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Bivalve Monitoring: Figure 4.1

Contents
1. Introduction
2. Water Monitoring
3. Sediment Monitoring
4. Bivalve Monitoring
  4.1 Background
  4.2 Accumlation Factors
  4.3 Guidelines
  4.4 Biological Condition & Survival
  4.5 Trends
  4.6 Discussion
  4.7 References
5. Condition of the Estuary
6. Description of Methods
7. QA Tables
8. Data Tables

 

Tables

4.1 Tissue Guidelines

 

Figure 4.1. Arsenic concentrations in parts per million dry weight (ppm) in three transplanted bivalve species at 15 RMP stations during the wet- and dry-season sampling periods. M indicates matrix interference, and B indicates blank contamination. There were no samples for Dumbarton Bridge (BA30), Redwood Creek (BA40), and Red Rock (BC61) in the wet season due to zero percent species survival. Bivalves were not deployed at Davis Point (BD40) in the wet season. T-0 (time zero) is the initial concentration before deployment in the Estuary. Accumulation factors ranged from 0.55 (depuration) to 1.22. Median concentrations were highest in M. californianus, intermediate in C. gigas, and lowest in C. fluminea. The highest measured concentration was in C. gigas, at Sacramento River (BG20) in the dry season.

Figures

 

4.1 Arsenic
4.2 Cadmium
4.3 Chromium
4.4 Copper
4.5 Lead
4.6 Mercury
4.7 Nickel
4.8 Selenium
4.9 Silver
4.10 Tributyltin

 

 

4.11 Zinc
4.12 Total PAH
4.13 Total PCB
4.14 Total DDT
4.15 Total Chlordane
4.16 Dieldrin
4.17 Survival
4.18 Condition Indices
4.19 Arsenic Trends
4.20 Cadmium Trends

 

 

4.21 Chromium Trends
4.22 Copper Trends
4.23 Lead Trends
4.24 Mercury Trends
4.25 Nickel Trends
4.26 Selenium Trends
4.27 Silver Trends
4.28 Zinc Trends
4.29 PAH Trends
4.30 PCB Trends
4.31 DDT Trends

 

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