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Related Concept Videos

Body Temperature01:25

Body Temperature

5.2K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
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Body Temperature01:07

Body Temperature

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Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
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Production Efficiency01:01

Production Efficiency

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Mechanism of heat transfer01:19

Mechanism of heat transfer

2.1K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Thermoregulation01:26

Thermoregulation

2.9K
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Do ectotherms partition thermal resources? We still do not know.

James E Paterson1, Gabriel Blouin-Demers2

  • 1Department of Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada. james.earle.paterson@gmail.com.

Oecologia
|November 17, 2016
PubMed
Summary

Evidence for thermal niche partitioning enabling ectotherm coexistence is limited. More research is needed to confirm if behavioral thermoregulation and differing thermal performance curves allow similar species to live together.

Keywords:
Character displacementInterspecific competitionNiche partitioningThermal physiology

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Physiology

Background:

  • Species coexistence is often explained by niche partitioning.
  • Ectotherms' variable body temperatures affect performance and fitness.
  • Behavioral thermoregulation is crucial for ectotherms to maintain optimal body temperatures.

Purpose of the Study:

  • To review existing studies on thermal resource partitioning.
  • To evaluate the evidence supporting thermal niche partitioning as a mechanism for ectotherm coexistence.
  • To identify future research directions for testing this hypothesis.

Main Methods:

  • Literature review of studies on thermal resource partitioning in ectotherms.
  • Analysis of evidence for thermal niche partitioning facilitating species coexistence.
  • Assessment of thermal traits and their evolutionary conservatism.

Main Results:

  • Most reviewed studies lacked sufficient evidence to unequivocally support thermal niche partitioning as a driver of coexistence.
  • Differences in thermal traits between coexisting species may be due to factors other than interspecific competition.
  • Thermal performance curves and preferred temperatures can evolve under strong selection.

Conclusions:

  • The hypothesis that thermal niche partitioning drives ectotherm coexistence requires more rigorous testing.
  • Future studies should compare sympatric and allopatric populations to isolate competition effects.
  • While potential for selection on thermal traits exists, widespread evidence for this mechanism in nature is currently lacking.