Rocky Mountain Research Station Publications
RMRS Online Publication
RMRS-RP-45: Evaluating Great Lakes bald eagle nesting habitat with Bayesian inference
Grubb, Teryl G.; Bowerman, William W.; Bath, Allen J.; Giesy, John P.; Weseloh, D. V. Chip. 2003. Evaluating Great Lakes bald eagle nesting habitat with Bayesian inference. Res. Pap. RMRS-RP-45. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 10 p.
Bayesian inference facilitated structured interpretation of a nonreplicated, experience-based survey of potential nesting habitat for bald eagles (Haliaeetus leucocephalus) along the five Great Lakes shorelines. We developed a pattern recognition (PATREC) model of our aerial search image with six habitat attributes: (a) tree cover, (b) proximity and (c) type/amount of human disturbance, (d) potential foraging habitat/shoreline irregularity, and suitable trees for (e) perching and (f) nesting. Tree cover greater than 10 percent, human disturbance more than 0.8 km away, a ratio of total to linear shoreline distance greater than 2.0, and suitable perch and nest trees were prerequisite for good eagle habitat (having sufficient physical attributes for bald eagle nesting). The estimated probability of good habitat was high (96 percent) when all attributes were optimal, and nonexistent (0 percent) when none of the model attributes were present. Of the 117 active bald eagle nests along the Great Lakes shorelines in 1992, 82 percent were in habitat classified as good. While our PATREC model provides a method for consistent interpretation of subjective surveyor experience, it also facilitates future management of bald eagle nesting habitat along Great Lakes shorelines by providing insight into the number, type, and relative importance of key habitat attributes. This practical application of Bayesian inference demonstrates the technique's advantages for effectively incorporating available expertise, detailing model development processes, enabling exploratory simulations, and facilitating long-term ecosystem monitoring.
Keywords: aerial surveys, bald eagle, Bayesian inference, Great Lakes, habitat modeling, Haliaeetus leucocephalus, nesting habitat, pattern recognition.
About PDFs: For best results, do not open the PDF in your Web browser. Right-click on the PDF link to download the PDF file directly to your computer. Click here for more PDF help or order a printed copy of this publication.
The PDF below have been scanned and converted to text. Some errors may occur.
PDF File Size: 475 K
Sound recordings of road maintenance equipment on the Lincoln
National Forest, New Mexico
Electronic Publish Date: April 14, 2006
Last Update: January 15, 2010
RMRS Publications | Order a publication | Contact Us