Not all algal blooms are harmful, some can actually be beneficial. Therefore, it is important to control algae growth for a healthy ecosystem. Oxygen depletion has two algal-bloom-related causes: respiration and decomposition. Harmful algal blooms often make the water look like pea soup, or green or blue paint. Algae and cyanobacteria consume oxygen at night (respiration) when there is not light for photosynthesis 44 . Algal blooms and oxygen depletion. But, when blue-green algae die, they decompose by a process that uses cellular respiration, which uses up oxygen. Severe blooms can completely deplete oxygen and cause dramatic fish kills. Blooms can block light to organisms lower in the water column, or even clog or harm fish gills. At night, no photosynthesis takes place, so algae stops taking in carbon dioxide from water and goes into a respiratory stage 1.During this respiratory stage, algae consume oxygen that was produced during photosynthesis and release carbon dioxide into the water 1.This increased production of carbon dioxide decreases the pH levels in the water at night. In eutrophic lakes, algae are starved for light. When algae don’t have enough light they stop producing oxygen and in turn begin consuming oxygen. When algae receive enough sunlight, they produce oxygen through photosynthesis and release it in the water. As algae begins to form, it blocks sunlight from entering the bottom of ponds, lakes and rivers. 2. First, to clarify, blue-green algae are actually a type of bacteria, they are classed in the phylum “Cyanobacteria.” Cyanobacteria (that is, blue-green algae) obtain their energy from photosynthesis, which does create oxygen. Blooms of cyanobacteria can become so thick that they block sunlight at the surface of the lake. Since most fish, crabs, mollusks, and other aquatic animals depend on oxygen as much as land-based animals, the end result of eutrophication and algal blooms is the creation of an area where … It is not safe to drink: Some lakes supply drinking water for millions of people. This lack of oxygen can lead to a “dead zone,” or an area where aquatic plants and animals cannot survive. An algal bloom or algae bloom is a rapid increase or accumulation in the population of algae in freshwater or marine water systems, and is often recognized by the discoloration in the water from their pigments. These so-called algal blooms can lead to a depletion of oxygen in the water, release of toxins and taste and odor problems. A bloom does not have to produce toxins in order to be harmful to the environment. As more nutrients drain into the water, eutrophication repeats in a vicious algal bloom cycle and releases more nutrients in the water.. The term algae encompasses many types of aquatic photosynthetic organisms, both macroscopic, multicellular organisms like seaweed and microscopic, unicellular organisms like … The result is the depletion of oxygen in the water, a condition known as hypoxia. It creates dead zones: As algae blooms, it can deplete the water of its natural oxygen. The phenomena of "algae blooms", when the population of algae … PH Effects at Night. You might also see a layer of algae in the form of a mat or foam floating on the surface. Outbreaks of algae have killed up to a million fish in the Murray Darling Basin over the last two weeks. Without treatment, the algae will grow more every year, resulting in an unbalanced ecosystem. Moreover, when the large blooms of algae begin to die, bacterial decomposers further deplete the levels of oxygen. 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