7229

• UCREFRP Catalog Number: 7229
• Author: Kaeding, L. R. and M. A. Zimmerman
• Title: Life History and Ecology of the Humpback Chub in the Little Colorado and Colorado Rivers of the Grand Canyon
• USFW Year: 1983
• USFW - Doc Type: Transactions of the American Fisheries Society
• Copyright Material: NO

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Table 5. Sources of information and assumptions used in construction
of the suitability index graphs are listed. IIExcellentll habitat fo"r
the white sucker was assumed to correspond to an 51 of 0.8 to 1.0,
"good" habitat to an SI of 0.5 to 0.7, "fair" habitat to an SI of 0.2
to 0.4, and IIpcior" habitat to an SI of 0.0 to 0.1.

Variable

Assumptions and source

V1

Refer to the general riverine HSI turbidity variable
(V 1) .

V2

Refer to the general riverine HSI pH variable (V2).

V3

Refer to the general riverine HSI dissolved oxygen
variable (V3).

V4

Refer to the general riverine HSI temperature (adult,
juvenile) variable (V4).

Vs

Refer to the general riverine HSI temperature (fry)
variable (Vs).

V6

Refer to the general riverine HSI spawning temperature
(embryo) variable (V6).

V,

Refer to the general riverine HSI riffle velocity
variable (V,).

Va

Refer to the general riverine HSI riffle depth variable
(Va).

Vg

Refer to the general riverine HSI instream/shoreline
cover variable (Vg).

VlO

Refer to the general riverine HSI percent pool variable
(VlO).

Va

White suckers have been observed spawning over gravel
(Curry 1979) and sand/gravel substrates. These sub-
strates are considered to be excellent (Dence 1948;
Minckley 1963). It is assumed that substrates of silt,
mud, and large gravel and boulders are suboptimum.

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