Ungulate Diets in the Lower Grand Canyon

Abstract

this study appear to warrant continued study into the effects of fertilizer on saltbush establishment. Field studies in which different rates and types of fertilizer are applied should provide more conclusive evidence as to the practicality of facilitating large scale saltbush establishment with fertilization. Literature Cited Anderson, B. L. 1972. Growth response and deer utilization of fertilized browse. MS Thesis, New Mexico State University. Cable, D. R. 1972. Fourwing saltbush revegetation trials in southern Arizona. J. Range Manage. 25: 150-153. Cook, C. W., L. A. Stoddart, and L. E. Harris. 1959. The chemical content in various portions of the current growth of saltdesert shrubs and grasses during winter. Ecology 40:644-651. Judd, B. 1. 1962. Principal forage plants of southwestern ranges. Rocky Mountain Forest and Range Exp. Sta., Forest Serv.,

Responses of Desert Bighorn Sheep to Removal of Water Sources

“…Browse represented the majority of diet during all seasons of our study and has been documented to be the primary forage class observed in diets in studies of desert bighorn sheep in Arizona (Seegmiller and Ohmart 1981, Miller and Gaud 1989, Etchberger and Krausman 1998, California (Oehler et al 2003), New Mexico (Sandoval 1979), Texas (Brewer 2001), and Sonora, Mexico (Tarango 2000). However, grasses were found in higher proportions seasonally in other studies in Arizona (Hansen and Martin 1973, Dodd and Brady 1988, Morgart 1990, Holt et al 1992) and dominated seasonal diets of bighorn sheep in Nevada (Barrett 1964, Brown et al 1977 and California (Bleich et al 1997). In the Virgin Mountains, Arizona, and Baja California Sur, Mexico, forbs dominated the diets of bighorn sheep (Sanchez 1976, Smith and and in Texas forbs and browse were equally important in bighorn sheep diets (Fulbright et al 2001).…”

Shasta Ground Sloth (Nothrotheriops shastense Hoffstetter) at Shelter Cave, New Mexico: Environment, Diet, and Extinction

“…In all cases the sloths browsed on xerophytic shrubs that are still locally available around these sites and in comparable modern woodland habitats. Comparisons with the diets of extant herbivores in the western Grand Canyon indicate that the sloth, primarily a browser, utilized grasses to a lesser extent than any living herbivore in the Southwest (Hansen and Martin, 1973). At the same time certain browse plants which, partly on the basis of pollen, Martin et al (1961) inferred to have been preferred items in the diet of Nothrotheriops shastense have not been found Laudermilk and Munz (1938).…”

The population and feeding ecology of tortoises and feral burros on Volcan Alcedo, Galapagos Islands /

“…Burros are opportunistic in their diets and will change from grazing to browsing depending on locality and food plant availability (Hansen and Martin, 1973;Woodward and Ohmart, 1976;Moehlman, 1979;Seegmiller and £ul They shiftea to a neater aepenaence on browse,…”

“…Competitive interactions cause action in the overall fitness of the populates nvol vea as a result of the aecreasea availahility of the Umitin, resources .PianKa, ,973,. Researchers have aemonstratea aietary a"a ecological overlap hetween f 1 burro s ana other native ana aomestic mammals .Hansen Martin, 1973, Seemlier ana Ohmart,198,).…”