Small mammals in a landscape mosaic: implications for conservation

doi:10.1017/CBO9780511615757.017

16 - Small mammals in a landscape mosaic: implications for conservation

Published online by Cambridge University Press: 15 December 2009

Karl J. Martin and

William C. McComb

Edited by

Cynthia J. Zabel and

Robert G. Anthony

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Karl J. Martin: Affiliation:
Bureau of Integrated Science Services, Wisconsin Department of Natural Resources, Rhinelander, Wisconsin 54501, USA
William C. McComb: Affiliation:
Department of Natural Resources Conservation, University of Massachusetts, Amherst, Massachusetts 01003, USA
Cynthia J. Zabel: Affiliation:
Pacific Southwest Research Station
Robert G. Anthony: Affiliation:
Oregon State University

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Summary

Introduction

Johnson (1980) provided a conceptual framework to describe habitat selection that identified four scales of selection: geographic range, home range, resource patches within home ranges, and specific resources necessary for survival (Fig. 16.1). The spatial scales over which these patterns of selection occur vary widely among species of mammals found in northwest coniferous forests. Harris (1984) estimated home range sizes for mammals in the Pacific Northwest and indicated they have a home range size distribution described by a negative exponential function (Fig. 16.2). Natural disturbance regimes common in Pacific Northwest coniferous forests (Spies and Turner 1999; Fig. 16.3) result in a distribution of patch sizes remarkably similar to this home range size distribution with frequent disturbances (sun flecks, small gaps, herbivores, and pathogens) creating small patches, and infrequent disturbances (fire, wind) creating larger patches. Indeed, inherent scales of disturbance in northwest coniferous forests under natural conditions likely represent the range of conditions and landscape mosaics that match evolved life histories of mammal species throughout the region. However, the effects of alterations in the spatial and temporal variability, pattern, and composition of the landscape caused by recent human disturbances, particularly timber harvest, raise questions regarding the continued persistence of diverse mammalian communities in managed forests (Lawlor 2003).

Landscapes are defined as the heterogeneous land area composed of an interacting mosaic of patches, at any scale, relevant to the phenomenon (e.g., species) under consideration (McGarigal and Marks 1995, McGarigal and McComb 1995).

Type: Chapter
Information: Mammal Community Dynamics
Management and Conservation in the Coniferous Forests of Western North America
, pp. 567 - 586

DOI: https://doi.org/10.1017/CBO9780511615757.017 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2003

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