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Science Daily - Algal Bloom
Algal blooms may occur in freshwater as well as marine environments.
Wikipedia - Algal Bloom (Bold emphasis by me).
Freshwater algal blooms are the result of an excess of nutrients, particularly phosphorus. The excess of nutrients may originate from fertilizers that are applied to land for agricultural or recreational purposes, these nutrients can then enter watersheds through water runoff. Excess carbon and nitrogen have also been suspected as causes.
Wikipedia - Fertilizer (Bold emphasis by me).
Fertilizers are applied to promote plant growth; the main nutrients present in fertilizer are nitrogen, phosphorus, and potassium (the 'macronutrients') and other nutrients ('micronutrients') are added in smaller amounts. Fertilizers are usually directly applied to soil, and can also be sprayed on leaves as a foliar feeding.
CNN Article (Bold emphasis by me).
"Yeah, we lost 135,000 acres of farm land here in Missouri," said Sikeston, Missouri, resident Patricia Mobely, who recently fled the drought and firestorms of Texas for what she thought would be a more peaceful life in the Midwest. "But how much more would we have lost if we hadn't done it?"
Bacteria Hazards of Swimming in Freshwater Lakes and Ponds (Bold Emphasis by me).
How did bacteria get into the lake or pond? There are a number of ways that bacteria can get into the water. Domesticated animals and wildlife feces contain millions of bacteria . Periods of significant rainfall will wash bacteria from the feces and those in the soil into ponds and lakes. Additional sources of contamination can come from sewage spills, animal waste, and from infected swimmers. A small amount of feces can quickly contaminate a recreational body of water.
Wikipedia - Cow Dung (Bold emphasis by me).
Cow dung (usually combined with soiled bedding and urine) is often used as manure (agricultural fertilizer).
The Gulf of Mexico Dead Zone (As if the GoM hasn't suffered enough)!
Hypoxic conditions arise when dissolved oxygen levels in the water fall below two milligrams per liter of water, too low to sustain animal life in the bottom strata of the ocean. The Dead Zone forms each spring as the Mississippi and Atchafalaya Rivers empty into the Gulf, bringing nutrient rich waters that form a layer of fresh water above the existing salt water. It lasts until late August or September when it is broken up by hurricanes or tropical storms. The nutrients provide favorable conditions for excessive growth of algae that utilize the water’s oxygen supply for respiration and when decomposing.