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Sources of variation in detection of wading birds from aerial surveys in the florida Everglades

Auk

6992_Conroy.pdf
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Abstract

We conducted dual-observer trials to estimate detection probabilities (probability that a group that is present and available is detected) for fixed-wing aerial surveys of wading birds in the Everglades system, Florida. Detection probability ranged from <0.2 to similar to 0.75 and varied according to species, group size, observer, and the observer's position in the aircraft (front or rear seat). Aerial-survey simulations indicated that incomplete detection can have a substantial effect oil assessment of population trends, particularly river relatively short intervals (<= 3 years) and small annual changes in population size (<= 3%). We conclude that detection bias is an important consideration for interpreting observations from aerial surveys of wading birds, potentially limiting the use of these data for comparative purposes and trend analyses. We recommend that workers conducting aerial surveys for wading birds endeavor to reduce observer and other controllable sources of detection bias and account for uncontrollable sources through incorporation of dual-observer or other calibratior methods as part of survey design (e.g., using double sampling).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Sources of variation in detection of wading birds from aerial surveys in the florida Everglades
Series title:
Auk
Volume
125
Issue:
3
Year Published:
2008
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
731-741
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Auk
First page:
731
Last page:
741
Number of Pages:
11