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along with fish stomach contents, are presented as relative frequency histograms 

 and pie charts. Dominant invertebrate taxa in terrestrial collections were 

 Acarina, Homoptera, and Diptera, and in aquatic collections were Capitellidae 

 (polychaeta) , Oligochaeta, Gnorimosphaevoma (Isopoda), and Anisogarrmarus and 

 Corophiim (Amphipoda) . Three-spine stickleback and young staghorn sculpin were 

 by far the most common fish species throughout the marsh zone; juvenile sal- 

 monids and other species were captured only in submerged level marshes and in a 

 slough. Trophic structure of terrestrial and aquatic invertebrate communities 

 was generally heavily weighted to detritivores and scavengers. The herbivore 

 component increased from low marsh to high marsh and was the dominant trophic 

 type in the higher vegetation (sweep net collections) of the high marsh. Araneae 

 was the dominant invertebrate carnivore in the terrestrial communities. Fish 

 consumed primarily aquatic animals, even those captured in tidal creek and sub- 

 merged level marsh habitats where tidal inundation would be expected to make 

 terrestrial foods available. The detritus food chain appears more important 

 than the grazing food chain in the terrestrial communities, and transfer of 

 marsh products to aquatic food chains apparently is predominantly through the 

 export of detritus rather than by the direct consumption of terrestrial animals 



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