11.4 Water Clarity and Seagrass Lower Depth Limit.77 
11.4.1 Background.77 
11.4.2 Methods.78 
11.4.3 Relationship between Lower Margin and Water Clarity.78 
11.5 Epiphyte Patterns and Impact on Z. marina .82 
11.5.1 Spatial and Temporal Patterns in Epiphytes.82 
11.6 Zostera marina Light Requirements.84 
12. Stress-Response Approach for Protection of SAV.88 
12.1 Introduction.88 
12.2 Description of Model.88 
12.3 Model Simulations and Input Data.90 
12.4 Results.91 
12.5 Discussion.94 
13. Conclusions and Recommendations.97 
13.1 Recommendations.99 
References.102 
Appendix A: Benthic Processes in Yaquina Estuary.122 
Appendix B: Description of Methods and Quality Assurance Procedures.128 
Appendix C: Classification of Oregon Estuaries.156 
Appendix D: Survey of Effects of Macroalgae on Biota.159 
Appendix E: Stress-Response Model Calibration, Input Data, and Results.162 
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