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  2. Ammonia pollution - Wikipedia

    en.wikipedia.org/wiki/Ammonia_pollution

    Gaseous ammonia emissions enter Earth’s soil and water through both wet and dry deposition. Aqueous ammonia, another form of the compound, may seep directly into the ground or flow into aquatic ecosystems. Both terrestrial and aquatic ammonia pollution decrease biodiversity mainly through the process of nitrification.

  3. Soil contamination - Wikipedia

    en.wikipedia.org/wiki/Soil_contamination

    As well as increased concentration via the food chain, it is known to enter via permeable membranes, so fish get it through their gills. As it has low water solubility, it tends to stay at the water surface, so organisms that live there are most affected. DDT found in fish that formed part of the human food chain caused concern, but the levels ...

  4. Urea cycle - Wikipedia

    en.wikipedia.org/wiki/Urea_cycle

    The conversion from ammonia to urea happens in five main steps. The first is needed for ammonia to enter the cycle and the following four are all a part of the cycle itself. To enter the cycle, ammonia is converted to carbamoyl phosphate. The urea cycle consists of four enzymatic reactions: one mitochondrial and three cytosolic.

  5. Nitrogen assimilation - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_assimilation

    This influences microbial activities like the inter-conversion of various nitrogen species, the release of ammonia from organic matter in the soil and the fixation of nitrogen by non-nodule-forming bacteria. Ammonium ions are absorbed by the plant via ammonia transporters. Nitrate is taken up by several nitrate transporters that use a proton ...

  6. Food chain - Wikipedia

    en.wikipedia.org/wiki/Food_chain

    Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak which eat crustaceans.. A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as earthworms and woodlice ...

  7. River ecosystem - Wikipedia

    en.wikipedia.org/wiki/River_ecosystem

    Algae contributes to a lot of the energy and nutrients at the base of the food chain along with terrestrial litter-fall that enters the stream or river. [34] Production of organic compounds like carbon is what gets transferred up the food chain. Primary producers are consumed by herbivorous invertebrates that act as the primary consumers ...

  8. Nutrient cycling in the Columbia River Basin - Wikipedia

    en.wikipedia.org/wiki/Nutrient_cycling_in_the...

    Map of the Columbia Basin. The Columbia River basin is a major watershed and the largest river in the Pacific Northwest region of North America.Extending from southern British Columbia to northern Nevada, the watershed includes seven American states and two Canadian provinces and drains an area of about 260,000 square miles.

  9. Microbial food web - Wikipedia

    en.wikipedia.org/wiki/Microbial_food_web

    The activities of microbial communities can be disturbed by pollutants like pesticides and heavy metals. Microbial growth and dispersal are impacted by temperature and precipitation changes brought about by climate change. The entire aquatic food chain may be impacted by eutrophication, which is brought on by nutrient runoff from cities and farms.

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