Lark sparrow (Chondestes grammacus) abundance, density, and the effects of microhabitat factors on nest success in cemeteries in southern Oklahoma

Abstract

Since 1966, Lark Sparrow (Chondestes grammacus) populations have undergone population declines and range shifts. In 2015-2016, we collected data on Lark Sparrow abundance, density, nest success, brood parasitism by Brown-headed Cowbirds (Molothrusater), and nesting microhabitat in cemeteries in southern Oklahoma. Lark Sparrow abundance (0.67-1.29/point) was greater in our study than in other studies across the species’ range; however, Lark Sparrow density (35.2-52.2/40 ha) was similar to other studies. Lark Sparrows laid an average of 3.2 eggs/nest and fledged an average of 1.1 fledglings/nest in southern Oklahoma cemeteries. Brood parasitism was documented in only 10% of nests, which is lower than previous rates of 19-45.5% in southern Oklahoma. Nest height was positively related to Lark Sparrow nest success and fledging rate and percentage of artificial material was positively related to the number of fledglings.