The Ecology of Invasions by Animals and Plants

The Ecology of Invasions by Animals and Plants

The Ecology of Invasions by Animals and Plants

The Ecology of Invasions by Animals and Plants

Excerpt

In this book I have tried to bring together ideas from three different streams of thought with which I have been closely concerned during the last thirty years or so. The first is faunal history, usually regarded as a purely academic subject, but to some of whose events can be traced number of the serious dislocations taking place in the world today. The second is ecology, particularly the structure and dynamics of populations. The third is conservation. I first published a few ideas about the significance of invasions in 1943, in a war-time review called Polish Science and Learning, under the title of 'The changing realms of animal life'. Since then I have had the opportunity to think pretty hard about conservation, while taking part in the planning and development of the Nature Conservancy. In March 1957 I gave three broadcasts in the B.B.C.'s Third Programme, under the title of 'Balance and Barrier. These were subsequently printed in The Listener (1957, Vol. 57, pp. 514-15, 556-7, 596-7, and 600). The present book is essentially an expansion of these. I am extremely grateful to Mr James C. Thornton and Dr John Simons for advice and help in planning and giving these talks.

In preparing this book I have had invaluable assistance from the staff of the Bureau of Animal Population. Miss C. M. Gibbs typed the fair copy. Miss M. Nicholls has given me much advice on bibliographical matters. And Mr Denys Kempson has employed his superlative skill at photography in copying and printing the lot illustrations. Without his help particularly I could not have made the book in its present form.

For permission to reproduce illustrations I am very grateful to a number of people and institutions, who are individually acknowledged in the legends under them. I want to thank Mrs M. J. Thornton and Mr J. S. Watson very much for allowing me the use of original photographs. The following have given invaluable help in getting me the use of other unpublished photographs: Dr Paul DeBach, Citrus Experiment . . .

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