Private residential property makes up approximately one-third of the urban landscape and studies show that the impact of wildlife gardening is substantial.
Initial findings from studies of 24 National Wildlife Federation certified habitats across the country suggest that wildlife gardening, if adopted on a wider scale, can help boost biodiversity: the variety of life that gives ecosystems their resiliency. This research was conducted as part of an ambitious four-year study American Residential Macrosystem: Yard Futures, funded by the National Science Foundation (NSF).
These properties can connect corridors of habitat necessary for migratory species between natural and larger protected areas of habitat on state, municipal and federal lands. They provide a continuum of resources if planted with a rich diversity of native plants and trees to supply the food chain for insects and the animals who depend on them. (Tallamy, 2007)
Another study examined whether or not the matrix of homes and private properties between and near habitat patches (like parks, riparian areas and other natural areas) in Cook County, IL (Chicago Area), plays a role in supporting healthy migratory and resident bird population.
The study found that “streets with bird-friendly yards had almost twice as many species as those without.” The study also indicated that the presence of a variety of native trees provides habitat complexity and is crucial to making these yards more bird-friendly. (Belaire, Whelan, Minor, 2015)
Since 1973, property owners who have Certified Wildlife Habitats with the National Wildlife Federation, have witnessed this sort of evidence first hand. More recently, specific studies have been conducted in which these certified properties were compared with nearby non-certified properties.
Research on Certified Wildlife Habitats confirmed that property owner commitment to providing the four elements of habitat, food, water, cover, and places to raise young, while practicing sustainable gardening and landscaping—made a real difference:
Certified Wildlife Habitat properties provided more abundant and higher quality wildlife habitat relative to non-certified yards. (Drake, Widows, 2014)
Certified Wildlife Habitats resulted in high percentages of:
Other literature along with participant self-reporting shows that habitat owners spent more time outside and that the overall increased oxygen producing vegetation, the visual interest and color of their active wildlife garden, and tree coverage had beneficial effects on both people and the ecosystem.
Bringing Nature Home: How You Can Sustain Wildlife with Native Plants. Douglas W. Tallamy, Timber Press, 2007
Evaluating Certified Wildlife Habitats and the Minds Behind Them. Practicum in Environmental Science. Jennifer M. Chan, Terry H. Chen, Yuxin Jin, Nicole M. Tachiki, Sara L. Vetter, Megan L. Vyenielo, Gina Y. Zheng. University of California Los Angeles. Institute of the Environment and Sustainability. 2014
Impact on the National Wildlife Federations’ Certified Wildlife Habitat Program on Mammalian Species Richness in Urbanized Residential Properties. Katherine L.M. Busch. Thesis, George Mason University, VA. 2013
Evaluating the National Wildlife Federation's Certified Wildlife Habitat™ program
Landscape and Urban Planning, Volume 129, Issue null, Pages 32-43. Steffenie A. Widows, David Drake. 2014.
Having our yards and sharing them too: the collective effects of yards on native bird species in an urban landscape. J. Amy Belaire, Christopher J. Whelan, & Emily S. Minor (2015). Ecological Applications 24(8), 2132–2143. DOI: 10.1890/13-2259.1.