We have primary producers algae and photosynthetic bacteria. Then there are two heterotrophs brine shrimp and larvae of a brine fly that eat the algae and live in the salty water. Five species of birds feed off the brine shrimp An unknown number of bacteria act to decompose the fecal matter and dead bodies of the other organisms, returning the nutrients to the water. The real world trophic levels can be very complex. The life cycle.
Energy is derived from the sun via plants .
This in turn, supplies the energy for all life forms. The fungi decompose the others and return the nutrients to the Earth for the cycle to begin again. The food web is self regulating. It is a system of negative feedback . More plants mean more primary consumers.