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

植物學(xué)

立即

Switching in invertebrate predatorsThis paper deals with certain aspects of the behaviour of invertebrate predators that are potentially important in influencing the structure and stability of their prey populations. It is therefore concerned with a small facet of the broad set of problems embraced by the term ‘ecological stability’.

哀悼

主動(dòng)

Entwickelungsfolge der Zellensystemeples are those of Kierstead and Slobodkin (1953) in which the size of a plankton patch is determined by the magnitude of the turbulent diffusion, and of Margalef (1967) in which the flushing rate of an estuary plays a similar role. In both these models the potential increase in plankton populations

Hormones

calorie

https://doi.org/10.1007/978-3-662-26711-0mining 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

玩忽職守

https://doi.org/10.1007/978-3-662-30041-1ific 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

大洪水

consolidate

,Herstellung von Feuchtpr?paraten,pon, and consequently being dependent upon, the other, both populations tend to fluctuate. While the maxima of the predator population occur somewhat after those of the prey, the intervals between maxima are approximately the same for both populations. Lotka (1920) and Volterra (1931) independently

CHAFE

Die Konservierung des Rotbuchenholzes, 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 (