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...Pond and lake ecosystems a or ecosystem includes biotic living plants animals micro organisms as well abiotic nonliving physical chemical interactions are prime example of lentic refers to stationary relatively still water from the latin lentus which means sluggish typical has distinct zones biological communities linked structure figure below littoral zone is near shore area where sunlight penetrates all way sediment allows aquatic macrophytes grow light levels about less surface values usually define this depth level also defines euphotic layer down become too low for photosynthesizers in most lakes sunlit occurs within epilimnion however unusually transparent photosynthesis may occur thermocline into perennially cold hypolimnion western superior duluth mn summertime algal growth can persist depths at least meters while mixed only extends ultra oligotrophic tahoe ca nv so that historically extended over though its summer unfortunately inadequate management basin since led significant...