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Allee Effects in Ecology and Conservation$
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Franck Courchamp, Ludek Berec, and Joanna Gascoigne

Print publication date: 2008

Print ISBN-13: 9780198570301

Published to Oxford Scholarship Online: May 2008

DOI: 10.1093/acprof:oso/9780198570301.001.0001

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Mechanisms for Allee effects

Mechanisms for Allee effects

(p.18) 2. Mechanisms for Allee effects
Allee Effects in Ecology and Conservation

Franck Courchamp

Luděk Berec

Joanna Gascoigne

Oxford University Press

This chapter describes the mechanisms by which an Allee effect can arise. For each mechanism, the chapter discusses how it works in theory, and then presents current evidence for, and examples of, the mechanisms in practice. It begins with reproductive mechanisms, including fertilization efficiency in broadcast spawners, pollen limitation, mate finding, sperm limitation, reproductive facilitation by conspecifics, and female choice. It then moves on to mechanisms related to survival: environmental conditioning and particularly predation, both via the dilution effect and via group ‘behaviour’, such as flocking, coloniality, and group vigilence. Finally, the chapter discusses Allee effects in social and cooperative species, where group size is important for both reproduction and survival.

Keywords:   population density, population size, reproduction, survival, density dependence, cooperation, social, dilution effect

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