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B) Water in Oligotrophic lakes often is deep, clear, nutrient poor, low in nitrogen and phosphorous levels. Its primary productivity is not great. Oligotrophic waters have a high species diversity. Oligotrophic lakes are oxygen rich. Eutrophic lakes are high in nitrogen and phosphorous. The water in Eutrophic lakes typically is shallow, nutrient rich, and rather high in primary productivity. In Eutrophic lakes the oxygen levels constantly fluctuate from high to low. Biodiversity in Eutrophic waters is low, but plankton counts are high. These condition develop naturally as sediments gradually accumulate in the lake basin. The water becomes less deep and less transparent, compared with water in Oligotrophic lakes, and phytoplankton dominate aquatic communities. More sediment usually accumulates, and the final successional stage is a filled-in basin. The appearance of phytoplanktons depends on the availability of nutrients, degree of stratification and incidence of grazing. The phytoplankton of an oligotrophic lake is likely to be of small organisms with high surface to volume ratios. Eutrophic waters may be able to sustain greater proportions of larger organisms.
Approximate Word count = 676
Approximate Pages = 2.7
(250 words per page double spaced)
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