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Threshold responses of grassland and sagebrush birds to patterns of disturbance created by an ecosystem engineer

Authors
  • Duchardt, Courtney J.1
  • Augustine, David J.2
  • Beck, Jeffrey L.1
  • 1 University of Wyoming, Department of Ecosystem Science and Management and Program in Ecology, 1000 E University Ave., Laramie, WY, 82070, USA , Laramie (United States)
  • 2 USDA-ARS Rangeland Resources and Systems Research Unit, 1701 Centre Ave, Fort Collins, CO, 80526, USA , Fort Collins (United States)
Type
Published Article
Journal
Landscape Ecology
Publisher
Springer-Verlag
Publication Date
Apr 02, 2019
Volume
34
Issue
4
Pages
895–909
Identifiers
DOI: 10.1007/s10980-019-00813-y
Source
Springer Nature
Keywords
License
Yellow

Abstract

ContextBurrowing mammals play a role in rangeland disturbance worldwide, enhancing habitat for certain species while negatively affecting others. However, little is known concerning effects of disturbance spatial pattern on co-occuring fauna. In the North American Great Plains, colonial black-tailed prairie dogs (Cynomys ludovicianus) may enhance habitat for one suite of birds while degrading habitat for others.ObjectivesWe examined the influence of prairie dogs on birds in a mosaic grassland–shrubland landscape. We evaluated how birds associated with shortgrass, midgrass, and sagebrush (Artemisia spp.) plant communities respond to spatial pattern of prairie dog disturbance and identified thresholds where abundance changes.MethodsWe surveyed bird abundance on prairie dog colonies of varying sizes and shapes, across colony edges into undisturbed habitat, and within undisturbed sagebrush in northeastern Wyoming. We modeled species responses to colony presence, distance to colony edge, and total area and edge density of colonies at four spatial scales (100 m, 225 m, 500 m, 1000 m).ResultsSagebrush specialists like Brewer’s sparrow (Spizella breweri) and sage thrasher (Oreoscoptes montanus) were 4.5 times more abundant in undisturbed shrublands. Conversely, the shortgrass-specialist mountain plover (Charadrius montanus) was abundant on colonies but showed a non-linear response to colony edge, increasing in abundance up to 600 m from edges then declining further towards colony cores.ConclusionsWhile some species may be broadly intolerant to disturbance, disturbance-dependent birds can display a “goldilocks syndrome” relative to disturbance size. As such, management for multiple species of conservation concern can be optimized relative to other goals by identifying thresholds associated with the effect of disturbance.

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