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Long-term Changes in the Fish Community of Lower Sagehen Creek, <br />California 57 <br />Don C. Erman <br />Impact and Abundance of an Introduced Cichlid in the Lower Rio Grande <br />(Rio Bravo Del Norte), Texas and Mexico 59 <br />Robert J. Edwards <br />Michael G. Wood <br />Status of Leopard Frogs (Rana ipiens Complex: Ranidae) in Arizona and <br />Southeastern California: An Update 61 <br />Robert W. Clarkson <br />James C. Rorabaugh <br />San Bernardino National Wildlife Refuge, a Case Study of Acid Rain in the <br />Southwest 63 <br />William G. Kepner <br />Desert Fish Habitat Protection Through Federal Acquisition 65 <br />Gerald L. Burton <br />Observations on the Little Colorado River Population of the Humpback <br />Chub, during May 1987, 1988 67 <br />C.O. Minckley <br />Springsnails of the Death Valley System, CA-NV: Description and <br />Preliminary Zoogeographic Analysis 69 <br />Robert Hershler <br />Heterozygosity and Fitness Differences among Populations of the <br />Endangered Sonoran Topminnow (Poeciliopsis occidentalis) 71 <br />J.M. Quattro <br />R.C. Vrijenhoek <br />Status of Populations of Threespine Sticklebacks, Gasterosteus aculeatus, at <br />the Southernmost Portion of their Pacific Costal Range 73 <br />Thomas R. Haglund <br />Donald G. Buth <br />Sampling Theory, Genetic Characterization of Populations, and Loss of <br />Alleles in Populations of Low Effective Number 75 <br />W.J. Berg <br />A Recent Survey of Fishes from the Interior Rio Yaqui Drainage with a <br />Record of Flathead Catfish, Pylodictis olivaris, from the Rio Aros 77 <br />William C. Leibfried