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Related Concept Videos

Thermoregulation01:26

Thermoregulation

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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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A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Comparative thermal ecology of two lizards.

J C Lee1

  • 1Department of Biology, University of Miami, 33124, Coral Gables, Florida, USA.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Lizards in energetically costly habitats thermoregulate less precisely than those in low-cost habitats. Nutritional status also impacts lizard thermoregulation, with well-nourished lizards showing greater independence from environmental temperatures.

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Area of Science:

  • Ecology
  • Animal Behavior
  • Physiology

Background:

  • Thermoregulation is crucial for ectotherms like lizards.
  • Habitat characteristics, such as energetic costs, can influence thermoregulatory strategies.
  • Nutritional status may affect a lizard's ability to thermoregulate.

Purpose of the Study:

  • To investigate how energetic costs of thermoregulation influence lizard behavior.
  • To compare thermoregulatory precision between different habitat types.
  • To examine the role of nutritional status in lizard thermoregulation.

Main Methods:

  • Comparing mean body temperatures (MBT) and body temperature (Tb) on substrate temperature (Ts) regressions for Anolis sagrei and Anolis distichus in different habitats.
  • Assessing lizard nutritional status using length-specific fat body weights.
  • Observing perch site selection (sunny vs. shaded).

Main Results:

  • Anolis sagrei exhibited higher MBT and greater dependence on environmental temperatures in costly habitats compared to Anolis distichus.
  • In less costly habitats, Anolis sagrei showed higher MBT, occupied sunny perches more, and had a lower Tb-Ts regression slope.
  • Well-nourished lizards in costly habitats had Tb independent of environmental temperature, while poorly-nourished lizards were dependent; this was not observed in low-cost habitats.

Conclusions:

  • Energetic costs significantly influence the precision of thermoregulation in lizards.
  • Lizards in high-cost habitats thermoregulate less precisely than those in low-cost habitats.
  • Habitat exploitation strategy (perceived productivity) correlates with thermoregulatory precision.