A form of non hereditary adaptation through which an individual compensates for a complex of environmental factors
Ecological Amplitude
The range of tolerance to environmental conditions and/or factors
Environmental stress
An external condition that causes a potentially injurious change in biological systems
Essential Resource
Materials that are required to support a group
Homeostasis
The relative constancy of internal body conditions.
Key resources Law of the Minimum
Essential resources that are expensive, rare, or simply difficult to acquire.
Law of Tolerance
The principle that, under steady-state conditions, growth, and development of an organism are dependent on all requisite needs being present in at least minimal amounts
Limiting factor
That environment component whose presence is beyound the limits of tolerance required for growth and development of an organims.
Phenotypic Plasticity
Observable biological changes that are induced by the environment.
Reaction norm
Observable changes in organism that vary as a function of environmental variation.