Thermoregulation in endotherms: physiological principles and ecological consequences

Enrico L. Rezende, Leonardo D. Bacigalupe

Resultado de la investigación: Review article

15 Citas (Scopus)

Resumen

In a seminal study published nearly 70 years ago, Scholander et al. (BiolBull 99:259–271, 1950) employed Newton’s law of cooling to describe how metabolic rates (MR) in birds and mammals vary predictably with ambient temperature (Ta). Here, we explore the theoretical consequences of Newton’s law of cooling and show that a thermoregulatory polygon provides an intuitively simple and yet useful description of thermoregulatory responses in endothermic organisms. This polygon encapsulates the region in which heat production and dissipation are in equilibrium and, therefore, the range of conditions in which thermoregulation is possible. Whereas the typical U-shaped curve describes the relationship between Ta and MR at rest, thermoregulatory polygons expand this framework to incorporate the impact of activity, other behaviors and environmental conditions on thermoregulation and energy balance. We discuss how this framework can be employed to study the limits to effective thermoregulation and their ecological repercussions, allometric effects and residual variation in MR and thermal insulation, and how thermoregulatory requirements might constrain locomotor or reproductive performance (as proposed, for instance, by the heat dissipation limit theory). In many systems the limited empirical knowledge on how organismal traits may respond to environmental changes prevents physiological ecology from becoming a fully developed predictive science. In endotherms, however, we contend that the lack of theoretical developments that translate current physiological understanding into formal mechanistic models remains the main impediment to study the ecological and evolutionary repercussions of thermoregulation. In spite of the inherent limitations of Newton’s law of cooling as an oversimplified description of the mechanics of heat transfer, we argue that understanding how systems that obey this approximation work can be enlightening on conceptual grounds and relevant as an analytical and predictive tool to study ecological phenomena. As such, the proposed approach may constitute a powerful tool to study the impact of thermoregulatory constraints on variables related to fitness, such as survival and reproductive output, and help elucidating how species will be affected by ongoing climate change.

Idioma originalEnglish
Páginas (desde-hasta)709-727
Número de páginas19
PublicaciónJournal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
Volumen185
N.º7
DOI
EstadoPublished - 22 oct 2015

Huella dactilar

thermoregulation
Body Temperature Regulation
environmental impact
polygon
Cooling
cooling
Hot Temperature
dissipation
reproductive performance
Mammals
Thermal insulation
Birds
ecological phenomena
Ecology
Energy balance
Heat losses
heat
Climate change
Temperature
heat production

ASJC Scopus subject areas

  • Physiology
  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry
  • Animal Science and Zoology
  • Endocrinology

Citar esto

@article{4a1b2a620cb743b38e3acc3b0b436924,
title = "Thermoregulation in endotherms: physiological principles and ecological consequences",
abstract = "In a seminal study published nearly 70 years ago, Scholander et al. (BiolBull 99:259–271, 1950) employed Newton’s law of cooling to describe how metabolic rates (MR) in birds and mammals vary predictably with ambient temperature (Ta). Here, we explore the theoretical consequences of Newton’s law of cooling and show that a thermoregulatory polygon provides an intuitively simple and yet useful description of thermoregulatory responses in endothermic organisms. This polygon encapsulates the region in which heat production and dissipation are in equilibrium and, therefore, the range of conditions in which thermoregulation is possible. Whereas the typical U-shaped curve describes the relationship between Ta and MR at rest, thermoregulatory polygons expand this framework to incorporate the impact of activity, other behaviors and environmental conditions on thermoregulation and energy balance. We discuss how this framework can be employed to study the limits to effective thermoregulation and their ecological repercussions, allometric effects and residual variation in MR and thermal insulation, and how thermoregulatory requirements might constrain locomotor or reproductive performance (as proposed, for instance, by the heat dissipation limit theory). In many systems the limited empirical knowledge on how organismal traits may respond to environmental changes prevents physiological ecology from becoming a fully developed predictive science. In endotherms, however, we contend that the lack of theoretical developments that translate current physiological understanding into formal mechanistic models remains the main impediment to study the ecological and evolutionary repercussions of thermoregulation. In spite of the inherent limitations of Newton’s law of cooling as an oversimplified description of the mechanics of heat transfer, we argue that understanding how systems that obey this approximation work can be enlightening on conceptual grounds and relevant as an analytical and predictive tool to study ecological phenomena. As such, the proposed approach may constitute a powerful tool to study the impact of thermoregulatory constraints on variables related to fitness, such as survival and reproductive output, and help elucidating how species will be affected by ongoing climate change.",
keywords = "Animal energetics, Bergmann’s rule, Geographic distribution, Macrophysiology, Metabolic rate, Thermal conductance, Thermal insulation",
author = "Rezende, {Enrico L.} and Bacigalupe, {Leonardo D.}",
year = "2015",
month = "10",
day = "22",
doi = "10.1007/s00360-015-0909-5",
language = "English",
volume = "185",
pages = "709--727",
journal = "Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology",
issn = "0174-1578",
publisher = "Springer Verlag",
number = "7",

}

Thermoregulation in endotherms : physiological principles and ecological consequences. / Rezende, Enrico L.; Bacigalupe, Leonardo D.

