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20 - Does forest fragmentation and loss generate sources, sinks, and ecological traps in migratory songbirds?

Published online by Cambridge University Press:  05 July 2011

By
Scott K. Robinson  and
Jeffrey P. Hoover
Edited by
Jianguo Liu ,
Vanessa Hull ,
Anita T. Morzillo  and
John A. Wiens
Scott K. Robinson
Affiliation:
University of Florida
Jeffrey P. Hoover
Affiliation:
University of Illinois at Urbana-Champaign ,
Jianguo Liu
Affiliation:
Michigan State University
Vanessa Hull
Affiliation:
Michigan State University
Anita T. Morzillo
Affiliation:
Oregon State University
John A. Wiens
Affiliation:
PRBO Conservation Science
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Summary

Forest fragmentation and habitat loss on the breeding grounds of migratory songbirds have long been hypothesized to create source–sink dynamics. Forest fragments have increased the populations of many nest predators that are subsidized by food in the surrounding landscape and are themselves released from top predators. Migratory songbirds are also susceptible to brood parasitism by the brown-headed cowbird (Molothrus ater). As a result of reduced nesting success, reproductive output may be driven below the source–sink threshold. Source–sink dynamics occur within forest tracts, among patches in a landscape, and have been hypothesized to occur over entire regions in which sink populations within small tracts in mostly agricultural regions are rescued by distant source populations in mostly forested regions.

In the absence of ongoing habitat loss, habitat fragmentation will only generate continuing population declines if birds lack behavioral mechanisms that enable them to concentrate in the source habitat and avoid population sinks. If sink habitat is attractive, then it can become an ecological trap. There is growing evidence that many birds use decision rules based on nesting success that might enable them to avoid ecological traps created by high rates of nest predation. Most forest birds, however, do not have decision rules to avoid areas with heavy cowbird parasitism.

There are, however, a number of limitations with the fragmentation–source–sink paradigm. First, there is a critical need for improved data on the survival of adult and young birds. Second, we know very little about the spatial scale of dispersal in most species. Third, fragmentation-associated reductions in nesting success appear to be much weaker in some regions, especially in western North America. And fourth, it is far from clear that large habitat patches always act as source populations. Nevertheless, a conservation strategy that maintains or restores large forest tracts in mostly forested regions seems likely to maximize the ratio of source to sink habitat and to lead to sustainable populations.

Type
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Information
Sources, Sinks and Sustainability , pp. 423 - 449
Publisher: Cambridge University Press
Print publication year: 2011

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