Abstract
Results of comparative studies of host and ectoparasite populations indicate indirectly that spacing between individual hosts is an important factor governing the density of the ectoparasite populations. Rat-flea populations have been reported to be roughly proportional to the density of their host populations (Eskey, 1930). Declining populations of snowshoe hares, Lepus americanus, have been shown to induce declines in populations of the bird and rabbit tick, Haemaphysalis leporispalustris, (Green, Evans, and Larson, 1943). The decline in hare populations probably reduces overlapping of activity, thus leaving increasing proportions of ticks without hosts.
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