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Related Concept Videos

Thermoregulation01:26

Thermoregulation

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.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used; instead...
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Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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Distribution and Dispersion00:54

Distribution and Dispersion

To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...

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Related Experiment Video

Updated: May 8, 2026

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

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Published on: March 9, 2021

Lizard thermal trait variation at multiple scales: a review.

Susana Clusella-Trullas1, Steven L Chown

  • 1Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Stellenbosch, 7602, South Africa, sct333@sun.ac.za.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
|August 31, 2013
PubMed
Summary

Understanding lizard thermal traits is key to predicting how environmental changes affect their diversity. This review synthesizes data on temperature limits, preferences, and active temperatures across space, time, and species.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Physiology

Background:

  • Thermal trait variation is crucial for predicting lizard responses to environmental change.
  • Understanding these traits helps forecast impacts on lizard diversity.

Purpose of the Study:

  • To review and synthesize literature on lizard thermal trait variation.
  • To examine patterns in sub-lethal temperature limits, temperature preference, and active body temperature.
  • To identify knowledge gaps in thermal trait responses across space, time, and phylogeny.

Main Methods:

  • Literature review of studies on lizard thermal traits.
  • Analysis of trait variation in relation to spatial (altitude, latitude) and temporal (daily, seasonal, acclimation) factors.
  • Inclusion of inter-specific analyses at regional and global scales.

Main Results:

  • Identified patterns of variation in upper and lower sub-lethal temperature limits, temperature preference, and active body temperature.
  • Highlighted the consistency and magnitude of thermal trait responses across different contexts.
  • Revealed several knowledge gaps regarding thermal trait relationships.

Conclusions:

  • Physiological information, including plasticity and evolutionary scope, is essential for forecasting lizard sensitivity to environmental change.
  • Synthesized data provides a foundation for future research on lizard adaptation to climate change.