Editing Modelling biological systems (section)

===Ecological models===
{{Main|Ecosystem model}}
Ecosystem models are [[mathematics|mathematical]] representations of [[ecosystem]]s.  Typically they simplify complex [[food web|foodwebs]] down to their major components or [[trophic level]]s, and quantify these as either numbers of [[organism]]s, [[biomass]] or the [[inventory]]/[[concentration]] of some pertinent [[chemical element]] (for instance, [[carbon]] or a [[nutrient]] [[chemical species|species]] such as [[nitrogen]] or [[phosphorus]]).