The effect of water level in a prey-predator interactions: A nonlinear analysis study

Water level may influence local community dynamics. We examine how seasonal variations in water level affect the outcome of prey-predator interactions in Parloup Lake in the south of France. We propose a new model to describe the annual cycle of persistence by using continuation theorem of coincidence degree.

► A new model describing the interaction between predator and prey in Parloup Lake.
► Existence of periodic solution is proved.
► Seasonal variation in water level is an important factor for persitence.