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Impacts of Feral Livestock on Island Watersheds

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Title: Impacts of Feral Livestock on Island Watersheds
Authors: Van Vuren, Dirk H.
Johnson, Michael L.
Bowen, Lizabeth
Issue Date: Jul 2001
Publisher: University of Hawai'i Press
Citation: Van Vuren DH, Johnson ML, Bowen L. 2001. Impacts of feral livestock on island watersheds. Pac Sci 55(3): 285-289.
Abstract: We assessed the effects of overgrazing by feral sheep on watersheds
on Santa Cruz Island, California. Overgrazing had a marked effect on stream
flow; flows were much greater in overgrazed than in lightly grazed watersheds
early in the rainy season, but the difference vanished later in the season. This
pattern can be explained by reduced infiltration and increased surface runoff of
rainfall in overgrazed areas. Thus, feral livestock may affect island species not
only directly by grazing and trampling, but also indirectly by altering hydrologic
processes and therefore species that are dependent on these processes.
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 55, Number 3, 2001

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