Ecological Versatility and Community Ecology - download pdf or read online

By Ralph C. MacNally

ISBN-10: 052111926X

ISBN-13: 9780521119269

There are mounting issues that the administration of our usual worldwide history is failing to arrest the speedy extinction of huge numbers of "specialized" species, specially within the tropics. This booklet is set specialization and generalization within the use of assets and habitats. the writer employs a wide ecological point of view to handle 3 major questions: how ecologists research version in source and habitat use and what we research from those stories; how good latest conception bills for observations and what the typical threads between disciplines are; and at last, what the connection among source and habitat use is. this can be the 1st booklet to supply a entire research of ecological versatility and as such, should be of serious curiosity to scholars and researchers in ecology and environmental biology.

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Example text

Following Hill (1973), Petraitis (1981) noted that many existing indices of niche breadth (Levins 1968, Schoener 1974b, Hurlbert 1978, Petraitis 1979) were members of the same family of mathematical functions. These statistics differ in the relative degree to which utilization and availabilities are weighted within the summary index, and the influence that rarer and more common resource categories are assigned (see also Colwell and Futuyma 1971 and Hanski 1978). The general function is: *(M=&(W<)'~ 1 ) 1/(1 ~'Uceo,i,...

There has been much attention paid to modelling resource use in populations, especially by using mathematical analysis. , asymptotic stability, invasibility). The use of these criteria is questionable (see Chapter 7) so that in Chapter 6, an alternative tack is employed. Population dynamics and temporal changes in the patterns of resource use in populations displaying different exploitation strategies are modelled, in a way not too dissimilar to that developed by J. W. Glasser (Glasser 1982, Glasser and Price 1982).

Macrohabitats are more uniform in character than habitats, but still more heterogeneous than microhabitats (Morris 1987a). , MacArthur and Pianka 1966, Emlen 1973, Holbrook and Schmitt 1988). Others think of microhabitats as providers of shelter or refuge in their own right, which thereby actually increase fitness (Dobkin 1985, McEvoy 1986). In the first case, the microhabitat would be similar to a habitat in being a battery of resources; in the latter view, the microhabitat is a true resource.

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Ecological Versatility and Community Ecology by Ralph C. MacNally


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