Mollusk Survey in the Snake River, Hells Canyon, USA
Abstract
We conducted surveys and several experiments on mollusks, focusing on listed, rare, or sensitive species, in reservoirs, tributaries and main stem of the Snake River in Hells Canyon Idaho and Oregon, USA. The most important result of this study was documentation of the undescribed Taylorconcha sp. throughout the Snake River in Hells Canyon, although we did not find Taylorconcha sp. within 12 miles downstream of HCD, most likely due to river armoring. Additional results include: 1) the mollusk community was similar throughout the Snake River, except where the Salmon River entered the Snake River; 2) Taylorconcha sp. abundance was directly related to the abundance of Potamopyrgus antipodarum, a highly invasive snail, and with moderate abundance of detritus; 3) hand picking cobbles was more efficient than suction dredging for snails and limpets but not for bivalves, 4) the most abundant mollusks were two invasive species, P. antipodarum and Corbicula fluminea and; 5) only one live small colony of native Gonidea angulata (Unionidae) and no live Anodonta californiensis (Unionidae) were found in the survey.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2005
- Bibcode:
- 2005AGUSMNB33P..16L
- Keywords:
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- 9800 GENERAL OR MISCELLANEOUS