Spatial heterogeneity stabilizes livestock productivity in a changing climate

• Published in: Agriculture, ecosystems & environment ecosystems & environment, 2014-08, Vol.193, p.37-41
• Main Authors: Allred, Brady W., Scasta, John Derek, Hovick, Torre J., Fuhlendorf, Samuel D., Hamilton, Robert G.
• Format: Article
• Language: English
• Subjects: Agriculture; Agronomy. Soil science and plant productions; Animal productions; Biological and medical sciences; Cattle; Climate; Climatic extremes; Drought; Fire-grazing interaction; Fires; Fundamental and applied biological sciences. Psychology; General agroecology; General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping; General agronomy. Plant production; Generalities. Agricultural and farming systems. Agricultural development; Great Plains; Heterogeneity; Livestock; Precipitation; Productivity; Rainfall; Terrestrial animal productions; Vertebrates; Weight gain
• ISSN: 0167-8809; 1873-2305
• DOI: 10.1016/j.agee.2014.04.020

•Increased climate variability threatens livestock productivity.•Spatial heterogeneity decouples the relationship of livestock productivity and precipitation.•Spatial heterogeneity stabilizes livestock production through time, mitigating productivity loss caused by climatic extremes.•Integrating heterogeneity into livestock management has multiple benefits. Sustaining livestock agriculture is important for global food security. Livestock productivity, however, can fluctuate due to many environmental factors, including climate variability. Current predictions of continued warming, decreased precipitation, and increased climate variability worldwide raise serious questions for scientists and producers alike. Foremost is understanding how to mitigate livestock production losses attributed to climate extremes and variability. We investigated the influence of spatial heterogeneity on livestock production over six years in tallgrass prairie of the southern Great Plains, USA. We manipulated heterogeneity by allowing fire and grazing to interact spatially and temporally at broad scales across pastures ranging from 430 to 900ha. We found that the influence of precipitation on livestock productivity was contingent upon heterogeneity. When heterogeneity was absent, livestock productivity decreased with reduced rainfall. In contrast, when heterogeneity was present, there was no relationship with rainfall and livestock productivity, resulting in heterogeneity stabilizing livestock productivity through time. With predicted increases in climate variability and uncertainty, managing for heterogeneity may assist livestock producers in adapting to climate change and in mitigating livestock productivity loss caused by climatic variability.