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1 March 2018 Can Sheep Control Invasive Forbs Without Compromising Efforts to Restore Native Plants?
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Abstract

Domestic sheep (Ovis aries) are increasingly being used to control non-native invasive plants in areas where restoration is a management goal. However, the efficacy of sheep grazing depends on both its potential for controlling undesirable plants and its ability to promote natives. To date, few studies have investigated impacts of sheep grazing on native forb recovery in North American grasslands. We assessed the impact of sheep on forbs by measuring the number of stems grazed before and after sheep foraged in western Montana, United States. Sheep grazed a higher percentage of non-native than native forbs (70% vs. 23%, respectively), and number of stems grazed was six times higher for non-natives than natives (48 vs. 5, respectively). Sheep preferentially selected the non-native forbs sulphur cinquefoil and yellow salsify over leafy spurge (fi = 2.075; fi = 0.969; fi = 0.969, respectively), as well as the native forbs white prairie aster (fi = 1.090) and blanketflower (fi = 1.000). Selection of native forbs was positively correlated with their pregrazing abundance and increased over the grazing period. Our findings indicate that when using sheep to control invasive forbs, appropriate timing and monitoring of grazing are critical for reducing nontarget impacts to native vegetation.

Published by Elsevier Inc. on behalf of The Society for Range Management.
Eva Masin, Cara R. Nelson, and Morgan T. Valliant "Can Sheep Control Invasive Forbs Without Compromising Efforts to Restore Native Plants?," Rangeland Ecology and Management 71(2), 185-188, (1 March 2018). https://doi.org/10.1016/j.rama.2017.11.003
Received: 23 March 2016; Accepted: 1 November 2017; Published: 1 March 2018
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