Data to evaluate sensitivity of model results to scale and allotment overlap threshold

Publication Date

2017

Start Date

2003-01-01

End Date

2014-12-31

Monroe, A.P., 2017, Evaluating population responses of Greater sage-grouse to variation in public grazing records at broad scales: U.S. Geological Survey data release, https://doi.org/10.5066/F70K26RK.

In our analysis of effects of grazing level (relative grazing index), timing, and NDVI (Normalized Difference Vegetation Index) on the rate of population change for lek counts of male greater sage-grouse in Wyoming, USA (2004-2014), we initially measured covariates within 6.44 km of lek sites, a scale relevant to sage-grouse space use and population dynamics (Walker et al. 2007, Fedy et al. 2014). We also restricted grazing data to leks and years with >75% overlap of allotments with data (at the 6.44 km scale). To evaluate the sensitivity of our results to our choice of scale and selection of the >75% overlap threshold, we analyzed our best-supported model (with grazing level x timing interaction, covariates lagged by 1 year) with covariates measured within 3.25 km (Walker et al. 2007) and 8.5 km (Holloran and Anderson 2005), and while restricting grazing data to leks and years with >95% overlap of allotments with data. Here we provide data necessary for each analysis. Literature Cited: Fedy, B.C., et al. 2014. Habitat prioritization across large landscapes, multiple seasons, and novel areas: an example using greater sage-grouse in Wyoming. Wildlife Monographs 190:1-39. Holloran, M.J., and S.H. Anderson. 2005. Spatial distribution of greater sage-grouse nests in relatively contiguous sagebrush habitats. Condor 107:742-752. Walker, B.L., D.E. Naugle, and K.E. Doherty. 2007. Greater sage-grouse population response to energy development and habitat loss. Journal of Wildlife Management 71:2644-2654.

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