How to translate text using browser tools
1 September 2008 Monitoring Birds of Prey in Finland: A Summary of Methods, Trends, and Statistical Power
Pertti Saurola
Author Affiliations +

In Finland, Comprehensive Surveys to monitor numbers and productivity of four endangered species of birds of prey were started in the early 1970s. In 1982, the Ringing Center launched the Raptor Grid, a nationwide monitoring program for all other bird-of-prey species based on 10 × 10 km study plots of the Finnish National Grid. The annual total of study plots surveyed by voluntary raptor ringers has averaged 120. Since 1986, additional information on breeding performance has been collected using the Raptor Questionnaire. In 2006, more than 44 262 potential nest sites of birds of prey were inspected, and 12 963 occupied territories, including 8149 active nests, were found and reported by ringers. The population trend during 1982–2006 has been significantly negative in six species and positive or neutral in 18 species. Statistical power of the time series of numbers and productivity has been adequate for all species except the microtine specialists.

Pertti Saurola "Monitoring Birds of Prey in Finland: A Summary of Methods, Trends, and Statistical Power," AMBIO: A Journal of the Human Environment 37(6), 413-419, (1 September 2008).[416:MBOPIF]2.0.CO;2
Published: 1 September 2008

This article is only available to subscribers.
It is not available for individual sale.

Get copyright permission
Back to Top