Like other reservoirs (Harris & Baxter,
1996; Calijuri et al., 2002), meteorological
disturbances such as rainfalls also
play a relevant role in the NT2 Reservoir
dynamic of phytoplankton biomass.
Therefore, its decline observed in July
might be triggered by the strong rainfalls
and the increase of reservoir water
level. However, the unstable stratification
period can lead to a diffusion of
nutrients from impounded soils to upper
layers while water temperature remains
high. At the end of the WW season,
higher nutrient concentrations might
stimulate theNT2Reservoir algal growth.
This nutrient enrichment into the NT2
Reservoir can be expected during the
rainfalls period due to soil leaching from
the drawdown area and the tributaries
of the catchment area (Oishi, 1996;
Reynolds, 2006).Consequently, a
second peak might appear at the end of
WW season responding probably to
NO3
- input. These peaks were mainly
composed by Diatoms species sensitive
to stratification. They did not maintain
their growth due to the mixing
phase at the end of CD season.
Like other reservoirs (Harris & Baxter,1996; Calijuri et al., 2002), meteorologicaldisturbances such as rainfalls alsoplay a relevant role in the NT2 Reservoirdynamic of phytoplankton biomass.Therefore, its decline observed in Julymight be triggered by the strong rainfallsand the increase of reservoir waterlevel. However, the unstable stratificationperiod can lead to a diffusion ofnutrients from impounded soils to upperlayers while water temperature remainshigh. At the end of the WW season,higher nutrient concentrations mightstimulate theNT2Reservoir algal growth.This nutrient enrichment into the NT2Reservoir can be expected during therainfalls period due to soil leaching fromthe drawdown area and the tributariesof the catchment area (Oishi, 1996;Reynolds, 2006).Consequently, asecond peak might appear at the end ofWW season responding probably toNO3- input. These peaks were mainlycomposed by Diatoms species sensitiveto stratification. They did not maintaintheir growth due to the mixingphase at the end of CD season.
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