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The depth of the summer mixed layer (E d ) of 21 Canadian Shield lakes in northwestern Ontario was examined in relation to lake size (surface area, A 0 ) and water clarity (extinction coefficient, K d ) for periods ranging from 2 to 23 yr (n = 1,408). The lakes range in A 0 from 4 to 4.9 x 10 5 ha, and midsummer (mid-June through mid-August mean) K d varied from 2.5 m -1 with greatest variation in small lakes that were experimentally eutrophicated or acidified or whose terrestrial basins were burned. Over the full spectrum of lake sizes, A 0 was the primary determinant of E d ; transparency significantly modified this relationship but only in small lakes (A 0 |
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