Shasta ground sloth food habits, Rampart Cave, Arizona | Paleobiology | Cambridge Core (original) (raw)
Abstract
The feces of the Shasta ground sloth (Nothrotheriops shastense), preserved by the arid climate of the lower Grand Canyon, were collected at various levels and examined by microhistological analyses to identify and quantify plant taxa in the diet. Over 500 pieces of different Shasta sloth coprolites were examined. Sloth dung from the nearby Muav Caves was examined and compared with that from Rampart Cave.
Seventy-two genera of plants were identified in the sloth dung deposited discontinuously from over 40,000 to about 11,000 yr BP. The major plant taxa in the Rampart Cave sloth diets were desert globemallow (Sphaeralcea ambigua = 52%), Nevada mormontea (Ephedra nevadensis = 18%), saltbushes (Atriplex spp. = 7%), catclaw acacia (Acacia greggii = 6%), Cactaceae spp. (= 3%), common reed (Phragmites communis = 5%), and yucca (Yucca spp. = 2%).
Six of the most abundant plants in sloth diets were collected in the environs of Rampart Cave and were analyzed for their energy, fiber and nutrient values. The simulated diets of Rampart Cave sloths averaged 1679 cal/g in digestible gross energy and 7.9% for digestible protein. Apart from a substantial increase in digestible energy and in mormontea there was no unusual change in the sloth diet immediately prior to the time of their extinction.
The ecological role of Nothrotheriops shastense is less dramatically different from that of extant desert herbivores than was previously believed.
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Copyright © The Paleontological Society
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References
Association of Official Agricultural Chemists (A.O.A.C.). 1970. Official Methods of Analysis. 11th ed.957 pp. Assoc. Off. Agric. Chem., Washington, D.C.Google Scholar
Anthony, R. G. and Smith, N. S. 1974. Comparison of rumen and fecal analysis to describe deer diets. J. Wildl. Manage. 38:535–540.CrossRefGoogle Scholar
Baldwin, G. C. 1946. Notes on Rampart Cave. The Masterkey. 20:94–96.Google Scholar
Beetle, A. A. 1970. Recommended Plant Names. 124 pp. Univ. Wyoming Agric. .Google Scholar
Clark, F. E., O'Deen, W. A. and Belau, B. E. 1974. Carbon, nitrogen and 15N content of fossil and modern dung from the lower Grand Canyon. J. Ariz. Acad. Sci. 9:95–96.Google Scholar
Dearden, B. L., Pegau, R. E., and Hansen, R. M. 1975. Precision of microhistological estimates of ruminant food habits. J. Wildl. Manage. 39:402–407.Google Scholar
Eames, A. J. 1930. Report on ground sloth coprolite from Doña Ana Co., New Mexico. Am. J. Sci. 20:353–356.Google Scholar
Goering, H. K. and Van Soest, P. J. 1970. Forage Fiber Analysis. U.S.D.A. Handbook No. 379:1–20. Washington, D.C. 20402.Google Scholar
Hansen, R. M. 1974. Dietary of the chuckwalla, Sauromalus obesus, determined by dung analysis. Herpetologica. 30:120–123.Google Scholar
Hansen, R. M. 1978. Late Pleistocene plant fragments in the dungs of herbivores, Cowboy Cave, Wayne County, Utah. .Google Scholar
Hansen, R. M., Johnson, M. K. and Van Devender, T. R. 1976. Foods of the desert tortoise, Gopherus agassizii, in Arizona and Utah. Herpetologica. 32:247–251.Google Scholar
Hansen, R. M. and Martin, P. S. 1973. Ungulate diets in the lower Grand Canyon. J. Range Manage. 26:380–381.CrossRefGoogle Scholar
Hansen, R. M., Peden, D. G., and Rice, R. W. 1973. Discerned fragments in feces indicates diet overlap. J. Range Manage. 26:103–105.Google Scholar
Harington, C. R. 1972. Extinct animals of Rampart Cave. Can. Geogr. J. 85:178–183.Google Scholar
Janis, C. 1976. The evolutionary strategy of the equidae and the origins of rumen and caecal digestion. Evolution. 30:757–774.Google Scholar
Johnson, M. K. and Hansen, R. M. 1977. Foods of coyotes in the lower Grand Canyon, Arizona. J. Ariz. Acad. Sci. 12:81–83.Google Scholar
Kearney, T. H. and Peebles, R. H. 1969. Arizona Flora. . 1085 pp. Univ. Calif. Press, Berkeley, California.Google Scholar
Laudermilk, J. D. and Munz, P. A. 1934. Plants in the dung of Nothrotherium from Gypsum Cave, Nevada. Carnegie Inst. Washington Publ. 453:31–37.Google Scholar
Laudermilk, J. D. and Munz, P. A. 1938. Plants in the dung of Nothrotherium from Rampart and Muav Caves, Arizona. Carnegie Inst. Washington Publ. 487:271–281.Google Scholar
Long, A., Hansen, R. M. and Martin, P. S. 1974. Extinction of the Shasta ground sloth. Bull. Geol. Soc. Am. 85:1943–1948.Google Scholar
Long, A. and Martin, P. S. 1974. Death of American ground sloth. Science. 186:638–640.Google Scholar
Lull, R. S. 1930. The ground sloth, Nothrotherium. Am. J. Sci. 20:344–352.Google Scholar
Martin, P. S. 1967. Prehistoric overkills. Pp. 75–120. In: Martin, P. S. and Wright, H. E. Jr., eds. Pleistocene Extinctions, the Search for a Cause. Yale Univ. Press; New Haven, Connecticut.Google Scholar
Martin, P. S. 1973. The discovery of America. Science. 179:969–974.Google Scholar
Martin, P. S. 1975. Sloth droppings. Nat. Hist., pp. 74–81.Google Scholar
Martin, P. S., Sabels, B. E. and Shutler, D. Jr. 1961. Rampart Cave coprolite and ecology of the Shasta ground sloth. Am. J. Sci. 259:102–107.Google Scholar
Mehringer, P. J. Jr. 1967. The environment of extinction of the late Pleistocene megafauna in the arid southwestern United States. Pp. 247–266. In: Martin, P. S. and Wright, H. E. Jr., eds. Pleistocene Extinctions, The search for a cause. Yale Univ. Press; New Haven, Connecticut.Google Scholar
National Academy of Sciences (NRC). 1975. Nutrient requirements of domestic animals. . 72 pp. 5th revised ed.Nat. Res. Counc., Washington, D.C.Google Scholar
Oosting, H. J. 1956. The study of plant communities. 2nd ed.440 pp. W. H. Freeman and Co.; San Francisco, California.Google Scholar
Phillips, A. M. III. 1975. Flora of the Rampart Cave area, lower Grand Canyon, Arizona. J. Ariz. Acad. Sci. 10:148–159.CrossRefGoogle Scholar
Phillips, A. M. III. 1977. Packrats, plants, and the Pleistocene in the lower Grand Canyon. 137 pp. . Dep. Gen. Biol., Univ. Ariz.; Tucson, Arizona.Google Scholar
Phillips, A. M. III and Van Devender, T. R. 1974. Pleistocene packrat middens from the lower Grand Canyon of Arizona. J. Ariz. Acad. Sci. 9:117–119.Google Scholar
Scotter, G. W. 1966. Sieve mesh size as related to volumetric analyses of caribou rumen contents. Can. Field-Nat. 80:238–241.Google Scholar
Shoop, M. C., Alford, E. J. and Mayland, H. F. 1977. Plains pricklypear is a good forage for cattle. J. Range Manage. 30:12–17.Google Scholar
Smith, D., Paulsen, G. M. and Raguse, C. A. 1964. Extraction of total available carbohydrates from grass and legume tissue. Plant Physiol. 39:960–962.Google Scholar
Snedecor, G. W. and Cochran, W. G. 1973. Statistical Methods. 593 pp. Iowa State Univ. Press; Ames, Iowa.Google Scholar
Sparks, D. R. and Malechek, J. C. 1968. Estimating percentage dry weight in diets using a microscope technique. J. Range Manage. 21:264–265.Google Scholar
Spaulding, G. W. and Martin, P. S. 1977. Ground sloth dung of the Guadalupe Mountains National Park, Texas. . Nat. Park Serv. Publ.Google Scholar
Stock, C. 1925. Cenozoic gravigrade edentates of Western North America. Carnegie Inst. Washington Publ. 331:1–206.Google Scholar
Storr, G. M. 1961. Microscopic analysis of faeces, a technique for ascertaining the diet of herbivorous mammals. Aust. J. Biol. Sci. 14:157–164.Google Scholar
Todd, J. W. and Hansen, R. M. 1973. Plant fragments in the feces of bighorns as indicators of food habits. J. Wildl. Manage. 37:363–366.Google Scholar
Trlica, M. J., Buwai, M., and Menke, J. W. 1977. Effects of rest following defoliations on the recovery of several range species. J. Range Manage. 30:21–27.Google Scholar
Van Dyne, G. M. 1962. Micro-methods for nutritive evaluation of range forages. J. Range Manage. 15:303–313.Google Scholar
Goering, H. K. and Van Soest, P. J. 1970. Forage Fiber Analyses (Apparatus, Reagents, Procedures, and Some Applications). 20 pp. USDA, .Google Scholar
Ward, A. L. 1970. Stomach content and fecal analysis: methods of forage identification. U.S. For. Serv. Rocky Mtn. For. and Range Exp. Stn. Misc. Publ. No. 1147:146–158. .Google Scholar
Wallace, A. and Romney, E. M. 1972. Radioecology and ecophysiology of desert plants at the Nevada test site. 439 pp. Nat. Tech. Inf. Serv., U.S. Dep. Commerce, Springfield, Virginia 22151.Google Scholar
Williams, O. B. 1969. An improved technique for identification of plant fragments in herbivore feces. J. Range Manage. 22:51–52.Google Scholar
Wilson, R. W. 1942. Preliminary study of the fauna of Rampart Cave, Arizona. Carnegie Inst. Washington Publ. 530:169–185.Google Scholar