7908

• UCREFRP Catalog Number: 7908
• Author: Valdez, R. A. and R. J. Ryel.
• Title: Life History and Ecology of the Humpback Chub ‎(
• USFW Year: 1995.
• Copyright Material: NO

Final Report

Study Design . 2-3

Table 2-1. Lengths of sample strata within the 11 geomorphic reaches.
Study Length
Region Geomorphic Reach Sample Strata River Miles km(mi)
0 1 - Permian Section a. Paria - Badger Creek 1.0-8.0 11 .3 (7.0)
b. Badger Creek - Soap Creek 8.0-11.3 5.3 (3.3)
2 - Supai Gorge c. Soap Creek - Sheer Wall 11.3-14.5 5.1 (3.2)
d. Sheer Wall - House Rock 14.5-17.0 4.0 (2.5)
e. House Rock - North Canyon 17.0-22.6 9.0 (5.6)
3 - Redwall Gorge 1. North Canyon - Tiger Wash 22.6-26.5 6.3 (3.9)
g. Tiger Wash - Vasey's 26.5-35.9 15.1 (9.4)
4 - Lower Marble Canyon h. Vasey's - President Harding Rapid 35.9-43.7 12.6 (7.8)
I. President Harding Rapid - Nankoweep 43.7~52.0 13.4 (8.3)
j. Nankoweep - Kwagunt 52.0-56.0 6.4 (4.0)
4 - Lower Marble Canyon a. Kwagunt - LCR 56.0-61.5 8.9 (5.5)
5 - Furnace Flats b. LCR - Chuar Rapid 61.5-65.5 6.4 (4.0)
c. Chuar Rapid - Unkar Rapid 65.5-72.5 11.3 (7.0)
d. Unkar Rapid - RM 77.4 72.5-77.4 7.9 (4.9)
II 6 - Upper Granite Gorge a. Hance Rapid - Cremation Canyon 77.4-86.5 14.6 (9.1)
b". Bright Angel Creek 86.5-89.0 4.0 (2.5)
c. Pipe Creek - Crystal Rapid 89.0-98.0 14.5 (9.0)
d: Crystal Rapid - Bass Rapid 98.0-107.8 15.8 (9.8)
ea. Shinumo Creek 107.8-109.8 3.2 (2.0)
f. 110-mile Rapid - RM 117.8 109.8-117.8 12.9 (8.0)
7 - Aisles g. Aisles 117.8-125.5 12.4 (7.7)
8 - Middle Granite Gorge h. RM 125.5 - Dubendorf SSR 125.5-131.7 9.8 (6.2)
." Tapeats Creek 131.7-134.5 4.5 (2.8)
I.
j. 134 Mile Rapid - RM 140.0 134.5-139.9 8.7 (5.4)
9 - Muav Gorge k". Kanab Creek 139.9-143.8 6.3 (3.9)
I. Kanab Rapid - Sinyala Rapid 143.8-153.5 15.6 (9.7)
m". Havasu Creek 153.5-159.9 10.3 (6.4)
III 10 - Lower Canyon a. RM 160.0 - RM 169.9 159.9-169.9 15.8 (9.8)
b. RM 169.9 - Lava Falls 169.9-179.4 15.3 (9.5)
c. Lava Falls - RM 189.1 179.4-189.1 15.6 (9.7)
d. RM 189.1 - RM 200.0 189.1-200.0 17.5 (10.9)
e. RM 200.0 - 209-Mile Rapid 200.0-208.9 14.3 (8.9)
f. 209-Mile Rapid - 214 Mile Cr 208.9-213.9 8.0 (5.0)
11 - Lower Granite Gorge g. 214-Mile Cr - Diamond Creek 213.9-226.0 19.6 (12.1)
"Tributary strata

Shinumo Creek, Tapeats Creek, Kanab Creek, and
Havasu Creek) were each treated as unique strata;
these were selected and sampled at least once
seasonally to insure adequate temporal
characterization of areas.

The length of each sampling stratum was
determined primarily by the distance of river
between large rapids that was repeatedly accessible
by research boats (See Box 2-1.), and by the
location of temporary riverside camps for setting

and retrieving sampling gear and tracking radio-
tagged fish. Whitewater rapids too large or swift to
ascend with small motorized research boats
prevented repeated access to sample sites and
frequently delineated stratum boundaries.

Sampling was conducted monthly and at different
times of the day and night to account for seasonal
and daily variation (Fig. 2-3). Sample effort was
partitioned by season to represent winter
(December-February), spring (March-May),