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Download Advances in Ecological Research, Vol. 9 by A. MacFadyen (Ed.) PDF

By A. MacFadyen (Ed.)

Advances in Ecological examine , first released in 1962, is one in every of educational Press's so much winning and prestigious sequence. In 1999, the Institute for clinical info published figures displaying that the serial has an impression issue of 9.6, with a part lifetime of 10.0 years, putting it 1st within the hugely aggressive type of Ecology. The Editors have continuously striven to supply quite a lot of most reliable papers on all facets of ecology, comparable to animal/plant, physiology/population/community, panorama and environment ecology. Eclectic volumes within the serial are supplemented through thematic volumes on such themes as Estuaries and historic Lakes . Now edited through Dr Hal Caswell, of Woods gap Oceanographic establishment, Advances in Ecological study maintains to put up topical and demanding stories, analyzing ecology as extensively as some time past, to incorporate all fabric that contributes to our figuring out of the sector.

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Extra resources for Advances in Ecological Research, Vol. 9

Sample text

He concludes that, under these conditions, the multi-patch extension will not be stable unless the singlepatch version is, and may not be even then; and he arrives at similar conclusions for a Lotka-Volterra system of difference equations. However, the strength of his assumptions, and those of St Amant, suggest that the whole question of the relationship between spatial heterogeneity and stability is still rather open. The assumption that PREDATION AND POPULATION STABILITY 25 a, m and Q are the same in all patches is particularly serious since it removes the machinery that keeps different patches oscillating at different frequencies.

Degree of prey patchiness. 4. Prey patchiness as a function of prey density. Although we include in this analysis ( a )the time taken to search an empty patch and (b) the relationship between prey density in a patch and time spent in the patch, we do not discuss the effects of variation in these variables, though such variation no doubt affects the stabilizing properties of the overall functional response. c. A MODEL OF PREDATOR BEHAVIOUR, A N D ITS CONSEQUENCES There are three basic assumptions to be made for a model of the kind we want to investigate here.

Smith (1972) noted that prey will vary in the ease with which they are captured, and that under some circumstances this might be related to prey density. This would operate somewhat like a refuge, with a variable fraction being difficult to find and catch. Where, as Smith suggests, the fraction increases as prey density declines (because the remaining prey are difficult to get), this will have a stabilizing effect on the interaction. c. O N E CLASS O F P R E Y I S I N V U L N E R A B L E The situation where a single class of prey is invulnerable (Section 11) has not been modelled but is mathematically somewhat analogous to the presence of a refuge.

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