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Eutrophication is a common phenomenon in coastal waters, where nitrogenous sources are the main culprit. [21] In coastal waters, nitrogen is commonly the key limiting nutrient of marine waters (unlike the freshwater systems where phosphorus is often the limiting nutrient).
Lake ecosystems can be divided into zones. One common system divides lakes into three zones. The first, the littoral zone, is the shallow zone near the shore. [5] This is where rooted wetland plants occur. The offshore is divided into two further zones, an open water zone and a deep water zone.
The most notable effects of eutrophication are vegetal blooms, sometimes toxic, loss of biodiversity and anoxia, which can lead to the massive death of aquatic organisms. [8] Due to the hypoxic conditions present in dead zones, marine life within these areas tends to be scarce.
Nutrient pollution, a form of water pollution, refers to contamination by excessive inputs of nutrients.It is a primary cause of eutrophication of surface waters (lakes, rivers and coastal waters), in which excess nutrients, usually nitrogen or phosphorus, stimulate algal growth. [1]
In certain locations there are links to particular drivers like nutrients, but HABs have also been occurring since before humans started to affect the environment. HABs are induced by eutrophication, which is an overabundance of nutrients in the water. The two most common nutrients are fixed nitrogen (nitrates, ammonia, and urea) and phosphate. [6]
Then a gray fox, the most common of Arizona’s three fox species, sneaks in for a drink. The final animal on film is a bat. Arizona has 28 bat species, all of which are protected.
Depleted oxygen levels are the most common cause of fish kills. In this way eutrophication can have devastating consequences for the health of benthic life. Fish kills may result from a variety of causes. Of known causes, fish kills are most frequently caused by pollution from agricultural runoff or biotoxins.
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