7258

• UCREFRP Catalog Number: 7258
• Author: Rosenfeld, M. J.
• Title: Morphometry in Chubs of the Genus
• USFW Year: 1986.
• Copyright Material: NO

chubs and a few individuals fell into the gap between the two

clusters for Blackrocks fish.

Green River collections sorted out as follows:

1. More variation was collectively seen in the combined

1935 Green River collections than in the one from Black-

rocks (Fig. 6; compare with Fig. 4).

2. Although plots of Green River collections overlapped,

there was a tendency for combined collection scores to be
. ~>'''rn

distributed within somewhat different regions defin2d by th2

PCA axes (Fig. 6).

3. Whirlpool Canyon speciMens exclusively plotted

into the same region as those for "roundtail" chubs from

Blackrocks, Colorado (Fig. 7).

4. Elsewhere, specimens mostly sorted into the "humpback-

intermediate" category from Blackrocks, Colorado (Fig. 6).

For example, the Coal Creek collection had specimens that

exclusively clustered as "humpback-intermediate" chubs (Fig.

8) .

6. The 1953 Horseshoe C3nyon specimens scored within a lower

extreme of variation for Green River and Colorado River

fishes, marGinally overlapping the Blackrocks "hump~ack-

intermediate" chub cluster (Fig. 9).

The only exceptions

were the 3 smallest specimens from Horseshoe Canyon, which

plotted near loadings for "roundtail" chubs. At least 3 of

the Horseshoe Canyon fish appeared to be "bony tail" :rorph3

9