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3 - Connectivity and metapopulation dynamics in highly fragmented landscapes

Published online by Cambridge University Press:  24 May 2010

By
Atte Moilanen  and
Ilkka Hanski
Edited by
Kevin R. Crooks  and
M. Sanjayan
Kevin R. Crooks
Affiliation:
Colorado State University
M. Sanjayan
Affiliation:
The Nature Conservancy, Virginia
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Summary

INTRODUCTION

Connectivity is a key variable in spatial ecology (MacArthur and Wilson 1967; Levin 1974; Hanski 1998; Tishendorf and Fahrig 2000; Moilanen and Hanski 2001; King and With 2002), and the element that turns a conventional population study (or a model) into a spatial one. Broadly speaking, connectivity measures the effect of landscape structure on movements of individuals, but in spite of the pivotal role of this measure in ecology, there is no generally accepted and employed formal definition of connectivity (Crooks and Sanjayan Chapter 1). In particular, the way connectivity is used in metapopulation ecology is different from its use in landscape ecology (Tishendorf and Fahrig 2000; Moilanen and Hanski 2001; With 2004; Taylor et al. Chapter 2). In metapopulation ecology, connectivity is seen as a property of a habitat patch (or a grid cell), and the measure of connectivity is defined via predicted rate of immigration into a patch or via predicted success of migrants leaving a patch.

In landscape ecology, connectivity is viewed as a property of an entire landscape – a measure of how much, or how little, landscape structure hinders movements (Taylor et al. 1993; With 2004; Taylor et al. Chapter 2). This difference in the spatial scale is reflected in the use of connectivity in modeling. Nonetheless, both metapopulation and landscape ecology are concerned with the same phenomena, the effects of landscape structure on migration, colonization success, and the persistence of species at the landscape level.

Type
Chapter
Information
Connectivity Conservation , pp. 44 - 71
Publisher: Cambridge University Press
Print publication year: 2006

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