Throughout the world natural forest ecosystems have been, and are being
massively disrupted or destroyed. The boreal forests of Canada are no
more immune to man's intervention than the tropical rain forests of
Africa, and the day is rapidly approaching when natural forest
ecosystems, undisturbed by man, will be found only as remnants in
national parks and other protected areas. Yet where they continue to
exist these ecosystems are an extraordinarily rich, though relatively
neglected source of data that illuminate many aspects of the classic
theory of evolution. The subject matter of this book is not, however,
confined to natural forest ecosystems. Forest ecosystems under varying
degrees of management, and man- made forests are also a rich source of
information on ecological genetics. In general, however, it can be said
that the published evidence of this fact has not yet significantly
penetrated the botanical literature. All too frequently it is confined
to what might be termed forestry journals. It is hoped that this book
will to some extent redress the balance, and draw attention to a body of
published work which not only provides a basis for the rational
management and conservation of forest ecosystems, but also complements
the literature of ecological genetics and evolution. The first draft of
Chapters I to V was written in German by the senior author and
translated by E. K. MORGENSTERN of the Canadian Forestry Service.