This paper studies the existence and multiplicity of periodic orbits a stage-structured predator-prey model with Beddington-DeAngelis functional response. We derive an criterion orbit in terms inequalities system's nine parameters prove that system admits at least two limit cycles or three via subcritical Hopf bifurcation generalized theory hypersurface theory. also each one-parameter possesses...

Sensitivity analysis of structured populations is a useful tool in population ecology. Historically, methodological development of sensitivity analysis has focused on the sensitivity of eigenvalues in linear matrix models, and on single populations. More recently there have been extensions to the sensitivity of nonlinear models, and to communities of interacting populations. Here we derive a fu...