Skip to Main Content
Point Count Length and Detection of Forest Neotropical Migrant BirdsAuthor(s): Deanna K. Dawson; David R. Smith; Chandler S. Robbins
Source: In: Ralph, C. John; Sauer, John R.; Droege, Sam, technical editors. 1995. Monitoring bird populations by point counts. Gen. Tech. Rep. PSW-GTR-149. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 35-44
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (1.5 MB)
DescriptionComparisons of bird abundances among years or among habitats assume that the rates at which birds are detected and counted are constant within species. We use point count data collected in forests of the Mid-Atlantic states to estimate detection probabilities for Neotropical migrant bird species as a function of count length. For some species, significant differences existed among years or observers in both the probability of detecting the species and in the rate at which individuals are counted. We demonstrate the consequence that variability in species' detection probabilities can have on estimates of population change, and discuss ways for reducing this source of bias in point count studies.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationDawson, Deanna K.; Smith, David R.; Robbins, Chandler S. 1995. Point Count Length and Detection of Forest Neotropical Migrant Birds. In: Ralph, C. John; Sauer, John R.; Droege, Sam, technical editors. 1995. Monitoring bird populations by point counts. Gen. Tech. Rep. PSW-GTR-149. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 35-44
- Effects of Sampling Strategy, Detection Probability, and Independence of Counts on the Use of Point Counts
- Statistical approaches to the analysis of point count data: a little extra information can go a long way
- Evaluating point count efficiency relative to territory mapping in cropland birds
XML: View XML