Abstract
Context
Steep declines in North American rangeland biodiversity have prompted researchers and managers to use umbrella species as a tool to manage diverse suites of co-occurring wildlife, but efficacy of this method has been variable. Evaluation of prairie and shrubland grouse as umbrellas is typically restricted to observed overlap between umbrella and background species, but this approach does not distinguish between overlap due to ubiquity or niche overlap.
Objectives
We demonstrate a novel application of neutral landscape models (NLMs) to test the effectiveness of greater sage-grouse (Centrocercus urophasianus) as an umbrella species for grassland songbirds at a grassland-sagebrush ecotone in northeastern Wyoming, USA.
Methods
We leveraged existing spatial data representing sage-grouse habitat in two distinct seasons (nesting and late brood-rearing) and density and distribution of eight grassland songbirds. We applied a permutation-based analysis using NLMs to determine whether overlap between background species and greater sage-grouse was greater than expected by chance.
Results
Three species (western meadowlark Sturnella neglecta, loggerhead shrike Lanius ludovicianus, and lark bunting Calamospiza melanocorys) had greater overlap than expected with at least one type of greater sage-grouse habitat, while western kingbirds (Tyrannus verticalis) indicated avoidance of all sage-grouse habitat assessed.
Conclusions
NLMs provided a more nuanced evaluation of the umbrella species concept than previously available and allowed us to differentiate between overlap due to ubiquity (e.g., vesper sparrow; Pooecetes gramineus) rather than overlap in habitat use. All grassland passerine species with greater than expected overlap with sage-grouse habitat either nest in sagebrush (loggerhead shrike) or often select nest locations underneath small shrubs (western meadowlark, lark bunting). These results indicate that nesting substrate is a potential niche axis to consider when evaluating the umbrella species concept, especially within sagebrush-grassland ecotones.



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Acknowledgements
We thank B. Folt and two anonymous reviewers for comments on a previous version of this manuscript. Thanks also to M. Murphy for requiring the lead author to study NLMs prior to their preliminary exams. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Funding
This work was supported by the Department of Interior-Bureau of Land Management and the U.S. Geological Survey, as well as Oklahoma State Hatch Fund OKL03231.
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AP, DE, AH, MH, and CA obtained original funding for the project. CD and AP wrote the main manuscript text and conducted analyses. All authors reviewed and contributed to the manuscript.
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Duchardt, C.J., Monroe, A.P., Edmunds, D.R. et al. Using neutral landscape models to evaluate the umbrella species concept in an ecotone. Landsc Ecol 38, 1447–1462 (2023). https://doi.org/10.1007/s10980-022-01586-7
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DOI: https://doi.org/10.1007/s10980-022-01586-7


