NPZ-model/State-Variables.md

@@ -21,7 +21,7 @@ graph TD;
 ```
 
 [top](NPZ model)
-## Phytoplankton (Phyto)
+## Phytoplankton (Phy)
 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
@@ -35,10 +35,28 @@ graph TD;
 ## 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).
 
+```mermaid
+graph TD;
+  Phy-- ZooGrazing--> Zoo;
+  Zoo-- GrazingZoo--> Shellfish;
+  Zoo-- ZooExcretion --> DIN;
+  Zoo-- ZooMortality--> Det;
+  Zoo-- Zoofaeces--> Det;
+```
 [top](NPZ model)
 ## Detritus (Det)
 Detritus (Det) is the dead organic carbon. The unit is mmol-N m<sup>-3</sup>. Detritus is produced by mortality of zooplankton (ZooMortality) and the production of faeces by zooplankton (ZooFaeces). Shellfish can also filter detritus from the water column (GrazingDet). Finally detritus can sink to the seafloor (SinkDet) where it becomes Bot_Det .
 
+
+```mermaid
+graph TD;
+  Zoo-- ZooMortality--> Det;
+  Zoo-- Zoofaeces--> Det;
+  Det-- Mineralization --> DIN;
+  Det-- GrazingDet--> Shellfish;
+  Det-- SinkDet--> Bot_Det;
+```
+
 [top](NPZ model)
 # State variables in the bottom
 ## Microphytobenthos (MPB)