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We measured the activity of mammalian predators, numbers of singing male songbirds, and predation rates on nests of songbirds (152 natural, open-cup nests and 380 artificial nests) on 38 250 m transects located along various types of forest-field edges in a wildlife management area in east-central Illinois. We then related these variables to each other and to measures of the vegetative structure of...
Edge habitats may be considered ecological traps for breeding birds if they attract many birds because of apparently favorable nesting conditions but have higher nest predation levels than interior habitats. Four alternative, nonexclusive hypotheses have been suggested to explain why edges might have higher predation levels than interior habitats: (1) predator activity is higher in areas with...
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