The utilization of Chara in lake management

by Steve Weinsier

Man’s increased concern with the aquatic environment has resulted in a strong need for a new means of managing aquatic vegetation. One concept of management is to control undesirable plants through the use of environmentally safe, selective aquatic herbicides while encouraging the growth of desirable plants. If necessary, beneficial plants can be introduced.

Desirable aquatic plants are best described as those which tend to have the following characteristics:
  • They absorb large quantities of nutrient from the aquatic environment.
  • They form good fish habitat.
  • They are unobtrusive in their growth patterns.
  • They are relatively simple to control.
     
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    Undesirable plants are those which tend to grow rampantly, dominate native plant life, and are generally troublesome to the water user.

    One of the best examples of a "good" plant is bottom growing Chara. It is a strong nutrient absorber which grow to a maximum height of around eight inches, and provides excellent fish habitat. Chara thrives in all types of water. The plants are found both in shallow water and to depths of 20 feet, depending on water clarity. The plants can thrive in ponds that are seasonally dry part of the year.

    Water management programs involving biological (utilizing Chara) and chemical controls offer several advantages. First, once established, Chara crowds out undesirable weeds, such as hydrilla. This results in a minimum of unwanted weed regrowth and minimizes maintenance costs. Second, nutrient removal by Chara hinders growth of planktonic algae, improving water clarity. Third, Chara aids in maintaining an environmental balance and provides excellent habitat for fish. Fourth, Chara does not interfere with the recreational use of waterways. It’s fragile stems do not snarl propellers or pose the threat of entanglement to swimmers. Finally, Chara is readily controlled by environmentally safe herbicides.

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