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<br /> <br />Sheldon <br /> <br />r2LARK~FORK <br /> <br />38 <br />YELLOWSTONE <br /> <br />Figure 1. Native freshwater fishes of selected river systems. <br /> <br />age area is a result of several processes. Total area of <br />stream surface increases with drainage area, yielding <br />concomitant increases in numbers of individuals and <br />species (Preston 1962). Furthermore, the fusion of <br />small, low-order (Strahler 1957) streams with increas- <br />ing drainage area forms larger streams, which provide <br /> <br /> <br />. '. <br />. . . @ <br />. ... (ff> <br />. @ <br /> <br />@ <br /> <br />@ <br /> <br />.- <br />Figure 2. Distribution of federally listed endangered <br />fishes. Taxa restricted to a single state (e) are dis- <br />tinguished from those in two or more states (0). <br /> <br />Conservation of Slre2m Fishes 1 S 1 <br /> <br />WHITE <br /> <br />~ <br /> <br />ROANOKE 87 <br /> <br />TE~NESSEE <br />224 <br /> <br />~ S!;'')NNAH <br />yr <br />S1. JOHNS <br />55 <br /> <br />MISSISSIPPI <br />'" 300 <br /> <br />additional habitats. Predictable changes in habitat, com- <br />position, and diversity of the fish fauna with increasing <br />stream order are well documented (Thompson & Hunt <br />1930; Kuehne 1962; Sheldon 1968; Horwitz 1978). Spe- <br />ciation rates may be greater in larger drainages if isola- <br />tion by distance and intervening high order streams reo <br />duce gene flow among populations of small-stream <br /> <br /> <br />.@ <br /> <br /> <br />~ <br /> <br />THREATENED <br />Figure 3. Distribution of federally listed threatened <br />fishes. Symbols as in Figure 2. <br /> <br />Conservation Biology <br />Volume 2, No. 2, June 1988 <br />