|
<br />SJRIP Biology Committee
<br />February 1999
<br />
<br />T-8
<br />
<br />Table of Contents
<br />Flow Report
<br />
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />I
<br />
<br />0 Figure 4,8,
<br />l~
<br />l'~ Figure 4,9.
<br />,oA
<br />en Figure 4,10
<br />
<br />HEC-6 calibration results for Sand Island and Montezuma Creek. . , , . . , , . . . 4 - 25
<br />
<br />Modeling results with small change in grain size
<br />to demonstrate sensitivity. ..,.'...........,....,....,.,..,'.."... 4 - 26
<br />
<br />A comparison, by reach and year (1995 top, 1996 middle, 1997 lower)
<br />for sediment depth (left column) and water depth (right column)
<br />in San Juan River backwaters during August.. . . . . . . . . . . . . . . . , . . , , . . . . . 4 - 35
<br />
<br />Figure 4.11. A comparison by reach in August 1995 (upper), 1996 (middle),
<br />and 1997 (lower) of the averages for invertebrates (left column),
<br />periphyton (middle column), and detritus (right column)
<br />in the San Juan River. ........................,....,.",..,..",. 4 - 36
<br />
<br />Figure 4.12. The response of invertebrates biomass estimates
<br />during two separate time periods corresponding to a stable period
<br />(November 1995 to April 1996, above) and an unstable period
<br />(December 1996 to April 1997, below) in backwaters of the San Juan River. . 4 - 38
<br />
<br />Figure 4.13. The response of periphyton biomass estimates
<br />during two separate time periods corresponding to a stable period
<br />(November 1995 to April 1996, above) and an unstable period
<br />(December 1996 to April 1997, below) in backwaters of the San Juan River. ,4 - 39
<br />
<br />Figure 4.14. Locations of wild Colorado pikeminnow collections in the San Juan River
<br />from 1987 to 1996. . , . . . . . . . . . . , , . . . . . . . . . . . . . . . . . . . . , . . , , . . . , . . . 4 - 43
<br />
<br />Figure 4.15. Simple verses complex habitat areas mapped
<br />from River Mile (RM) 106.9 and 129.9 of the San Juan River. . , . . . , . . . , . . . 4 - 45
<br />
<br />Figure 4.16. Flows during August UDWR YOY sampling trips on the San Juan River. ..., 4 - 56
<br />
<br />Figure 4.17. Length-frequency histogram for flannelmouth sucker
<br />collected during October USFWS electrofishing surveys
<br />on the San Juan River (RM 52 to 158). Age-2 fish in 1995 (1993 cohort)
<br />are in the 176 to 250 mm size range. . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . 4 - 58
<br />
<br />Figure 4.18. Average catch rates for juvenile and adult f1annelmouth
<br />and bluehead sucker collected curing October (1991-97) USFWS
<br />electrofishing surveys in the San Juan River between RM 2 and 158. . . . , . . , 4 - 58
<br />
<br />Figure 4.19, Flows during spring and fall USFWS electrofishing trips
<br />on the San Juan River. ....,.......,..,'.,.........",...,...,... 4 - 59
<br />
<br />Figure 4.20. Regression line fitted to plot of average catch rates of flannelmouth sucker
<br />collected during October (1991 to 1997) USFWS San Juan River
<br />electrofishing surveys versus sampling trip discharge (as measured
<br />at USGS gage 09371010, Four Corners, New Mexico). , , . . . . , . . , . . . , . . . . 4 - 59
<br />
|