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LA FONDATION EN FAVEUR DE LA SOCIÉTÉ ET DE L'ENVIRONNEMENT

Since 1995

Laws :  1  2  3-4  5  6  7  8  9  10  11-12  13  14  15-19  15-19cont'd  20  21  22  23  24  25  26  27 

environment

 
 

3. LAW OF TOLERANCE 

A species is confined, ecologically and geographically, by the extremes of 
environmental adversities that it can withstand. 

The boundaries of a species realm --
Hill, valley, sea, dry land --
Are drawn when hardships overwhelm
Its power to withstand


4. LAW OF VALENCE 

In each part of its area, a given species shows a greater or lesser amplitude 
in ranging through various habitats (or communities); this is conditioned by 
its requirements and tolerances being satisfied or nearly overcome.
Where best its needs are met, a species grows,
But hindered or deprived, its ouput slows.