English: Schematic of BESTNPZ (Bering Ecosystem Study Nutrient-Phytoplankton-Zooplankton), a regional ocean model use to simulate lower trophic level processes throughout the Bering Sea.
Circular nodes represent state variables (gold indicates nutrient, green indicates producer, blue indicates consumer, brown indicates detritus). Edges (lines) represent fluxes between state variables and curve clockwise from source node to sink node. Edge colors indicate process type: green indicates primary production, blue indicates grazing and predation, brown indicates egestion, gold indicates respiration, red indicates remineralization, pink indicates nitrification, orange indicates non-predatory mortality, tan indicates excretion, purple indicates convective exchange, gray indicates sinking to seafloor, and navy indicates freezing/melting of ice.