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<br />.' <br /> <br />I: 6 % <br /> <br />/00 <br />o <br /> <br />f;o 0 <br />o <br />o <br />o <br /> <br /> <br />o <br /> <br />@ <br /> <br />o 0 <br />0000 <br />o <br />o 000 00 <br />@ -o~~ <br /> <br />DO 00 00-1 <br /> <br />o <br /> <br />~ 0 I <br /> <br />[{]o 0000 <br />o 0 0 / <br />o _0/-............ <br />~. 0 -.. """ <br />~ -. .~ <br />@ @. !,~ <br />@ @seminudo @ . · .. · <br />@. . . ..~ . . <br />· . robusto.~ <br /> <br />e/egons <br /> <br />D 9% <br /> <br />cypho <br /> <br />o <br /> <br />o <br /> <br />o <br /> <br />o 0 <br />oQ;] <br />o <br />o 0 <br />00 <br />000 <br /> <br />o <br />om <br />o <br />o <br /> <br />o <br />@ <br /> <br />@ <br /> <br />o <br />0_ <br /> <br />o <br /> <br />-- <br />o <br />...... <br />..... <br /> <br /> <br /> <br />. <br /> <br />FIGURE 2. Principal components analysis, components I and II, of four forms of <br />Gila. G. robusta robusta, G. elegans, and G. Cypha are discriminated by the <br />combination of projections shown in Figure 2 and 3. G. r. seminuda is scat- <br />tered through the other clusters. Percentages indicate the proportion of the <br />total variation accounted for by each component. <br /> <br />TABLE 1. Development of nuchal hump in Colorado <br />River chubs, Genus Gila.a <br /> <br />Species <br /> <br />Ratio (range) <br /> <br />S.L.range (nun) <br /> <br />cypha (31) <br />elegans (20) <br />r. robusta (17) <br />r. seminuda (4) <br /> <br />6-13 <br />15-29 <br />28-207 <br />31-121 <br /> <br />206-328 <br />245-412 <br />211-309 <br />175-247 <br /> <br />aExpressed as ratio: P <br />1-P2 distance <br /> <br />Depth frontal depression <br />Figures in parentheses indicate number of speci- <br />mens measured. <br /> <br />615 <br /> <br />II <br />