Garden Size, Householder Knowledge, and Socio-Economic Status Influence Plant and Bird Diversity at the Scale of Individual Gardens
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Domestic gardens collectively cover substantial areas within cities and play an important role in supporting urban biodiversity and ecosystem functioning. The extent of their contribution to urban biodiversity is ultimately determined by the attitudes, motivations, and practices of their owners. We identified variables characterizing individual householders and their properties that explained variation in perennial plant and avian species richness and plant diversity among 55 gardens in New Zealand. The size of the vegetated area was most important in explaining bird and plant diversity, independent of property size. Also important and positively associated with plant richness were socio-economic status and ability to discriminate between native and exotic species. Median housing age and neighborhood green space were less important. Contrary to expectations, better educated householders who demonstrated pro-environmental orientation (NEP) did not necessarily have gardens with greater plant diversity, however, people with higher NEP scores tended to have gardens with more structurally complex vegetation. Similar variables were important in explaining native and exotic species richness, but higher exotic plant diversity was associated with older people with smaller properties of lower value. Avian species richness increased primarily with vegetated area, but also the areas of beds and hedges. We demonstrate that although householder knowledge is an important determinant of garden biodiversity, vegetated area is most important. Promoting urban garden biodiversity requires that larger vegetated properties be supported and encouraged, and that planners should consider biodiversity when formulating policies concerning garden size, property size, and consents that may result in a progressive increase in the proportion of built over/paved areas.
Keywordsgarden native birds urban ecology urbanization householder knowledge
We thank all those who gave their time to participate in this study. A University of Otago Research Grant provided funding. P. Seddon and two anonymous reviewers improved the manuscript.
- Clark KR, Gorley RN. 2006. Primer-E Ltd, Plymouth.Google Scholar
- Day T. 1995. Bird species composition and abundance in relation to native plants in urban gardens, Hamilton, New Zealand. Notornis 42:175–86.Google Scholar
- Doody BJ, Sullivan JJ, Meurk CD, Stewart GH, Perkins HC. 2010. Urban realities: the contribution of residential gardens to the conservation of urban forest remnants. Biol Conserv 19(5):1385–400.Google Scholar
- Given D, Meurk C. 2000. Biodiversity of the urban environment: the importance of indigenous species and the role urban environments can play in their preservation. In: Stewart GH, Ignatieva ME, Eds. Urban biodiversity and ecology as a basis for holistic planning and design: proceedings of a workshop held at Lincoln University, 28–29 October 2000, Christchurch: Wickliffe Press, p. 22–33.Google Scholar
- Hall T. 2010. Life and death of the Australian backyard. Collingwood, VIC: CSIRO Publishing.Google Scholar
- Head L, Muir P. 2007. Backyard: nature and culture in suburban Australia. Wollongong: Wollongong University Press.Google Scholar
- Kinzig AP, Warren P, Martin C, Hope D, Katti M. 2005. The effects of human socioeconomic status and cultural characteristics on urban patterns of biodiversity. Ecol Soc 10(1):23.Google Scholar
- London Assembly Environment Committee. 2005. Crazy Paving: the environmental importance of London’s front gardens. London: Greater London Authority.Google Scholar
- London Biodiversity Partnership. 2001. Habitat action plan; Private gardens, London Biodiversity Partnership.Google Scholar
- Magurran AE. 2004. Measuring biological diversity. Oxford: Blackwell Science Ltd.Google Scholar
- Melles SJ. 2005. Urban bird diversity as an indicator of human social diversity and economic inequality in Vancouver, British Columbia. Urban Habitats 3(1): 25–48. ISSN 1541-7115. http://www.urbanhabitat.org.
- Meurk CD, Zvyagna N, Gardner RO, Forrester G, Wilcox M, Hall G, North H, Belliss S, Whaley K, Sykes B, Cooper J, O’Halloran K. 2009. Environmental, social and spatial determinants of urban arboreal character in Auckland, New Zealand. McDonnell MJ, Hahs AK, Breuste JH, Eds. Ecology of Towns and cities: a comparative approach. Cambridge: Cambridge University Press.Google Scholar
- Owen J. 1991. The ecology of a garden: the first fifteen years. Cambridge: Cambridge University Press.Google Scholar
- Pauleit S, Ennos R, Golding Y. 2005. Modelling the environmental impacts of urban land use and land cover change: a study in Mersyside, UK. Landsc Urban Plan 71:295–310.Google Scholar
- Strohbach MW, Haase D, Kabisch N. 2009. Birds and the city: urban biodiversity, land use and socioeconomics. Ecol Soc 14(2):31.Google Scholar