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THE NATURAL CONTROL OF INSECTS IN PINE WOODS II. CONDITIONS FOR DAMPING OF NICHOLSON OSCILLATIONS IN PARASITE-HOST SYSTEMS by L. TINBERGEN AND H. KLOMP I. INTRODUCTION It has been shown in part I of this study that the intensity of predation by birds on insects in pine woods depends on the population density of the prey. However, the relationship between the two is not such as to guarantee stability of the prey populations. At low density of a prey, it is true, the predators will not acquire a searching image for that species, and thus their grip on its population will be loosened. This may help the prey to return to more normal levels. However, at abnormally high prey densities, the predators become increasingly reluctant to take that prey. Neither can the predator population increase in numbers so rapidly as to put a check on the escaping prey population. Hence, in a system consisting only of such prey and such a predator, control of the prey density would be far less adequate than is the case in nature. Evidently, other factors take a share in regulating the prey population in nature. We shall consider some of these factors,
Archives Néerlandaises de Zoologie (in 1967 continued as Netherlands Journal of Zoology) – Brill
Published: Jan 1, 1960
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