The Relationship Between Water Depth and Sedimentary Pigment Concentration in Two Holomictic Berkshire Lakes

摘要

The concentration of chlorophyll derivatives and total carotenoids in the sediment of lakes studied to date is directly related to the depth of water overlying the sediment. This relationship is roughly linear until relatively deep water is reached where there is a tendency for sedimentary pigment concentration to increase more slowly or remain relatively stable with further increases in water depth. In each of two holomictic lakes, pigment profiles taken from all water depths below and including the littoriprofundal zone were similar in their major features, despite the influence of water depth on overall pigment concentration. The relationship between water depth and sedimentary pigment concentration is probably indirect. Although several explanations are possible it seems most probable that water depth controls turbulence and hence resuspension of the sediment.