Use of sensitivity and comparative analyses in constructing plausible trophic mass-balance models of a data-limited marine ecosystem - The KwaZulu-Natal Bight, South Africa

► Plausible ecosystem models can be constructed using local and non-local data. ► Models showed sensitivity to non-local apex predator data due to top-down balancing. ► Models reproduce known differences in functioning with a Southern Benguela model. ► Models described an ecosystem reliant on import and cycling of riverine detritus.