First we had to research ecosystems and real-world examples of species being removed from ecosystems already. We came across several interesting concepts which had an impact on our installation idea.
'Biomass' is a measurement of how many of a particular species are regularly observed in its natural environment. It is most easily mapped with Eco-pyramid diagrams -which display producer or provider species (plants) at the bottom with a larger biomass, and 'apex predators' at the top with a smaller biomass. If it were any other way, an ecosystem would be forced to collapse as not enough sources of food would be available to sustain the food chain or web.
Biomass pyramid example
See this link for a detailed article on keystone species: