British Columbia Nocturnal Owls Survey
British Columbia Ministry of Environment
Project name: BC-Yukon Nocturnal Owl Survey Data Entry
Goals : The British Columbia-Yukon Nocturnal Owl Survey monitors trends in owl populations through road-based methods similar to those used in the Breeding Bird Survey.
Dataset summary : The British Columbia-Yukon Nocturnal Owl Survey monitors trends in owl populations through road-based methods similar to those used in the Breeding Bird Survey.
Status : Active
Year started : 2000
Years (comments) : ongoing
Frequency : Annually
Geographic area covered : BC and YT
Type(s) of habitat : all rural and forested habitats
Primary species covered : Eight owl species
Sampling Design : Randomly selected routes
Field methods : Similar to other roadside surveys using tape playback. Two volunteers drive pre-determined route, stopping at fixed intervals (1.6 km apart) along roadside. At each stop, 2-minute listening periods. Surveyor identifies and records all owls seen or heard during each listening period. Surveys begin one half hour after sunset during a single evening in spring and take approximately 1 hour to complete (not including travel time to and from the survey route).
Data format : In Access database, accessible on request
Sample size : 2072 stops
Results : annual newsletters sent to all participants; available in PDF on request
Trends and time series availability : Trends will be calculated after five years of data
Funding sources : BSC
Applications for the data : Counts used for statistical analysis of population trends, habitat associations, possibly population numbers
Users of the information : BSC, BC government biologists, YT and CWS biologists, other conservation organizations, raptor biologists
Environmental assessment : Used by CWS and YT governments for state of environment report in Yukon