Understanding the Law of Tolerance in Organisms
Explore the concept of the law of tolerance, developed by Victor Ernest Shelford in 1913, which explains how organisms' success is influenced by environmental factors. Learn about the optimum zone, zone of stress, and zones of intolerance in relation to this law.
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Presentation Transcript
Law of Tolerance Law of Tolerance by Subhamita Das
Introduction The law of tolerance was developed in 1913 by American zoologist Victor Ernest Shelford. It states that an organism s success is based on a complex set of condition and that each organism has a certain minimum, maximum and optimum environmental factor or combination of factors that determine success. As population is exposed to the extremes of a particular limiting factors, the rates of survival begin to drop.
Organisation The distribution of a species in response to a limiting factor can be represented as a bell-shaped curve with three distinct regions 1. Optimum zone: Central portion of curve which has conditions that favour maximal reproductive success and survivability. 2. Zone of stress: Regions flanking the optimal zone, where organisms can survive but with reduced reproductive success. 3. Zones of intolerance: Outermost region in which organisms cannot survive (represents extremes of the limiting factor).
