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5 - Connectivity at the land–water interface

Published online by Cambridge University Press:  24 May 2010

Kevin R. Crooks
Affiliation:
Colorado State University
M. Sanjayan
Affiliation:
The Nature Conservancy, Virginia
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Summary

INTRODUCTION

There is a growing appreciation in ecology and conservation that even those habitats and ecosystems (we will use these terms interchangeably) traditionally considered “insular” are in fact reticulately connected (Polis and Strong 1996). These connections are mediated by both physical and biological processes spanning a wide range of spatial and temporal scales (Polis and Strong 1996). This is clearly true of linkages between similar habitat types, such as fragmented systems, or patchily distributed communities (e.g., see Moilanen and Hanski Chapter 3; DiBacco et al. Chapter 8). However, linkages are also critically important between very distinct habitats, such as forests and grasslands, freshwater and marine habitats, or aquatic and terrestrial ecosystems. In fact, as we will discuss in this chapter, if connected habitats are dissimilar we believe there is at least as much potential for movement of materials to influence the connected systems as when habitats are similar.

Inter-habitat connectivity has been formally recognized at least since 1923 (Summerhayes and Elton 1923), but recognition of the importance of linking systems for altering their productivity goes back much further (e.g., to ancient irrigation schemes, such as those in the Nile Delta of Egypt). Recently, an integration of the landscape and ecosystem ecology concepts of connectivity, and their potential to structure ecosystems, has begun to be examined in detail (e.g., Polis and Hurd 1996).

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