7863

• UCREFRP Catalog Number: 7863
• Author: Nature Conservancy, T.
• Title: Candidate Species Reports from the Natural Heritage Central Database.
• USFW Year: 1996.
• USFW - Doc Type: \
• Copyright Material: NO

GRANGE:
GRANGECOM:

GTREND:
GTRENDCOM:

GPROTEOS:
GPROTCOM:

~

B
Historically recorded in 13 states of the Mississippi and
Missouri rivers and their larger tributaries. Currently
known from Missouri, Nebraska, Montana, and North Dakota
(USFWS). ^Mississippi River between confluence with Ohio and
Missouri rivers and (formerly) in southern Mississippi and
northern Louisiana; Missouri River from mouth to Montana;
lower Kansas River in eastern Kansas (few records); fairly
common in the middle Missouri River, rare elsewhere (Page
and Burr 1991) .

B

U
See Federal Register (18 January 1995, p. 3614) for state
conservation classifications applicable in the mid-1990s.

B
Decline has resulted from human-induced changes in river
conditions. Dams have flooded river habitat, altered
temperature and flow regimes, reduced sediment transport and
turbidity, fragmented populations, and reduced movement
opportunities. Channeliza~ion has reduced habitat diversity
and, reduced overbank flooding. pollution and water depletion
from' industry and agriculture may have altered water
quality. Sand and gravel excavation have removed habitat and
restricted fish movements in some areas. Further water
depletion is likely to occur in the future due to energy
development in the Upper Missouri River Basin, increased
interbasin transfer of water, and increased municipal,
industrial, and irrigation use. Dredging for channel
maintenance and sand/gravel extraction will continue in new
areas. May be negatively impacted by the numerous species of
non-native fishes that have been introduced into the habitat
(Federal Register 60(11) :3613-3615, 18 January 1995).

GFRAGIL: C
GFRAGILCOM: Tolerant of nondestructive intrusion.

GTHREAT:
GTHREATCOM:

GOTHCONSID:

Rank and Reasons:

GRANK:
GREASONS:

G3 GREVDATE: 95-09-20
Range in the Mississippi and Missouri rivers and their major
tributaries has decreased substantially, due to human-caused
habitat alteration/fragmentation.

Needs:
GRSRCHNEED: See USFWS 1993:23-27.
GINVENNEED: See USFWS 1993:23-27.
GPROTNEED: See USFWS 1993:23-27.
GSTEWNEED: See USFWS 1993:23-27.
References: