Class
Article
Department
Biology
Presentation Type
Poster Presentation
Abstract
Woodpeckers provide important ecological services by excavating nesting cavities that are used by many forest birds and animals. Black-backed woodpeckers (Picoides arcticus) have been declining throughout their range and are now a threatened species. The failure of black-backed woodpeckers to reproduce can lead to a decline of nesting cavities, which in turn can lead to a decline in secondary cavity nesters. One of the challenges black-backed woodpeckers face is displacement from their nesting cavities by aggressive secondary cavity nesters.The western bluebird (Sialia Mexicana) is known to usurp nests, even from its own kind. However, the process by which bluebirds take over nests has not been well documented. In order to understand the process by which bluebirds take over woodpecker nests, we analyzed 112 hours of video footage from two different nests located in the Okanogan-Wenatchee forest in Washington. Usurpation first involves a short period of physical confrontation followed by a prolonged period of constant presence around the nest. The male and female bluebird apparently cooperate by taking turns harassing the woodpecker and guarding the nest. The entire takeover process seems to only require one day. This information will be useful to forest managers in charge of monitoring black-backed woodpeckers, especially in areas with high bluebird density.
Start Date
4-14-2016 10:30 AM
End Date
4-14-2016 11:14 AM
Included in
Tag-Team Takeover: Usurpation of Woodpecker Nests by Western Bluebirds
Woodpeckers provide important ecological services by excavating nesting cavities that are used by many forest birds and animals. Black-backed woodpeckers (Picoides arcticus) have been declining throughout their range and are now a threatened species. The failure of black-backed woodpeckers to reproduce can lead to a decline of nesting cavities, which in turn can lead to a decline in secondary cavity nesters. One of the challenges black-backed woodpeckers face is displacement from their nesting cavities by aggressive secondary cavity nesters.The western bluebird (Sialia Mexicana) is known to usurp nests, even from its own kind. However, the process by which bluebirds take over nests has not been well documented. In order to understand the process by which bluebirds take over woodpecker nests, we analyzed 112 hours of video footage from two different nests located in the Okanogan-Wenatchee forest in Washington. Usurpation first involves a short period of physical confrontation followed by a prolonged period of constant presence around the nest. The male and female bluebird apparently cooperate by taking turns harassing the woodpecker and guarding the nest. The entire takeover process seems to only require one day. This information will be useful to forest managers in charge of monitoring black-backed woodpeckers, especially in areas with high bluebird density.