Which lake is likely to be the shallowest and why? Which lake do you think is th

Question

Which lake is likely to be the shallowest and why? Which lake do you think is the most eutrophic and why? Which is likely the most oligotrophic?

4.3 5.5 -10 6.0 15 9.5 10.0 20 5 10 50 100 0.1 0.5 1.0 Percent incident light Figure 9-3 Vertical penetration of blue light (400 to 490 nm) in the Laurentian Great Lakes: E, Lake Erie: O, Lake Ontario; M, Lake Michigan; S, Lake Superior; and H, Lake Huron. Figures on lines refer to typical Secchi disk transparencies in meters. Orange light penetrates farthest in Eand O; green light in M and S; and blue light penetrates deepest in H. Adapted from Beeton, 1962.

Explanation / Answer

Organic substances and suspended particles present in the lake absorb and scatter the light. So the leke E is likely to be most eutophic as it has very high absobtion rate of light. Moreover it is likely to be shallowest as concentration of suspended partices is more if depth is less and hence high absobtion rate. Lake S likely to be most oligotrophic as it has less absorbtion rate along with high secchi disk transparency.

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