WDFW LogoWashington Department of Fish & Wildlife
WDFW LogoPublications

You will need Adobe Reader to view and print publications.

Get Adobe Reader
Get Adobe® Reader

Archived Publications
contain dated information
that do not reflect current
WDFW regulations or policy.
These documents are provided
for archival purposes only.


    Advanced Search
  Search Tips

Download PDF Download Document

Get Adobe® Reader

Predation on Real and Artificial Nests in Shrubsteppe Landscapes Fragmented by Agriculture

Category: Wildlife Research and Management - Wildlife Research

Date Published: March 2002

Number of Pages: 11

Author(s): W. Matthew Vander Haegen (WDFW), Michael A. Schroeder (WDFW), and Richard M. Degraaf (USDA)

The Condor 104:496–506

Clearing of shrubsteppe communities for agriculture has created a highly fragmented landscape in eastern Washington, a condition that has been shown to adversely affect nesting success of birds in some forest and grassland communities.We used artificial nests monitored by cameras to examine relative effects of fragmentation, distance to edge, and vegetation cover on nest predation rates and to identify predators of shrubsteppenesting passerines and grouse. Predation rate for artificial nests was 26% (n = 118). Fragmentation had a strong influence on predation rates for artificial nests, with nests in fragmented landscapes about 9 times more likely to be depredated as those in continuous landscapes. Daily survival rate (± SE) for 207 real nests of 4 passerine species also was greater in continuous (0.978 ± 0.004) than in fragmented (0.962 ± 0.006) landscapes, although pattern of predation between real and artificial nests was not consistent among sites. Artificial nests were depredated by Common Ravens (Corvus corax), Black-billed Magpies (Pica hudsonia), Sage Thrashers (Oreoscoptes montanus), least chipmunks (Tamias minimus), and mice. Most nests in fragments were depredated by corvids (58%), whereas only Sage Thrashers and small mammals depredated nests in continuous landscapes. Increased predation by corvids and lower nest success in fragmented landscapes may have played a part in recent declines of some shrubsteppe birds. Future research should measure annual reproductive success of individual females and survival rates of juveniles and adults.