This article describes the effects of these two weather patterns on river flow. The flooding caused by El Nino threatens the river as a habitat because all the pollutants in the surrounding watershed are washed into the river with the help of urbanization and an abundance of impervious surfaces. During the droughts of the La Nina season, water levels are low and the ground water, with a high nitrogen concentration from fertilizers, is the main body of water flowing into the aquifer. When not in drought season, the river water would dillute this high nitrogen concentration to normal levels.
"El Nino-La Nina Events, Precipitation, Flood-Drought Events, and Their Environmental Impacts on the Suwanee River Watershed, Florida" by Hongsheng Cao in Envionmental Geosciences
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