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FIQ. 5. The relationship between the total triclad population 4nd the Total Dissolved
Matter content (TDM) of the water; the regression line is also shown. Unfilled circles refer
to lakes >500 ft ( > 152 m) above sea-level. E, Loch Camilla; F, Loch Kinghorn; other
letters as in Fig. 4. Location of lakes shown in Fig. 2, Reynoldson (1958a).