Abstract
Secretive marsh birds (SMBs) are important indicator species of coastal wetlands but are difficult to detect and monitor. In coastal Louisiana, an important stronghold for these species, climate and hydrological models predict that freshwater and intermediate marshes will expand in the next 50 years, while brackish marshes will shrink. We used a multi-species Bayesian hierarchical occupancy model to estimate detection and occupancy probabilities for 11 SMB species in low and high saline marshes using data from automated recording units at 33 sites in southwestern Louisiana from February–June 2012. A quadratic effect of Julian date, but not minimum daily temperature nor precipitation affected detection of SMB species. King Rail (Rallus elegans), American Bittern (Botaurus lentiginosus), Common Gallinule (Gallinula galeata), and Pied-billed Grebe (Podilymbus podiceps) occupied mainly freshwater and intermediate marshes. Clapper Rail (Rallus crepitans), Seaside Sparrow (Ammospiza maritima), and Sora (Porzana carolina) predominantly occupied brackish and salt marshes. American Coot (Fulica americana), Purple Gallinule (Porphyrio martinica), Least Bittern (Ixobrychus exilis), and Marsh Wren (Cistothorus palustris) occupied both low and high saline marshes, showing flexibility that could maintain populations of these species as marsh salinities change in the future. If the current distribution of SMB species persists as marsh availability changes under future conditions, populations of the 4 species we found in low saline marshes may increase, whereas populations of at least 2 species found primarily in high saline marshes may decrease. Our modeling indicates that automatic recording units can produce comparable detection probabilities to other studies using traditional SMB sampling methods.
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Data Availability
All data used in this study have been deposited in ScienceBase and are accessible to the public (Waddle et al. 2020).
Code availability
Code used in this analysis may be obtained by contacting corresponding author.
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Acknowledgements
We thank T. Thigpen and M. Collins for assistance with field and laboratory work on this project. B. Glorioso assisted with the map in Fig. 1. We thank S. Rush for supplying detection values for comparison with our study. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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This study was funded by the U.S. Geological Survey.
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C.W.J. conceived of the study and acquired the initial funding; P.L.V. conducted field work and listened to the recordings; J.H.W. and L.R.J. analyzed the data and wrote the paper.
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All field work was conducted with permission from Louisiana Department of Wildlife and Fisheries. No animals were handled or directly impacted in this study.
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Clint W. Jeske was deceased
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Waddle, J.H., Jones, L.R., Vasseur, P.L. et al. Estimating Detection and Occupancy of Secretive Marsh Bird Species in Low and High Saline Marshes in Southwestern Louisiana Using Automated Recording Units. Wetlands 42, 26 (2022). https://doi.org/10.1007/s13157-022-01548-4
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DOI: https://doi.org/10.1007/s13157-022-01548-4