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<br />. "'~rm <br /> <br />Figure 4. Principal component 3 plotted against principal component 2 for chubs <br />from Blackrocks, Colorado, on the mainstem Colorado River. "Roundtail" chubs <br />comprise a discrete cluster separated by a gap from the one for "humpback" and <br />"unidentified" chubs. "Unidentified" morphs may be "humpback" chubs preciously <br />excluded from the discriminant function equation used to define species at this <br />site. Note that the scores for a suspected "bony tail" morph (closed circle) <br />plot in or near those for "humpback" chubs R = "roundtail"; H = "humpback" ; <br />B = "unidentified" <br />