Federal Register - June 1, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 103 / Tuesday, June 1, 2021 / Proposed Rules
29437
Lesser Prairie-Chicken Ecoregions
Sand Shinn Oak Prairie Ecoregion . . . .
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The Shinnery Oak Ecoregion occupies portions of eastern New Mexico and the South Plains of Texas McDonald et al.
2012, p. 2. It has a variable vegetation community that contains a mix of shrubs such as sand shinnery oak Quercus havardii and sand sagebrush Artemisia filifolia as well as mixed and tall grasses and forbs Grisham et al.
2016a, p. 317. The mean population estimate ranged between about 5,000 to 12,000 males through 1980, increased to 20,000 males in the mid-1980s and declined to 1,000 males in 1997 Hagen et al. 2017 pp. 69. The mean
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population estimate peaked again to 15,000 males in 2006 and then declined again to fewer than 3,000
males in the mid-2010s. While population estimates for the Shinnery Oak Ecoregion have varied over recent years, the most recent surveys estimate a 5-year average population size of 3,077
birds 90% confidence intervals CI:
170, 8,237. Approximately 11 percent of all lesser prairie-chicken occur in this ecoregion Service 2021, pp. 6678.
Lesser prairie-chicken from the Shinnery Oak Ecoregion are genetically distinct and geographically isolated from the other three ecoregions by 95
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miles mi 153 kilometers km Figure 3; Oyler-McCance et al. 2016, p. 653.
With the exception of lesser prairiechicken areas owned by the State Game Commission and federally owned BLM
lands in New Mexico, the majority of the Shinnery Oak Ecoregion is privately owned Grisham et al. 2016a, p. 315.
Nearly all of the area in the Texas portion of the ecoregion is privately owned and managed for agricultural use and petroleum production Haukos 2011, p. 110. The remaining patches of shinnery oak prairie have become isolated, relict communities because the surrounding grasslands have been
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Figure 3. The four ecoregions that make up the range of the lesser prairie-chicken;
the Sand Shinnery Oak Prairie Shinnery Oak Ecoregion, the Sand Sagebrush Prairie Sand Sagebrush Ecoregion, the Mixed-Grass Prairie Mixed-Grass Ecoregion, and the Short-grass/CRP Mosaic Short-Grass/CRP Ecoregion.
