Limnocorrals are enclosures placed in natural lakes. Multiple corrals in a lake have been used to study the fate and effects of pesticides on the populations enclosed in the limnocorrals. Unlike mesocosms that require a period of time for the development of resident communities of organisms, limnocorrals take advantage of the already developed communities in the lake. Randomly chosen limnocorrals are assigned to a control group while others are assigned to various treatment groups. Changes in the structure and/or function of the assemblages of organisms in the limnocorrals are measured, as are the overall effects through the use of multivariate statistics. In some cases organisms in cages have been added to limnocorrals and direct effects on those organisms can also be determined.
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