The Tolerance Range of Animal to Gradient of Tmperature

Organisms have ranges of tolerance for environmental factors.The range will be the high and low extremes of tolerance for an environmental factor. Organisms have specific requirements for successful growth, development and reproduction.

Example: There may be a coldest temperature and hottest temperature an animal can survive in their environment.  That is their range of tolerance. 

Animal has optimum condition too. optimum condition is a condition that are most favorable for an organism to survive, grow and reproduce. This optimum is somewhere within the range of tolerance for that organism. If an animal has a range of tolerance for temperature of 0-85 degree F somewhere within that temperature range will be the temperature that the animal grows best. 

Tolerance range is also the range of something that a species can tolerate the abiotic environmental condition such as temperatures, pH, etc. and tolerance range differs from one species to another. If a species living in the area tolerance range is optimum, then the growth and development will be running maximum, but if the species live in the zone of stress either below or above the tolerance range, the metabolism of the body will be disrupted resulting in obstruct growth, if the species in intolerance range can cause death.