1110

• UCREFRP Catalog Number: 1110
• Author: Lamarra, V., M. Lamarra and J. Carter
• Title: Ecological Investigation of a Suspected Spawning Site of Colorado Squawfish on the Yampa River, Utah
• USFW Year: 1985
• USFW - Doc Type: Great Basin Naturalist
• Copyright Material: YES

January 19$5 LAMARRA ET AL.: SQUAWFISH 129
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Fig. 1. Discharge levels in the Yampa River during 1980 and 1981. Sample times for the CRFP and this study are
given.
The weight loss on ignition was calculated as ter (American Public Health Association
organic content. 1980).
Periphyton biomass was determined by
scraping a flat area 4.6 cm in diameter from RESULTS
each rock collected. This scraped material
was extracted for chlorophyll in 250 mis of Transect Sites
90°70 acetone. Core samples containing sand
or silt were placed directly into 250 ml of Steep canyon walls always occur on at
acetone for extraction. Chlorophyll a was de- least one shore of the river between miles
termined with a Turner Model III fluorome- 16.5 and 18.0. Cobble-covered islands and
TABLE 1. Continued
site traction Macroinvertebrates
of the total Total Total
detritus Total biomass
C D E Organics (gms/m~) (#/m~) (gms/m~)
6.2 24.8 20.2 .2 9.2 69.2 1.0
4.1 25.0 26.2 .03 16.9 48.1 1.0
15.3 33.7 45.3 0.6 15.6 186.5 1.0
25.6 25.3 28.3 0.8 20.7 203.2 1.3
10.5 2.5 -O- -0- 1.4 762.0 4.5
6.4 0.7 -0- -0- 1.6 879.6 9.0
7.7 4.0 0..3 -0- 2.7 233.3 8.1
4.2 2.0 0.6 -0- 3.3 24.7 2.1
10.2 38.6 23.8 0.3 12.2 53.3 1.8
9.1 26.8 30,6 0.3 I6.7 28.9 2.6
7.0 1.2 0.8 -0- 1.1 302.9 ] 3.8
4.7 1.3 0.5 -0- 0.9 193.0 7.3