Do Indigenous Street Trees Promote More Biodiversity than Alien Ones? Evidence Using Mistletoes and Birds in South Africa
Open Access
Abstract
Trees in urban landscapes provide a range of ecosystem services, including habitat, refugia, food, and corridors for other fauna and flora. However, there is some debate whether the richness and abundance of other biodiversity supported is influenced by the provenance of trees, i.e., native or non-native. This study assessed the presence of mistletoes and birds (and nests) in 1261 street trees. There were marked differences between native and non-native street trees, with the former having a significantly higher prevalence of birds (and nests) and supporting more species and in greater densities, whilst the latter supported a higher prevalence of mistletoes. Additionally, for birds, the proximity to green space, tree size and species were also important, whilst for mistletoes, the proximity to green space, slope aspect, and tree species were significant. Preference ratios indicated that some tree species had a higher than random occurrence of birds or mistletoes, whilst others had a low abundance. The indigenous tree species, Acacia karroo Hayne was the only reasonably abundant street tree species that was important for birds, nests, and mistletoes. At the street scale, there was a positive relationship between street tree species richness and bird species richness. These results emphasise the importance of selecting appropriate tree species if biodiversity conservation is a core outcome.Keywords
Funding Information
- National Research Foundation, South Africa
This publication has 34 references indexed in Scilit:
- The Urban Forest and Ecosystem Services: Impacts on Urban Water, Heat, and Pollution Cycles at the Tree, Street, and City ScaleJournal of Environmental Quality, 2016
- Importance of urban trees and buildings as daytime roosts for batsBiologia, 2015
- Straddling the divide: den use by brushtail possums (Trichosurus vulpecula) in urban parklandsUrban Ecosystems, 2014
- A systematic quantitative review of urban tree benefits, costs, and assessment methods across cities in different climatic zonesUrban Forestry & Urban Greening, 2012
- Using the ecosystem services approach for better planning and conservation of urban green spaces: a Finland case studyBiodiversity and Conservation, 2010
- Urban domestic gardens (IX): Composition and richness of the vascular plant flora, and implications for native biodiversityBiological Conservation, 2006
- Preferences for and attitudes towards street flowers and trees in Sapporo, JapanLandscape and Urban Planning, 2004
- The aliens have landed! What are the justifications for ‘native only’ policies in landscape plantings?Landscape and Urban Planning, 2000
- Steps ahead: making streets that work in Seattle, WashingtonLandscape and Urban Planning, 1996
- Relative use of municipal street trees by birds during summer in state college, PennsylvaniaUrban Ecology, 1986