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CHAPTER III. PHYSICAL CHARACTERISTICS 15 



Temperature and Dissolved Oxygen 15 



Water Transparency 27 



Sediments 27 



CHAPTER IV. BENTHIC BIOLOGfY 31 



Results 31 



Aquatic Plants 31 



Bottom Fauna 2i^ 



Nxanters and Volume at Selected Stations 3k 



Seasonal Variations 6l 



Discussion 62 



Annelida 6U 



Oligochaeta 6k 



Polychaeta «. 6h 



Crustacea 64- 



Amphlpoda 6k 



Insecta 65 



Trlchoptera 65 



Ochrotrlchla 65 



Hydropsyche 65 



Agapetus 65 



Lepidostoma 66 



Ochrotrlchla and Lepldostcnia 66 



Plecoptera 67 



Diptera 68 



Tanyderldae 68 



Tlpulldae 68 



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