Skip to Main Content
Evaluating methods for monitoring populations of Mexican spotted owls: A case studyAuthor(s): Jospeh L. Ganey; Gary C. White; David C. Bowden; Alan B. Franklin
Source: In: Thompson, W. L., ed. 2004. Sampling Rare or Elusive Species: Concepts, Designs, and Techniques for Estimating Population Parameters. Washington, D.C.: Island Press. p. 337-385.
Publication Series: Book Chapter
Station: Rocky Mountain Research Station
PDF: View PDF (12.47 MB)
DescriptionMonitoring population status of rare or elusive species presents special challenges. Understanding population trends requires separating signal (true and important changes in abundance) from noise (normal temporal and sampling variation; e.g., Block et al. 2001). This is particularly difficult when small numbers or elusive habits make it difficult to obtain precise estimates of population parameters (Thompson et al. 1998:68). We conducted a pilot study to evaluate a sampling design proposed for monitoring populations of the threatened Mexican spotted owl (Strix occidentalis lucida; USDI Fish and Wildlife Service 1995). Here, we discuss this effort as a case study illustrating some pitfalls and issues involved in sampling rare and/or elusive populations. We begin with a brief history of events leading up to the pilot study to provide a context for the study. We then describe study design and implementation and summarize results of the study and conclusions following from those results. Future monitoring efforts may benefit from our efforts and the lessons we learned.
- You may send email to email@example.com 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.
CitationGaney, Jospeh L.; White, Gary C.; Bowden, David C.; Franklin, Alan B. 2004. Evaluating methods for monitoring populations of Mexican spotted owls: A case study. In: Thompson, W. L., ed. 2004. Sampling Rare or Elusive Species: Concepts, Designs, and Techniques for Estimating Population Parameters. Washington, D.C.: Island Press. p. 337-385.
KeywordsMexican spotted owls, Strix occidentalis lucida, monitoring, population trends
- Quantitative genetics in natural populations: Means of monitoring natural biological processes
- Chapter 3. Planning and design for habitat monitoring
- Combining field observations and genetic data to reconstruct the invasion of Phytophthora ramorum in California
XML: View XML