Between January and March burros spent from 60 to 78.7% of their time on the interfluves. In April, habitat use was predominantly in washes, with a high of 58.5% in July. During the summer months, when daily maximum ambient temperature approached 48°C, much of their time was spent in densely shaded pockets of vegetation along the Colorado River. Thirty-nine plant species comprised the diet in 1974, desert Indian-wheat (Plantago insularis) and palo verde (Cercidium floridum) being the most common. These two species, combined with mesquite (Prosopis spp.) and arrowweed (Pluchea sericea) formed over 50% of the annual diet. The 1974 diet consisted of 3.9% grasses, 30.1% forbes, and 61.1% browse. Population increases of 20-25% every 13-18 months and little predation bespeaks the need for unceasing management and possible control to prevent deterioration of the native flora and fauna. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.