Survey of Columbia River Basin streams for Columbia pebblesnail Fluminicola columbiana and shortface lanx Fisherola nuttalli
- Pacific Northwest Lab., Richland, WA (United States)
- Deixis Consultants, Seattle, WA (United States)
At present, there are only two remaining sizable populations of Columbia pebblesnails Fluminicola columbiana; those in the Methow and Okanogan rivers, Washington. Smaller populations survive in the Hanford Reach of the Columbia River, Washington, and the lower Salmon River, Idaho, and possibly in the middle Snake River, Idaho; Hells Canyon of the Snake River, Idaho, Washington, and Oregon, and the Grande Ronde River, Oregon and Washington. Neither large population is at present protected, and there has been a substantial documented reduction in the species' historic range. Large populations of the shortface lanx Fisherolla nuttalli persist in four streams: the Deschutes River, Oregon; the Hanford Reach and Bonneville Dam area of the Columbia River, Washington and Oregon; Hens Canyon of the Snake River, Idaho and Oregon; and the Okanogan River, Washington. Smaller populations, or ones of uncertain size, are known from the lower Salmon and middle Snake rivers, Idaho; the Grande Ronde Washington and Oregon; Imnaha, and John Day rivers, Oregon; and the Methow River, Washington. While substantial range reduction has occurred in this species, and the large populations are not well protected, the problem is not as severe as in the case of the Columbia pebblesnail. Both species appear to have been widespread historically in the mainstem Columbia River and the Columbia River Basin prior to the installation of the current dam system. Both are now apparently reduced within the Columbia River to populations in the Hanford Reach and possibly other sites that are now separated by large areas of unsuitable habitat from those in the river's major tributaries.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 7032141
- Report Number(s):
- PNL-8229; ON: DE92019879
- Country of Publication:
- United States
- Language:
- English
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Survey of Columbia River Basin streams for Columbia pebblesnail Fluminicola columbiana and shortface lanx Fisherola nuttalli
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Related Subjects
54 ENVIRONMENTAL SCIENCES
DAMS
ENVIRONMENTAL EFFECTS
MOLLUSCS
POPULATIONS
COLUMBIA RIVER
COLUMBIA RIVER BASIN
COMPILED DATA
SNAILS
SURVEYS
ANIMALS
AQUATIC ORGANISMS
DATA
INFORMATION
INVERTEBRATES
NUMERICAL DATA
RIVERS
STREAMS
SURFACE WATERS
WATERSHEDS
130600* - Hydro Energy- Environmental Aspects
540350 - Environment
Aquatic- Site Resource & Use Studies- (1990-)