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Science 5 December 1997:
Vol. 278. no. 5344, p. 1685
DOI: 10.1126/science.278.5344.1685e
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Why do large grazing animals prefer particular patches of grasslands? Observations made by McNaughton et al. (p. 1798) in the Serengeti National Park support a "positive feedback loop" in which grazing accelerates nutrient availability. The rate of nitrogen mineralization was enhanced, and levels of sodium in the soil increased in grazed areas. The increased sodium availability more likely benefits the grazers than the plants.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)