why do we need the nitrogen cycle

Animals receive the nitrogen that they need from the consumption of plants. When plants, animals, and other organisms die, decomposers return nitrogen to the soil. What effect do humans have on the nitrogen cycle? As mentioned above, humans use fertilizers on plants to get them to grow better; and nitrogen is a major component of most fertilizers. Is this a concern? It can be. Nitrogen additions, in excessive amounts, pollute our ecosystems. This can change the functioning of the ecosystem, and the communities that are supported by it. O). This gas is a strong greenhouse gas. (It is also used to make trips to your local dentist less stressful. ) The amount of nitrogen that is transported in rivers and groundwater has increased. This can accumulate in the final destination and can lead to eutrophication of lakes, which basically kills most of the wildlife living there. Other changes we have made in the natural nitrogen cycle might include an increased loss of biodiversity, especially with plants that have adapted to the low levels of nitrogen in the soil. This also affects the animals and microbes that depend on this vegetation.
Filtration in aquariums can be mechanical (using sponges to collect debris), chemical (to absorb specific toxins) or biological (to break down fish waste).


Effective biological filtration and healthy plant growth is critical for a healthy and sustainable aquarium. Biological filtration To keep fish healthy and happy, a good quality biological filter is required to breakdown toxic aquarium waste products such as fish waste, food waste and decaying plants. This process is commonly referred to as the вnitrogen cycleв or вnitrification cycleв and refers to the establishment of beneficial bacterial colonies which break down waste products into less harmful compounds. There are three stages of the nitrogen cycle and every new aquarium must go through these three stages before biological filtration is fully functioning. The largest contributing factor to fish loss/death in aquariums is a failure to understand this process and provide the right conditions for it to occur. In a new aquarium (or new filter) there are not enough beneficial bacteria to eliminate all toxins immediately, so for a period of two to six weeks, steps need to be taken to reduce risks to fish health and welfare and to prevent fish deaths. The three stages of the nitrogen cycle Fish waste forms ammonia, which is highly toxic to most fish.


In a new aquarium ammonia levels usually begin rising by the third day after introducing fish. As nitrite-forming bacteria (nitrosomas) develop, ammonia is converted to nitrite and while the ammonia levels decrease, nitrite levels increase. Nitrite levels usually begin rising by the end of the first week after introducing fish. As nitrate-forming bacteria develop (nitrobacters), nitrite levels decrease and nitrate levels increase. When nitrates are being produced and ammonia and nitrite levels are zero, your tank is fully cycled and your biological filter is fully functioning (from 2-6 weeks). In low levels, nitrates are not highly toxic to fish. Routine partial water changes of about 10% should keep nitrate levels within a safe range. Tips for a healthy aquarium Beneficial bacteria grow on any surface in the aquarium and they are concentrated in the filter sponge/media which has a high surface area. By constantly flowing water through the filter, ammonia and nitrite are rapidly converted to nitrates, assisting in keeping tank water free of toxic levels of these compounds. You should avoid completely cleaning a tank as this will remove the beneficial bacteria.


Instead, partial water changes of approximately 10% should be performed once per week, using a gravel vacuum to remove waste and uneaten food from the substrate. At this time the sides of the tank can be wiped with an aquarium safe sponge and filter media and/or decorations can be cleaned in old tank water. Regularly test your water for ammonia, nitrite nitrate levels to ensure your biological filtration is sufficient, you are maintaining it appropriately and your aquarium is not overstocked or overfed. Your filter is ultimately only as effective as the media it contains. There are many types of biological media available on the market and it is important to select a media which has a high biological capacity. Do not add large numbers of fish to your aquarium at any one time - gradual introduction will enable the filtration bacteria to slowly adapt. that in marine/saltwater aquariums fishless cycling and using live rock to cycle the aquarium is often recommended. в If you need specific advice on how to safely cycle a tank, p lt an experienced aquarist or fish veterinarian for further advice about how to safely cycle a tank.

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