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reduction in nutrient loading would result in oligotrophy.
According to different classifications [32, 33] the total phosphorus and total nitrogen values from Lake Paajarvi and Lake Paijanne reflect mainly oligotrophy and mesotrophy.
In lake succession, productivity and photosynthetic efficiency increase from oligotrophy to a prolonged eutrophic stage-equilibrium and decline with lake senescence, rising again in the terrestrial stages of hydrarch succession.
Species found in the caatinga are all strongly tolerant of oligotrophy, but we do not know whether species differ in their abilities to persist when nitrogen supply reaches its lowest extremes.
The relative low metabolic rates and photosynthetic efficiency can be a result of some environmental features, such as oligotrophy status, P--and light limitation, as well as low photosynthetic capacity of Cyanobacteria.
The phytoplankton structure with dominance of the FGs Y and Lo during most of the study period, characterized the oligotrophy conditions, the pattern of circulation and light availability of the reservoir.
The low species-level biodiversity found there is attributed to oligotrophy associated with these southern latitudes (Campos, 1984; Soto & Zuniga, 1991; De los RiosEscalante, 2010).
Species indicating oligotrophy such as Gastropus stylifer (in lakes Svente and Geranimova) and Ploesoma hudsoni (in lakes Dridzis and Geranimova) have disappeared.
Other measures that prevent oligotrophy, hypereutrophy, excessive phytoplankton bloom, establishment and proliferation of toxic cyanobacteria, run-off of organic wastes and high dissolved salts were also been used to maintain the water quality and this made the phytoplankton assemblage and productivity of the reservoir to be high.
The Mediterranean Sea is a semi-enclosed area with pronounced oligotrophy in the surface waters due to small amounts of nutrient discharge from the land.
The degree of eutrophy or oligotrophy in an area also determines its algal population, because in eutrophic situations fast-growing opportunistic seaweeds eliminate the more mature populations of larger and usually slower-growing seaweeds.
Increasing RP as N:P ratios increase may be an indication of increasing oligotrophy in those systems.
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