CONTENTS 



Page 



CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 6 



I INTRODUCTION 7 



II DESCRIPTION OF STUDY AREA 9 



1 . General 9 



2. Siletz and Netarts Bays 10 



3. Bay Study Areas 13 



III METHODS 16 



1. General 16 



2. Invertebrate Studies 16 



3. Fish Studies 21 



IV RESULTS 22 



1 . General 22 



2. Taxonomic Structure of Invertebrate Communities 23 



3. Trophic Structure of Invertebrate Communities 32 



4. Composition of Fish Communities 32 



5. Fish Food Habits 37 



V DISCUSSION 41 



VI CONCLUSION ...... 50 



LITERATURE CITED 51 



APPENDIX 



A CRITIQUE OF METHODS 55 



B TAXONOMIC LIST OF INVERTEBRATES 56 



C TAXONOMIC LIST OF FISH 58 



D INVERTEBRATE SAMPLE DATA 59 



E FISH SAMPLE DATA 87 



F FISH FOOD HABITS DATA 97 



TABLES 



1 Salinity and temperature readings 12 



2 Substrate characteristics of marsh soils 14 



3 Description of sampling gear and methods 18 



4 Occurrence of fish species in marsh and nonmarsh habitats 36 



5 Size of fish species collected in marsh and nonmarsh habitats 37 



6 Invertebrates characteristic of terrestrial habitats 43 



7 Invertebrates characteristic of aquatic habitats 44 



