Predator-Prey Interaction in Structured Models Glenn Ledder J. David Logan University of Nebraska-Lincoln

Simple Holling type II dynamics

Simple Holling Type II Dynamics Time is split between searching and feeding U – prey density R(U) – overall predation rate s – search speed h – handling time = · · food total t search t total t space search t food space search t total t feed t total t = 1 –

Simple Holling Type III Dynamics Time is split between searching and feeding Searching is density-dependent U – prey density R(U) – overall predation rate s – maximum search speed h – handling time

Simple Holling Type II Dynamics Time is split between searching and feeding U – prey density R(U) – overall predation rate s – search speed h – handling time

Holling type II—Multiple Prey Time is split between searching and feeding U i – prey densities R i (U i ) – overall predation rates s i – search speeds h i – handling times

Full Model – 1 Predator Class U i – prey densities R i (U i ) – overall predation rates s i – search speeds h i – handling times c i -- conversion G – per capita growth M – per capita mortality

Multiple Prey and Predators U i – prey densities P k – predator densities s ik – search speeds h ik – handling times c ik – conversion efficiencies

Continuous Structure x – prey class y – predator class u(x, t) – prey density p(y, t) – predator density s(x, y) – search speed h(x, y) – handling time I(y) – set of prey consumed by predators of size y K(x) – set of predators capable of consuming prey of size x dF(x, y, t) – predation of (y, y+dy) on (x, x+dx)