8178

• UCREFRP Catalog Number: 8178
• Author: Anderson, R. and G. Stewart.
• Title: Riverine Fish Flow Investigations.
• USFW Year: 1999.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

Table 9. Invertebrate density, count, and diversity of shallow, middle and deep
samples in the Yampa River, September 1998.

DUFFY TUNNEL CROSS MOUNTAIN COMBINED
SHALLOW MEDIUM DEEP SHALLOW MEDIUM DEEP SHALLOW MEDIUM DEEP
Number of specimens per depth group
TOTAL 412 975 495 419 442 321 831 1417 816
DENSITY
Mayflies 175 193 47 160 84 51 335 277 98
Caddis flies 172 550 394 230 339 259 402 889 653
Stoneflies 7 14 6 4 7 1 11 21 7
Diptera 28 189 32 17 7 7 45 196 39
Beatles 9 19 8 5 3 2 14 22 10
Bugs 0 0 0 0 1 0 0 1 0
Leptodoptera 0 3 1 0 1 1 0 4 2
Odonata 0 0 0 2 0 0 2 0 0
Snail 11 5 6 1 0 0 12 5 6
Oligochaeta 10 2 1 0 0 0 10 2 1
Number of taxa per depth group
TOTAL 28 35 26 30 25 25 38 39 35
COUNT
Mayflies 10 10 5 12 10 9 13 12 11
Caddisflies 5 8 8 8 8 9 8 9 10
Stonej1ies 2 2 2 1 1 1 2 2 2
Diptera 6 7 7 5 3 3 7 8 7
OTHERS 5 8 4 4 3 3 8 8 .s
Percentage
Mayflies 42.5% 19.8% 9.5% 38.2% 19.0% 15.9% 40% 20% 12%
Caddisflies 41. 7% 56.4% 79.6% 54.9% 76.7% 80.7% 48% 63% 80%
Stone flies 1.7% 1.4% 1.2% 1.0% 1.6% 0.3% 1% 1% 1%
Diptera 6.8% 19.4% 6.5% 4.1% 1.6% 2.2% 5% 14% 5%
OTHERS 7.3% 3.0% 3.2% 1.9% 1.1% 0.9010 5% 2% 2%
S.W. 3.47 4.50 2.92 3.73 3.13 3.06 3.77 3.60 3.19
DIVERSITY
DENSITY 206 489 248 210 221 161 208 355 204
;(#/FT )

HABITAT COMPOSITION

Preliminary analysis of habitat composition were based on habitat typing made
subjectively during field surveying, not on results of hydraulic modeling that quantified
surface area of habitat type possessing combinations of depth and velocity attributes.
The quantification of habitat types is still in process and will be presented in next years'
progress report.

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