Quick Answer
Sage Grouse prefer specific types of sagebrush due to its unique chemical composition and structural characteristics, which provide essential shelter, food, and breeding habitat. These birds seek out shrubs with dense foliage and a high concentration of volatile compounds, particularly those found in Artemisia tridentata var. vaseyana. This specific sagebrush type is often referred to as "big sagebrush."
Habitat Characteristics
Sage Grouse inhabit areas dominated by sagebrush, particularly big sagebrush, which provides essential shelter and food. These birds require a mix of open spaces and dense shrubs for nesting and roosting sites. When selecting a sagebrush habitat, they often prefer areas with a mix of young and mature shrubs, which provide a diverse array of food sources and shelter.
Chemical Composition and Preference
Studies have shown that Sage Grouse prefer sagebrush with a high concentration of volatile compounds, particularly sesquiterpenes and monoterpenes. These chemicals play a crucial role in deterring predators and attracting mates. Specifically, they prefer shrubs with a high concentration of the sesquiterpene, beta-caryophyllene, which is found in Artemisia tridentata var. vaseyana. In one study, Sage Grouse exhibited a strong preference for big sagebrush with a beta-caryophyllene concentration of 12.5% or higher.
Nesting and Breeding Sites
Sage Grouse often select nesting sites in areas with dense big sagebrush, typically within 10-15 meters of a prominent feature such as a rocky outcropping or a small stream. These birds prefer areas with a mix of young and mature shrubs, which provide a diverse array of food sources and shelter. During breeding season, males will often engage in an elaborate courtship display, strutting and drumming on a prominent sagebrush perch to attract females.
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