NPZ-model/State-Variables.md

@@ -13,17 +13,24 @@ Dissolved inorganic nutrients (DIN) is the sum of NO<sub>2</sub>, NO<sub>3</sub>
 
 ```mermaid
 graph TD;
-  DIN -- DINuptake --> Phyto;
+  DIN -- DINuptake --> Phy;
   DIN -- DINupMPB --> MPB;
-Det -- Mineral --> DIN;
+  Det -- Mineralization --> DIN;
   Shellfish -- DINprod --> DIN;
-  Zoo -- ZooExcr --> DIN;
+  Zoo -- ZooExcretion --> DIN;
 ```
 
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 ## Phytoplankton (Phyto)
 Phytoplankton is composed of microalgae in the water column that are transported by tidal currents. The unit of phytoplankton is mmol-N m<sup>-3</sup>. Phytoplankton increases by primary production (DINuptake). Phytoplankton is consumed by zooplankton (ZooGrazing) and shellfish (GrazingPhy). Also phytoplankton can sink to the bottom (SinkPhy), where it becomes part of the bottom detritus (Bot_Det).
 
+```mermaid
+graph TD;
+  DIN -- DINuptake --> Phy;
+  Phy-- GrazingPhy--> Shellfish;
+  Phy-- SinkPhy--> Bot_Det;
+  Phy-- ZooGrazing--> Zoo;
+```
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 ## Zooplankton (Zoo)
 Zooplankton (Zoo) are small animals (e.g. crustaceans, shellfish larvae) that live in the water column and are transported by the tidal currents. The unit is mmol-N m<sup>-3</sup>. Zooplankton consumes phytoplankton (ZooGrazing). A fraction of the nitrogen that is grazed is lost as feaces (ZooFaeces) and the rest will result in an increase of the zooplankton biomass. Zooplankton can also be consumed by shellfish (GrazingZoo). When the zooplankton dies (ZooMortality) it will become detritus (Det). Finally, zooplankton also produces dissolved inorganic nitrogen by respiration (ZooExcretion).