Optimizing the Duration of Point Counts for Monitoring Trends in Bird Populations

Optimizing the Duration of Point Counts for Monitoring Trends in Bird Populations PDF

Author: Jared Verner

Publisher:

Published: 1988

Total Pages: 4

ISBN-13:

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Minute-by-minute analysis of point counts of birds in mixed-conifer forests in the Sierra National Forest, central California, showed that cumulative counts of species and individuals increased in a curvilinear fashion but did not reach asymptotes after 10 minutes of counting. Comparison of the expected number of individuals counted per hour with various combinations of counting time and noncounting times for record keeping and travel between counting stations showed that 10-minute counts were most efficient in most cases. Counting longer than 10 minutes is not recommended, because other increased risk of double counting some individuals.

Monitoring Bird Populations by Point Counts

Monitoring Bird Populations by Point Counts PDF

Author: C. John Ralph

Publisher: DIANE Publishing

Published: 1998-05

Total Pages: 192

ISBN-13: 9780788143441

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Point counts of birds are the most widely used quantitative method and involve an observer recording birds from a single point for a standardized time period. In response to the need for standardization of methods to monitor bird populations by census, researchers met to present data from various investigations working under a wide variety of conditions, and to examine various aspects of point count methodology. Statistical aspects of sampling and analysis were discussed and applied to the objectives of point counts. The final chapter presents these standards and their applications to point count methodology.

Monitoring Bird Populations by Point Counts

Monitoring Bird Populations by Point Counts PDF

Author: C. Ralph

Publisher: CreateSpace

Published: 2012-04-29

Total Pages: 190

ISBN-13: 9781475278750

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Point counts of buds are the most widely used quantitative method and involve an observer recording buds from a single point for a standardized time period. In response to the need for standardization of methods to monitor bird populations by census, various investigators met in Maryland in late fall 1991 to evaluate point counts. Their objectives were to present data from various investigations working under a wide variety of conditions, and to examine various aspects of point count methodology. This volume contains the papers given at the workshop, as well as a few additional relevant papers that subsequently have been submitted to the technical coordinators. Statistical aspects of sampling and analysis were discussed and applied to the objectives of point counts. From this base, at interactive sessions the participants discussed and agreed upon standards of point counts that should have wide applicability to a variety of habitats and terrain. The final chapter presents these standards and their applications to point count methodology. Forest Service, US Department of Agriculture

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