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March 3, 2009

Placer County Water Agency Middle Fork American River Project AQ 3 – Aquatic Mollusk Technical Study Report – 2008. March 3, 2009. Aquatic Mollusk Study Objectives. Macroinvertebrate Study Objectives.

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March 3, 2009

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  1. Placer County Water AgencyMiddle Fork American River ProjectAQ 3 – Aquatic Mollusk Technical Study Report – 2008 March 3, 2009

  2. Aquatic Mollusk Study Objectives Macroinvertebrate Study Objectives Determine the presence or absence of three special-status mollusk species and identify potentially suitable habitat for these species. Document the benthic macroinvertebrate (BMI) community in the peaking reach and compare to adjacent bypass and comparison reaches to characterize general habitat conditions. Sample the BMI community at long-term USDA-FS sampling sites to supplement existing data sets. Document the BMI community in the bypass reaches downstream of each large reservoir. Document the BMI community in areas with known water quality issues, if any are identified in the AQ 11 - TSP. Document the seasonal density and size distribution of drifting macroinvertebrates in selected bypass reaches and the peaking reach for input to bioenergetics growth and habitat modeling. Conduct 2008 Mollusk Field Studies Document 2008 Mollusk Findings in the AQ 3 - Aquatic Mollusk Technical Study Report - 2008 Conduct 2007 Macroinvertebrate Field Surveys Conduct SWAMP Benthic Sampling Conduct CSBP Benthic Sampling at the Ralston Afterbay Sediment Management Project Monitoring Sites Conduct Drift Sampling Document 2007 Findings in the AQ 3 - Macroinvertebrate and Aquatic Mollusk Technical Study Report - 2007 Document 2007 Findings in the AQ 5 - Bioenergetics Technical Study Report - 2009 Consult with Aquatic TWG Discuss Contingency Sampling Based on Water Quality (AQ - 11) Results No Contingency Studies Needed, Based on Consultation with TWG

  3. 2008 Mollusk Study Sites • Representative Habitat Study Sites • Comparison Study Sites • Incidental Mussel Observation Study Sites

  4. Distribution Surveys for Aquatic Mollusk Species • Approach • Conducted surveys for 3 special-status mussel and snail species • California floater (Anodonta californiensis) • Scalloped juga (Juga (Calibasis) occata) • Great Basin rams-horn snail (Helisoma newberryi) • Surveys included identification and abundance estimates for all aquatic and incidental terrestrial mollusks

  5. Aquatic Bivalves (Mussels and Clams) Found at the Study Sites

  6. Aquatic Gastropods (Snails) Found at the Study Sites

  7. Distribution Surveys for Aquatic Mollusk Species • Key Findings • Special-status Species Mollusk Species • No live specimens or shells were found at any of the study sites • Aquatic Mollusk and Incidental Species • 4 bivalve species (Margaritifera falcata and 3 peaclams) and 5 gastropods were found in the study sites • Most are common native species that occur throughout North America • 5 native terrestrial gastropod species and the signal crayfish (not native) were found in the study sites

  8. Distribution and Abundance of Aquatic Bivalves in the Study Sites

  9. Distribution and Abundance of Aquatic Gastropods in the Study Sites

  10. Distribution and Abundance of Aquatic Mollusks in the Study Sites

  11. Distribution and Abundance of Aquatic Mollusks in the Study Sites

  12. Distribution and Abundance of Aquatic Mollusks in the Study Sites

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