8092

• UCREFRP Catalog Number: 8092
• Author: U.S. Department of the Interior.
• Title: Proceedings of the Symposium on Restoration Planning for the Rivers of the Mississippi River Ecosystem.
• USFW Year: 1993.
• USFW - Doc Type: Washington, D.C.
• Copyright Material: NO

Maximum species richness lines for metries ad-
dressing the number of species present were deter-
mined graphically using the historical and refer-
ence (1990) databases. Expected values for metries
dealing with percent composition of the catch and
for metries 11 and 12 were determined only from
the 1990 reference site database. Sampling tech-
niques in the historical database varied widely,
which could affect the relative abundance of species
collected.
Drainage area is considered an adequate meas-
urement of stream size and may be better than
stream order (Hughes and Omernik 1981). Drain-
age area was also chosen because it was the infor-
mation most readily available for streams within
this basin. Alternative measurements of stream
size, such as mean annual discharge or mean width,
were not available.
In determining the 5, 3, and 1 scoring for each
metric, the procedure described by Ohio Environ-
mental Protection Agency (1987) was followed. The
data were plotted against a loglO transfonnation of
drainage area. The graph was examined to deter-
mine if there was a positive relation with drainage
area and over what range of stream sizes this

CHRISTOPHER M. KAVANAUGH 17

relation occurred. H a positive relation occurred
through any range of stream sizes, a line was drawn
to incorporate about 90% of the 1990 reference
sites. The area beneath this line was then trisected
equally. Where a positive relation was not found,
an alternative trisection method was used. For
these metries, a horizontal 5% and 95% line was
determined, and the area between them was tri-
sected.
Sixty-four fish species representing 17 families
were collected in 1990 (Table 7). Fifty-four species
were collected in 13 boom electrofishing stations,
49 species from 16 stream electrofishing stations,
and 30 species from 16 backpack electrofishing
stations. The boom electrofishing stations had a
higher percent composition (59.2%) of large fishes
(excludes minnow, darter, and other small fish
species) compared with the stream (18.7%) and
backpack (6.5%) stations.
The IHI scores for the 1990 reference sites
ranged from 20 to 56. The median score was 36, and
the mean was 37.5. Karr et al. (1986) considered
illI values less than 34 (out of a possible score of GO)
as representative of poor or very poor conditions.

Table 7. Fish species sampled at 45 reference sites in 1990a, occurring in the historical data base, and
reported in Underhill (1989).

Historical
Scientific name Common name data Underhill

Ichthyomyzon unicuspis Silver lamprey a X
Lampetra appendix American brook lamprey x x
Scaphirhyncus platorynclms Shovelnose sturgeon a X X
Polyodon spatlwla Paddlefish X X
Lepisosteus osseus Longnose gar X X
L platostomus Shortnose gar a X X
Amia calva Bowfin X x
Hiodon alosoides Goldeye a X X
H tergisus Mooneye a X X
Anguilla rostrata American eel a X X
Dorosoma cepedianum Gizzard shad a X X
Campostoma anomalum Central stoneroller a X X
C. oligolepis Largescale stoneroller a X X
Carassius auratus Goldfish X X
Cyprinella spiloptera Spotfin shiner a X X
Cyprinus carpio Common carp a X X
HybognatJws hankinsoni Brassy minnow a X X
Luxilus comutus Common shiner a X X
Macrhybopsis aestivalis Speckled chub X X
M. storeriana Silver chub X x
Margariscus margarita Pearl dace x X
Nocomis biguttatus Homyhead chub a x X
Notemigonus crysoleucas Golden shiner x x
Notropis anogenus Pugnose shiner x