Editing Limnology (section)

==== Nitrogen ====
[[Nitrogen]] is a nutrient central for the function of aquatic ecosystems. Nitrogen is generally present as a [[gas|dissolved gas]] ([[Nitrogen gas|N<sub>2</sub>]]) in aquatic ecosystems, however due to the high energy requirement of utilising N<sub>2</sub> most organisms tend not to use it.<ref name=":3">{{Citation |last1=Dodds |first1=Walter K. |title=Nitrogen, Sulfur, Phosphorus, and Other Nutrients |date=2010 |work=Freshwater Ecology |pages=345–373 |url=https://linkinghub.elsevier.com/retrieve/pii/B9780123747242000143 |access-date=2025-04-24 |publisher=Elsevier |language=en |doi=10.1016/b978-0-12-374724-2.00014-3 |isbn=978-0-12-374724-2 |last2=Whiles |first2=Matt R.|url-access=subscription }}</ref> Therefore, most water quality studies tend to focus on [[nitrate]], [[nitrite]] and [[ammonia]] levels.<ref name="limnology book"/><ref name=":3" /> Most of these dissolved nitrogen compounds follow a seasonal pattern with greater concentrations in the [[Autumn|fall]] and [[winter]] months compared to the [[Spring (season)|spring]] and [[summer]].<ref name="limnology book"/>