Landscape Ecology

, Volume 31, Issue 1, pp 43–53 | Cite as

Persistence and habitat associations of Purple Martin roosts quantified via weather surveillance radar

  • Eli S. Bridge
  • Sandra M. Pletschet
  • Todd Fagin
  • Phillip B. Chilson
  • Kyle G. Horton
  • Kyle R. Broadfoot
  • Jeffrey F. Kelly
Research Article

Abstract

Context

Weather surveillance radars (WSR) have been used to locate roost sites used by Purple Martins (Progne subis) for decades. Improvements in radar data processing and accessibility now make it possible to monitor roosts over a broad spatial scale.

Objectives

We sought to locate all of the Purple Martin roosts in North America and to use the data to evaluate (1) the land cover types associated with roosts (2) relationships among roost persistence, land cover type, and regional population trends.

Methods

We used mosaicked images of radar reflectivity based on the NEXRAD WSR network to locate 234 Purple Martin roosts that were active between 2009 and 2014. Of these roosts, we ground-truthed a subset of 57 with site visits and reports from citizen scientists. We assigned roosts to different classes based on local land cover, and used a variety of statistical and spatial analyses to address the objectives listed above.

Results

Roosts were mainly associated with forest, cropland, urban, and water land cover types, with cropland being the most common. There was an apparent preference for urban sites, and urban roosts were associated with the high year-to-year persistence. We found no correlation between roost persistence and regional population trends in data from the North American Breeding Bird Survey (BBS).

Conclusions

Although they use a diverse array of roosting habitats, urban roosting areas appear to be increasingly important for Purple Martins. Persistence of urban roosts was high, which aligns with the species’ unique natural history and its association with human societies.

Keywords

Aerial insectivores Aeroecology Purple Martin Radar Remote sensing Roost behavior 

Notes

Acknowledgments

This study was funded by NSF-EAGER Grant 143210. We thank the Purple Martin Conservation Association for sharing their database of martin roost locations, and we thank Jacob van der Ploeg for ground-truthing martin roosts locations in Texas, Oklahoma, Arkansas, Missouri, and Kansas during the summer of 2012.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Oklahoma Biological Survey and Ecology and Evolutionary Biology Ph.D. ProgramUniversity of OklahomaNormanUSA
  2. 2.Oklahoma Biological SurveyUniversity of OklahomaNormanUSA
  3. 3.Advanced Radar Research Center and School of MeteorologyUniversity of OklahomaNormanUSA
  4. 4.Oklahoma Biological Survey, Ecology and Evolutionary Biology Ph.D. Program, Department of Biology, and Advanced Radar Research CenterUniversity of OklahomaNormanUSA
  5. 5.Oklahoma Biological Survey and Department of BiologyUniversity of OklahomaNormanUSA
  6. 6.Oklahoma Biological Survey, Ecology and Evolutionary Biology Ph.D. Program, and Department of BiologyUniversity of OklahomaNormanUSA

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