oligotrophic

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oligotrophic Applied to waters or soils that are poor in nutrients and with low primary productivity. Typically, oligotrophic lakes are deep, with the hypolimnion much more extensive than the epilimnion. The low nutrient content means that plankton blooms are rare and littoral plants are scarce. The low organic content means that dissolved oxygen levels are high. By comparison with eutrophic lakes, oligotrophic lakes are considered geologically young, or little modified by weathering and erosion products.

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