En: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, Vol. 185, N.º 7, 22.10.2015, p. 709-727.

Resultado de la investigación: Review article

TY - JOUR

T1 - Thermoregulation in endotherms

T2 - physiological principles and ecological consequences

AU - Rezende, Enrico L.

AU - Bacigalupe, Leonardo D.

PY - 2015/10/22

Y1 - 2015/10/22

N2 - In a seminal study published nearly 70 years ago, Scholander et al. (BiolBull 99:259–271, 1950) employed Newton’s law of cooling to describe how metabolic rates (MR) in birds and mammals vary predictably with ambient temperature (Ta). Here, we explore the theoretical consequences of Newton’s law of cooling and show that a thermoregulatory polygon provides an intuitively simple and yet useful description of thermoregulatory responses in endothermic organisms. This polygon encapsulates the region in which heat production and dissipation are in equilibrium and, therefore, the range of conditions in which thermoregulation is possible. Whereas the typical U-shaped curve describes the relationship between Ta and MR at rest, thermoregulatory polygons expand this framework to incorporate the impact of activity, other behaviors and environmental conditions on thermoregulation and energy balance. We discuss how this framework can be employed to study the limits to effective thermoregulation and their ecological repercussions, allometric effects and residual variation in MR and thermal insulation, and how thermoregulatory requirements might constrain locomotor or reproductive performance (as proposed, for instance, by the heat dissipation limit theory). In many systems the limited empirical knowledge on how organismal traits may respond to environmental changes prevents physiological ecology from becoming a fully developed predictive science. In endotherms, however, we contend that the lack of theoretical developments that translate current physiological understanding into formal mechanistic models remains the main impediment to study the ecological and evolutionary repercussions of thermoregulation. In spite of the inherent limitations of Newton’s law of cooling as an oversimplified description of the mechanics of heat transfer, we argue that understanding how systems that obey this approximation work can be enlightening on conceptual grounds and relevant as an analytical and predictive tool to study ecological phenomena. As such, the proposed approach may constitute a powerful tool to study the impact of thermoregulatory constraints on variables related to fitness, such as survival and reproductive output, and help elucidating how species will be affected by ongoing climate change.

AB - In a seminal study published nearly 70 years ago, Scholander et al. (BiolBull 99:259–271, 1950) employed Newton’s law of cooling to describe how metabolic rates (MR) in birds and mammals vary predictably with ambient temperature (Ta). Here, we explore the theoretical consequences of Newton’s law of cooling and show that a thermoregulatory polygon provides an intuitively simple and yet useful description of thermoregulatory responses in endothermic organisms. This polygon encapsulates the region in which heat production and dissipation are in equilibrium and, therefore, the range of conditions in which thermoregulation is possible. Whereas the typical U-shaped curve describes the relationship between Ta and MR at rest, thermoregulatory polygons expand this framework to incorporate the impact of activity, other behaviors and environmental conditions on thermoregulation and energy balance. We discuss how this framework can be employed to study the limits to effective thermoregulation and their ecological repercussions, allometric effects and residual variation in MR and thermal insulation, and how thermoregulatory requirements might constrain locomotor or reproductive performance (as proposed, for instance, by the heat dissipation limit theory). In many systems the limited empirical knowledge on how organismal traits may respond to environmental changes prevents physiological ecology from becoming a fully developed predictive science. In endotherms, however, we contend that the lack of theoretical developments that translate current physiological understanding into formal mechanistic models remains the main impediment to study the ecological and evolutionary repercussions of thermoregulation. In spite of the inherent limitations of Newton’s law of cooling as an oversimplified description of the mechanics of heat transfer, we argue that understanding how systems that obey this approximation work can be enlightening on conceptual grounds and relevant as an analytical and predictive tool to study ecological phenomena. As such, the proposed approach may constitute a powerful tool to study the impact of thermoregulatory constraints on variables related to fitness, such as survival and reproductive output, and help elucidating how species will be affected by ongoing climate change.

KW - Animal energetics

KW - Bergmann’s rule

KW - Geographic distribution

KW - Macrophysiology

KW - Metabolic rate

KW - Thermal conductance

KW - Thermal insulation

UR - http://www.scopus.com/inward/record.url?scp=84941992428&partnerID=8YFLogxK

U2 - 10.1007/s00360-015-0909-5

DO - 10.1007/s00360-015-0909-5

M3 - Review article

C2 - 26025431

AN - SCOPUS:84941992428

VL - 185

SP - 709

EP - 727

JO - Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology

JF - Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology

SN - 0174-1578

IS - 7

ER -