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<br />VII. DESERT fiSHES
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<br />435
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<br />INCREASING OISTANCE rROM HEAOWATERS ..
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<br />Fig, 6, Linear dispersion of fishes in streams of various parts of the world, and
<br />sketches of body forms of representative species found in various segments of
<br />streams' or stream systems. Note that factors oth,er than stream gradient, such
<br />as sizes, turbidity, or water chemistry, were correlated with these distributions by
<br />some authors, and that this figure oversimplifies some patterns originally described.
<br />
<br />Chubs of the genus Gila are most impressive, ranging from the thick-
<br />bodied G. intermedia that lives in smaller, quieter habitats of the Gila
<br />River basin, through G. robusta of intermediate-sized rivers and moderate
<br />currents, to the exccedingly specialized G. elegans and G. cypha of the
<br />mainstream Colorado River (Miller, 1946b; Cole, 1968; Rinne and
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