Songbird and medium-sized mammal communities associated with exurban development in Pitkin County, Colorado

Residential development is occurring at unprecedented rates in the Rocky Mo untain region of the United States, with unknown ecological consequences. W e conducted our research in exurban development in Pitkin County, Colorado, between May and June in 1998 and 1999. Unlike suburban development, exurba n development occurs beyond incorporated city limits, and the surrounding m atrix remains the original ecosystem type We surveyed songbirds and medium- sized mammals at 30, 180, and 330 m away from 40 homes into undeveloped lan d to examine the effect of houses along a distance gradient, and in develop ments of two different housing densities as well as undeveloped sites to ex amine the effect of housing density. We placed bird species into one of two groups for the house-distance effect: (1) human-adapted species, birds tha t occurred in higher densities close to developments and lower densities fa rther away and (2) human-sensitive species, birds that occurred in highest densities farthest from homes and in lowest densities close to development. For both groups, densities of individual species were statistically differ ent between the 30- and 180-m sites. Six species were classified as human-a dapted, and six were classified as human-sensitive for the house-distance e ffect Dogs (Canis familiaris) and house cats (Felis domesticus) were detect ed more frequently closer to homes than farther away, and red foxes (Vulpes vulpes) and coyotes (Canis latrans) were detected more frequently farther away from houses. With respect to the effect of housing density, most avian densities did not differ significantly between high- and low-density devel opment but were statistically different from undeveloped sites Six species were present in higher densities in developed areas, and eight species were present in higher densities in undeveloped parcels. Similar results were f ound for mammalian species, with dogs and cats detected more frequently in high-density developments and red foxes and coyotes detected more frequentl y in underdeveloped parcels of land. From an ecological standpoint, it is p referable to cluster houses and leave the undeveloped areas in open space, as opposed to dispersing houses across the entire landscape.