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29 <br />LITERATURE CITED <br />Contreras -Balderas, S. 1978. Speciation aspects and man--made <br />community-,composition changes in Chihuahuan Desert fishes, pp. 405- <br />431. In: Symposium on the biological resources of the Chihuahuan <br />Desert Region. R.H Wauer and D.H. Riskind (eds.). U.S. National <br />Park Service. <br />Miller, R.R. 1976. Four new pupfishes of the genus Cyprinodon <br />from Mexico, with a key to the C. eximius complex. Bull. South. <br />California Acad. Sci. 75(2):68--75. <br />Miller, R.R., and V. Walters. 1972. A new genus of cyprinodontid <br />fish from Nuevo Leon, Mexico. Contrib. Sci. Nat. Hist. Mus. Los <br />Angeles Co. 233:1-13. <br />THE STATUS OF MEGUPSILON APORUS AND CYPRINODON ALVAREZI AT EL POTOSI, MEXICO <br />Michael L. Smith, University of Michigan Museum of Zoology. <br />The isolated pond and springs at E1 Potosf, Nuevo Leon, constitute the <br />only habitat of two unique pupf ish species, Megupsilon aporus and Cyprinodon <br />alvarezi, which are now threatened by the effects of groundwater pumping and <br />predation and competition by introduced black bass. The pupfishes have been <br />eliminated from parts of the main pond, but persist in a marginal marsh, <br />lateral springs and irrigation ditches. Though populations were adequate <br />in May, 1978, their restriction to peripheral habitats makes them susceptible <br />to lowered water levels and other results of human activity. The long-term <br />survival of the pupfishes will depend on careful management of their habitat.