The characteristics of temperate impoundments cannot be applied directly to deep impoundments in tropical latitudes. Stratification behavior is often quite different in the tropics, including a high degree of polymixis. On the other hand, small temperature differences at elevated temperatures can be sufficient to create strong density gradients, or pycnoclines, often with sharp gradients of oxygen concentration and redox potential. A feature of many mesotrophic and eutrophic tropical impoundments is overgrowth by floating macrophytes.
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