y filogenéticamente independientes. La baja tasa metabó lica basal de los caprimúlgidos no fue explicada por su posición filogenética. La baja tasa metabólica basal, junto a la capacidad generalizada de las aves de este orden de usar torpor diario, aparentemente han permitido a los miembros de este grupo a ocupar un nicho ecológico único (insectivoría crepuscular).

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