Abundance and nesting success of

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Abundance and nesting success of Acadian
Flycatchers (Empidonax virescens) at different
scales of habitat fragmentation
Leonardo Chapa Illinois Natural History
Survey Center for Wildlife Ecology
August, 2002
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(No Transcript)
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Scales of fragmentation
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Acadian Flycatcher
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Data Collection
Nest monitoring
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Digitizing nest locations and land use
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Measuring distances to edges
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Buffering nests
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Calculating land cover areas and edge lengths
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Effects of edge lengths and land cover
Nest predation
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Landscape-level Statistics
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Effects of forest width and forest Type on
Acadian Flycatcher abundance
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Landscape effects
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Regional-level statistics
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Regional effects
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Conclusions

• In general anthropogenic edges have negative
  effects and natural edges have positive effects.

• Edge effects are more evident in forested regions.

• Forest patches should be at least 500-m wide.

• Highly forested regions seem to be associated
  with increased nesting success (gt70 PFC is best).

• Conservation programs should take into account
  effects at all scales of fragmentation.