Great Basin Naturalist


Avian use of scoria outcrop habitats was compared to use of sagebrush (Artemisia spp.)/grassland habitats. Outcrop habitats exhibited higher species richness, total population density, density of lark sparrows (Chondestres grammacus), and density of rock wrens (Salpinctes obsoletus). Western meadowlarks (Sturnella neglecta) and vesper sparrows (Pooecetes gramineus) were more abundant in sagebrush/grassland habitats than in scoria outcrops. Habitat relationship models indicated that the unique plant community and structural diversity diversity provided by the scoria outcrops were correlated with increased avain use.