Decomposers react on organic matter.They utilize Oxygen to breakdown organic materials.So Oxygen level drops.
Fast-moving stream ecosystems tend to have high oxygen levels, cool temperatures, and a diverse array of aquatic species adapted to the swift currents. These streams often have rocky bottoms with well-oxygenated water that supports a variety of fish, invertebrates, and plant life. The fast flow of water helps maintain water quality by preventing the accumulation of pollutants and sediment.
Excess nitrates in a stream can lead to eutrophication, causing algal blooms that block sunlight and deplete oxygen when they decay. This can harm aquatic organisms, such as fish, by reducing oxygen levels and disrupting the food chain. High nitrate levels can also be toxic to some species of organisms in the stream.
Noo. Rainbow trout can not live in pond water. That depends on the temp., oxygen level, and some type of fresh water. like a water change, or a small stream. a fountain, waterfall, and the stream will help with oxygen levels.
Oxygen enters the blood stream through the air sacs in you lungs.
The oxygen content of a river or stream is likely to be highest at the source. The source of the river or stream is where it originates.
Nitrate pollution of a stream can result in eutrophication, where excess nutrients lead to excessive plant and algae growth. This can deplete oxygen levels in the water, causing harm to aquatic organisms and disrupting the ecosystem balance. Additionally, nitrate pollution can contaminate drinking water sources and pose health risks to humans.
Organisms in streams need oxygen to live when lacking dissolved oxygen it will kill these organisms. edit: unless the organisms in the stream are photosynthetic, in which case they will increase the oxygen levels. however, by far, most organisms in a stream are not photosynthetic and oxygenation occurs solely through aeration and surface area dissolving from the air. so, to answer the question, organisms (most organisms which aren't plant-based photosynthetic organisms) decrease the amount of oxygen in a stream. edit: a flowing stream has turbulence which helps aerate the water, increasing dissolved oxygen. In contrast, stagnant water tends to be low in dissolved oxygen, except near the surface. Multicellular animals (like fish) need a good supply of dissolved oxygen to thrive.
In air breathing animals, oxygen enters the blood stream through the alveoli, tiny sacs in the lungs. In water breathing animals oxygen enters the blood stream through the gills.
When soil is washed into a stream, it can cause water pollution by clouding the water, reducing water clarity, and affecting aquatic life that depend on clean water. The excess sediment in the stream can also impact the health of the stream ecosystem by reducing oxygen levels and altering habitats for aquatic species.
there is more dissolved oxygen present in a stream because the movement and the bubbling of the air allows more oxygen to be ingested
GeVy
There are three OD's used Total Oxygen Demand (TOD), Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD) They all measure the amount of oxygen that would be required to consume organic material in the water, BOD is the lowest (usually) as it measures demand from microbes eating easily digested organics (sugars etc), COD measures the demand from all other organics (alcohols etc) measured by digesting the material in strong chemical oxidants, and TOD is the total of the two. Oxygen demand is important to know in waste handling as reducing the oxygen in receiving stream can harm fish and other aquatic life.