7399

• UCREFRP Catalog Number: 7399
• Author: Valdez, R. A., P. B. Holden and T. B. Hardy
• Title: Habitat Suitability Index Curves for Humpback Chub of the Upper Colorado River Basin
• USFW Year: 1990
• USFW - Doc Type: Rivers
• Copyright Material: YES

data. may reflect a fish
)m preferred microhab-
. site. Of, equal concern
It passive gears such as
nets may intercept fish
desired microhabitats.
lemetry data were pre-
insufficient numbers of
. curve development, and
"ear data were also used.
:J
:ohabitat data were se-
mt gear types, the curve
lfidence rating of B. The
~d by adults was 10.3 feet
of 40.1 feet, and average
fps with a range of 0 to
igure 6). The depth curve
modified by the experts
use of all water depths
t 7.2 feet. The experts felt
sample size from greater
gear inefficiency and not
the fish. Although the
I to inhabit regions with
or greater, the experts felt
19 was consistently effec-
t 10 feet depth, while gill
ts were difficult to set ef-
'reater depths, and radio-
~ission was reliable from
~et of depth. Most of the
~ater water depths resulted
ld angling captures. The
ld over boulders and bed-
'ening deposits of silt and
set for adults was applied
olorado River Basin from
lber and was not restricted
l habitat constraint. No
~ was developed for this
the experts felt that not
)wn about its spawning ac-

crohabitat information scattered through
many literature sources and reports. The
concept of assimilating the data for eval-
uation by a panel of species experts was
sound in that it allowed for a joint review
by the experts without each investing large
amounts of time to independently research
the data. The idea of open workshops, in
which experts and participants were given
equal opportunity to express opinions, also
worked well. However, most experts and
participants felt that a third workshop
should have been held to participate in the
use of the 51 curves in the PHAB51M models
and generation of weighted usable area.
This would have allowed the experts to
voice their judgment on the biological
soundness of the streamflow to habitat re-
lationships.

ACKNOWLEDGMENTS

The development of SI curves for humpback
chub is part of a larger project entitled Habitat
Suitability Index Curves For Endangered Fishes Of The
Upper Colorado River. This project was funded by
the U.s. Fish and Wildlife Service under Contract
No. 14-16-0006-86-055 issued to BIO/WEST, Inc.
We thank Ron Ryel for assisting in the data anal-
yses. Also, we thank Patrick Nelson, John Hamill,
Harold Tyus, Lynn Kaeding, Steve Lanigan, and
Keith Rose of the U.S. Fish and Wildlife Service;
Robert Williams and Reed Harris of the Bureau of
Reclamation; Patrick Martinez of the Colorado Di-
vision of Wildlife, Randy Radant of the Utah Di-
vision of Wildlife Resources; Edmund Wick of Col-
orado State University; and Tom Pitts of the
Colorado Water Congress, for their participation
in the project and for their valuable input into the
development of these SI curves.

REFERENCES

Armour, C. 1., R. J. Fisher, and J. W. Terrell. 1984. Comparison of habitat evaluation pro-
cedures (HEP) and the instream flow incremental methodology (IFIM) for aquatic re-
sources. Washington, DC: U.S. Fish and Wildlife Service (FWS/OBS-84/11).
Bovee, K. D. 1982. A guide to stream habitat analysis using the instream flow incremental
methodology. Instream Flow Information Paper No. 12. Washington, DC: U.S. Fish and
Wildlife Service (FWS/OBS-82/26).
-. 1986. Development and evaluation of habitat suitability criteria for use in the in-
stream flow incremental methodology. Instream Flow Information Paper No. 21. Wash-
ington, DC: U.S. Fish and Wildlife Service (Biological Report 86[7]).
Bovee, K. D., and T. Cochauer. 1977. Development and evaluation of weighted criteria,
probability-of-use curves for instream flow assessments: Fisheries. Washington, DC: U.s.
Fish and Wildlife Service (FWS/OBS-77/63).
Crance, J. H. 1984. Habitat suitability index models and instream flow suitability curves:
Inland stocks of striped bass. Washington, DC: U.S. Fish and Wildlife Service (FWS/OBS-
82/10.85).
-. 1987. Habitat suitability index curves for paddlefish, developed by the Delphi tech-
nique. North American Journal of Fisheries Management 7(1):123-130.
Glova, G. J. 1982. Fishery impact evaluation: Application of the incremental method. Pages
16-27 in R. H. S. McColl, editor. River low flows: Conflicts of water use. Wellington: New
Zealand Ministry of Works and Development (Water and Soil Miscellaneous Publication
47).
Haan, C. T. 1977. Statistical methods in hydrology. Ames: Iowa State University Press.
Holden, P. B. 1977. Habitat requirements of rare fishes in the Green River from Jensen to
Green River, Utah. Fort Collins, CO: U.S. Fish and Wildlife Service (FWS/OBS-77/65).
Larimore, R. W., and D. D. Garrels. 1985. Assessing habitats used by warmwater stream
fishes. Fisheries 10(2):10-16.
Linstone, A. A., and M. Turoff, editors. 1975. The Delphi method. Reading, MA: Addison-
Wesley.
Milhous, R. T. 1979. The PHABSIM system for instream flow studies. Pages 440-446 in 1.
Levine, editor. Proceedings of the 1979 summer computer simulation conference. LaJo11a, CA:
Society for Computer Simulation.
Milhous, R. T., D. 1. Wegner, and T. Waddle. 1981. User's guide to the physical habitat
simulation system. Washington, DC: U.s. Fish and Wildlife Service (FWS/OBS-81/43).
Orth, D. J., and O. E. Maughan. 1982. Evaluation of the incremental methodology for rec-
ommending instream flow for fishes. Transactions of the American Fisheries Society 111(4):
413-445.

presently recommend ~p-
~ adult curve set, recogmz-
information still needs to
the rare fishes of the upper
~rts recommended refining
, more data become avail-

by which these 51 curves
d is recommended in deal-
volumes of pre-existing mi-

January 1990 J

[ R. A. Valdez et a1.

41 I I~