The Ecology of Bird Communities. Volume 2: Processes and by John A. Wiens PDF

Environmental Studies

By John A. Wiens

ISBN-10: 0521426359

ISBN-13: 9780521426350

The 2 volumes of John Wiens' Ecology of chicken groups have purposes and significance to the entire box of ecology. The books include an in depth synthesis of our present realizing of the styles of business enterprise of chook groups and of the criteria which may make certain them, drawing from stories from world wide. by way of emphasizing how right good judgment and strategies have or haven't been and the way various viewpoints have built traditionally and feature resulted in controversy, the scope of those books are prolonged a ways past the research of birds. procedures and adaptations discusses the best way fowl group styles were interpreted. This moment quantity examines how the complexity and variability of normal environments may well impression efforts to parent and comprehend the character of those groups. Graduate scholars and execs in avian biology and ecology will locate those volumes a worthwhile stimulus and consultant to destiny box stories and idea improvement.

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Additional resources for The Ecology of Bird Communities. Volume 2: Processes and variations

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This is more likely if the zone of contact does not correspond with a zone of habitat change, and both Diamond and Terborgh claim to have documented numerous such patterns among birds on mountain slopes in the tropics (see Volume 1, Chapter 8). In neither set of studies were habitats actually measured; rather, the investigators used subjective evaluations to record changes between a few major habitat zones. Both Mountainspring and Scott (1985; Scott et al. 1986) and Sherry and Holmes (1985) documented through detailed studies that bird species may respond strongly to subtle variations in particular habitat elements in a species-specific manner.

2. 009- Source: After Toft et al. (1982). 178 + Circumstantial evidence of competition 25 The strong positive association between American Wigeon (Anas americana) and Green-winged Teal, however, was unexpected. This value was the result of a strong association in only one year when resources may have been nonlimiting. Toft and her colleagues concluded from these patterns that the null hypothesis that resources normally are not limiting in this system could be rejected and that the results confirmed a close relationship between overlap and competition intensity, the negative associations indicating strong competition.

Davidson and Evans (1982) examined dead Redshanks (Tringa totanus) and Oystercatchers (Haematopus ostralegus) found during a prolonged period of severe winter weather in Britain. The dead birds had much lower fat and protein reserves than did healthy birds at the same time. The birds that died presumably suffered food limitation. Perhaps the most compelling nonexperimental evidence of food limitation comes from the studies of Galapagos finches discussed in Volume 1. This work has shown that there are seasonal and yearly variations in seed abundance and that, on both between-island and within-island scales, finch biomass is positively correlated with seed biomass (especially small seeds) (Smiths al 1978, Grant and Grant 1980,Schluter 1982b, Boag and Grant 1984).

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The Ecology of Bird Communities. Volume 2: Processes and variations by John A. Wiens

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