The ecology of algae The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 ecologyofalgaesy00tryo Year: 1960 L IGHT ^iiiiiiiiiiiiiMMMMiMJ 'V''T'*'*''''H''''''n 6 12 18 TIME OF DAY IN HOURS DIURNAL OXYGEN RELATI ONS I N A HYPOTHETICAL STREAM SECTION F i Qure 5 Modi fled from Odurr, 1956 61

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