The problem of the possibility of recovering the time-dependent state of a whole population system from the observation of certain components has been studied in earlier publications, in terms of the observability concept of mathematical systems theory. In the present note a method is proposed for effectively calculating the state process. For an illustration an observer system for a simple food web is numerically constructed. © 2007 Elsevier Ltd. All rights reserved.
López, I., Gámez, M., & Molnár, S. (2007). Observability and observers in a food web. Applied Mathematics Letters, 20(8), 951–957. https://doi.org/10.1016/j.aml.2006.09.007