Abstract
Remote sensing is a valuable tool for wetland habitat quantification, monitoring and assessment. Here we show that habitat assessment via aerial image inspection is useful in predicting wetland site occupancy by black terns (Chlidonias niger), an imperiled and declining species throughout much of North America. We used Google Earth® images and National Wetlands Inventory maps to rank 390 candidate wetlands throughout Wisconsin (USA) according to their apparent suitability as nesting habitat for black terns and quantified habitat features associated with the suitability rankings. We then conducted ground-based suitability assessments and point counts of terns at most wetlands from May to July 2010. Pre-survey assessment resulted in 123 wetlands classified as suitable, 81 as marginal, and 186 as unsuitable. Wetlands ranked as suitable were more likely to be in the hemi-marsh stage, part of a wetland complex and relatively undisturbed. Black terns were present at 47 % of the wetlands considered suitable but only 11 % of the sites considered marginal or unsuitable. Of the 42 sites where nesting was confirmed, 79 % were at wetlands classified as suitable; no nesting was recorded in any wetlands deemed unsuitable. We found strong concordance in wetland suitability rankings between the two assessment methods (remote sensing, site surveys). We propose that remote sensing is an efficient and inexpensive way to predict site occupancy by wetland birds, such as black terns, that prefer a specific kind of habitat discernible from aerial imagery. This method may be particularly useful in areas, such as the Prairie Pothole region of North America, where ground surveys of all wetlands are not feasible.
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Acknowledgments
We thank the Loras College Environmental Research Fund for continued support of the black tern project over the years. The Pittman-Robertson Federal Aid-In-Restoration Act, administered by the Wisconsin Department of Natural Resources provided partial funding for this study. We thank the three anonymous referees who made helpful suggestions to improve the content and clarity of the manuscript. Funding Sources are Loras College Environmental Research Fund and Pittman-Robertson Federal Aid-In-Restoration Act.
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Shealer, D.A., Alexander, M.J. Use of aerial imagery to assess habitat suitability and predict site occupancy for a declining wetland-dependent bird. Wetlands Ecol Manage 21, 289–296 (2013). https://doi.org/10.1007/s11273-013-9300-z
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DOI: https://doi.org/10.1007/s11273-013-9300-z