Aug

28

often the markets move to a constellation where the expected move is different despite the similarity of the independent variables. Bacon called it ever changing cycles. the silviculturists call it a reaction norm:

A ‘reaction norm’ describes the sensitivity of an organism, or of a set of organisms of the same genotype (e.g., the members of a clone), to some specific environmental variable. It quantifies phenotypic change (or lack of change) in a selected aspect of the phenotype as a function of variation in the environmental factor of interest.

A book of interest on this and other topics:

Geographic Variation in Forest Trees: Genetic Basis and Application of Knowledge in Silviculture

Geographic Variation in Forest Trees is the first book to examine this subject from a world-wide perspective. The author discusses population genetic theory and genetic systems of native North American tree species as they interact with environments in the major climatic regions in the world. He then demonstrates how this knowledge is used to guide seed zoning and seed transfer in silviculture, basing much of his discussion on models developed in Scandinavia and North America. In the final chapter, the author addresses the issue of genetic conservation — a subject of great concern in the face of accelerated forest destruction, industrial pollution, and climatic change. This comprehensive, well-researched book makes a significant contribution to the knowledge of one of our most important renewable natural resources.

More background: Phenotypic plasticity

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