Parent Layer: Chihuahuan_Mixed_Desert_and_Thornscrub

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Description: NatureServe’s framework for measuring climate change vulnerability of habitats and ecosystems (HCCVI) provides a practical approach to organize criteria and indicators for this purpose (Comer et al. 2012). This framework provides a scorecard for reporting on the relative climate change vulnerability of a given habitat or ecosystem type within spatial analysis units that are >100km2 in size. The layer represents the scorecard of multiple indicator values of climate change exposure and ecological resilience. All component layers include index values standardized to a 0.0-1.0 range, with 1.0 indicating highestecological condition, and 0.0 indicating lowestecological condition.Therefore, the lowest quartile of index scores indicate Very High vulnerability to climate change effects within the assessment timeframe. Resilience scores reflect the summary of subscores for ecological sensitivity and adaptive capacity. Sensitivity includes measures of ecological condition or integrity, as with decreasing integrity, ecosystem responses to climate change stress are increasingly compromised. Measures for sensitivity of upland vegetation types include landscape condition (based on land use intensity), invasive annual grass risk, and fire regime alteration (using LANDFIRE Fire Regime Condition Class). Adaptive capacity addresses natural characteristics of the ecosystem type that lend a degree of capacity to cope with climate change stress. Biotic measures include estimates of diversity within functional species groups, and relative vulnerability of any “keystone” species. An abioticmeasure includes topoclimatic variability. This indicates the likelihood of high microclimate diversity within landscapes that support the ecosystem type; thus buffering aspects of rapidly changing climate for characteristic species in the ecosystem type. Map layers may be displayed by base level indicators, by summary scores of Sensitivity and Adaptive Capacity, overall Resilience scores, overall Climate Change Exposure scores, and overall Climate Change Vulnerability.

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Spatial Reference: 102100  (3857)

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