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Effects of management intensity, function and vegetation on the biodiversity in urban ponds
- Blicharska, Malgorzata (author)
- Andersson, Johan (author)
- Bergsten, Johannes (author)
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- Bjelke, Ulf (author)
- Hilding-Rydevik, Tuija (author)
- Johansson, Frank (author)
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- 2016
- 2016
- English.
- In: Urban Forestry & Urban Greening. - 1618-8667. ; 20, 103-112
- swepub:Mat__t
Abstract
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- Ponds are important elements of green areas in cities that help counteract the negative consequences of urbanization, by providing important habitats for biodiversity in cities and being essential nodes in the overall landscape-scale habitat network. However, there is relatively little knowledge about the impacts of pond management intensity, function and environmental variables on urban pond biodiversity. In this study we addressed this gap by investigating which factors were correlated with the level of biodiversity in urban ponds, indicated by species richness of aquatic insects, in Stockholm, Sweden. Our study did not confirm any direct link between the perceived intensity of management or function of ponds and overall biodiversity. However, it seems that management can influence particular groups of species indirectly, since we found that Trichoptera richness (Caddisflies) was highest at intermediate management intensity. We suggest that this is caused by management of vegetation, as the amount of floating and emergent vegetation was significantly correlated with both the overall species richness and the richness of Trichoptera (Caddisflies). This relationship was non-linear, since ponds with an intermediate coverage of vegetation had the highest richness. Interestingly, the amount of vegetation in the pond was significantly affected by pond function and pond management. The overall species richness and richness of Trichoptera were also positively correlated with pond size. Since we found that the pattern of relations between species richness and environmental variables differed between the insect groups we suggest that it will be difficult to provide overall design and management recommendations for ponds in urban green areas. Therefore, it is recommended that to provide high aquatic diversity of species in urban areas one should aim at promoting high diversity of different types of ponds with differing management and environmental factors that shape them.
Subject headings
- Natural Sciences (hsv)
- Biological Sciences (hsv)
- Ecology (hsv)
- Naturvetenskap (hsv)
- Biologiska vetenskaper (hsv)
- Ekologi (hsv)
Keyword
- Aquatic insects
- Biodiversity Pond function
- Pond management
- Pond vegetation
- Urban
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