Mutual Interference Between Parasites or Predators and its Effect on Searching Efficiency

A number of experiments (Burnett 1956; Hassell & Huffaker 1969; Holling 1959; Ullyett 1949a,b, 1950) indicate that a basic assumption implicit in early population models of predator-prey and parasite-host interactions (Lotka 1925; Yolterra 1926; Nicholson & Bailey 1935) is false. This assumption requires the number of hosts parasitized (or prey attacked) to be proportional to the density of hosts and the density of parasites*. It is possible to formalize this assumption in terms of searching efflciency (E) where E is deSned by E Na (1)

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