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Avian InvasionsThe Ecology and Evolution of Exotic Birds$
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Tim M. Blackburn, Julie L. Lockwood, and Phillip Cassey

Print publication date: 2009

Print ISBN-13: 9780199232543

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780199232543.001.0001

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The Role of Contingency in Establishment Success

The Role of Contingency in Establishment Success

Chapter:
(p.51) 3 The Role of Contingency in Establishment Success
Source:
Avian Invasions
Author(s):

Tim M. Blackburn

Julie L. Lockwood

Phillip Cassey

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199232543.003.0003

Establishment is the stage that has been the focus of most invasion studies in birds. However, the research on this topic has not always been congruent in its findings, and considerable disagreement exists over the causes of successful establishment. One point on which most writers agree is that the numbers of individuals contributing to an introduction event (i.e., propagule pressure) is an important contributory factor. This chapter presents reasons why this would be expected, which relate to the problems of survival that face small populations of any organism. Evidence for a relationship between propagule pressure and establishment success is assessed. The chapter concludes by considering some of the other associations of propagule pressure, especially those which may affect the conclusions of studies of establishment that do not account for it.

Keywords:   propagule pressure, propagule size, propagule number, small-population paradigm, stochasticity, Allee effects

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