Cities devastate the natural habitats of animals, but simultaneously form new ecological niches and create conditions far different from natural environments. In these new conditions some insects, such as aphids, can develop quickly and they become important pests. This paper presents the population dynamics of aphids inhabiting the Norway maple in the urban conditions of Lublin. Also shown are relationships among the aphid species inhabiting the studied tree. We have shown that aphids are abundant on Acer platanoides and the most numerous species was Periphyllus aceris. This species was clear superdominant in both of the studied sites (the housing estate site and the street site). Using ecological indices allows us to determine that housing estate site is predominantly characterised by a larger species diversity than the street site. We have also presented that weather conditions have a significant influence on the number of aphids on the Norway maple. The highest number of aphids was observed in 2008, which was characterised by a warm spring. This paper is an attempt to answer the question whether the changes in the number of aphids are a result, of weather and habitat conditions, or, perhaps, also of mutual relations among species.

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