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The hydrogeomorphological e•ects of beaver dam-building activity

School of Geography, University of Birmingham, Birmingham B15 2TT, UK

A characteristic of beaver ecology is their ability to build dams and, thus, to modify the landscape to increase its suitability for their occupation. This ability gives beaver great significance as a geomorphic agent. In order to review the hydrogeomorphological effects of beaver dam-building activity, this article places a context on the likely distribution and magnitude of beaver activity by considering the spatial and temporal variability of distributions of beaver and the habitat characteristics which might favour the establishment of substantial beaver populations. A description is then given of the nature and potential dimensions of instream structures built by beaver and the environmental conditions under which dam building has been observed to occur. The hydrogeomorphological impact of dam building is then appraised both locally and at the landscape scale, illustrating the very significant process modification caused by beaver. While the European beaver, Castor fiber, is the main focus of this review, it necessarily draws extensively on the much larger literature concerning the North American beaver (Castor canadensis).

Key Words: Castor fiber • Castor canadensis • beaver dams • beaver meadows • beaver ponds • riparian hydrology • river channel change • sediment storage

Progress in Physical Geography, Vol. 22, No. 2, 167-189 (1998)
DOI: 10.1177/030913339802200202


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