Titlebook: Ecological Stability; M. B. Usher,M. H. Williamson Book 1974 Springer Science+Business Media Dordrecht 1974 biology.ecology.nature conserv

親密

種屬關系

The analysis of discrete time cyclesthe Mackenzie River district, and showed that the population had a statistically significant cycle, averaging a little less than ten years from peak to peak. Other Canadian populations of lynx and other animals also exhibit a ten-year cycle. In Labrador, and elsewhere, there has been a well marked f

吝嗇性

capsule

Mathematical models of host-helminth parasite interactionskground of the author. Biologists may argue that a stable population is one that has persisted in a given habitat for a long period of time and has neither become extinct nor reached plague proportions. In this framework a precise definition of the time span in which the population has persisted is

APRON

Stability in host-parasite systemsmining parasite numbers. Much of the theoretical work on population ecology has dealt with two interacting populations and so we may hope that theory and observation may draw closer together in understanding the host-parasite system. However, the superficially simple host-parasite relation is often

Vertebra

How the behaviour of parasites and predators promotes population stabilityific population regulation. The introduction of a theoretical parasite or predator into a stable host or prey model based, for example, on the logistic equation can introduce either temporary or permanent instability (Maynard-Smith, 1968). In this paper the arguments for parasites will in most cases

破譯

The kinetics of polyphagyMacArthur, 1955; Watt, 1965). The extent to which each species feeds upon each other, if at all, will be important in determining the character of the system. Fundamental to elucidating these links and the way in which they may vary is the understanding of the functional response (Solomon, 1949) of

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hemorrhage

Food web linkage complexity and stability in a model ecosystem models tend to be unstable. As May (1971, 1973), has pointed out, such an argument is only valid if it may be shown that more complex ecosystem models, involving more species with a greater degree of food web linkage, exhibit greater stability than simpler ones. Recent studies of ecosystem models (

Dysarthria

Stability of plankton ecosystemsiations with time. Yet there are schools of thought which maintain that the spatial heterogeneity of the physical environment which produces patterns of patchiness in these populations can be as important a factor in ensuring long-term survival of a species (MacArthur and Wilson, 1967; Andrewartha a