Riparian vegetation communities along urban creeks are subject to high species turnover rates and dominance by non-native species. As a result, the composition of deposited in-stream leaf material is also frequently changing and contains a high proportion of non-native species. As this in-stream leaf litter is used as a food source by many aquatic detritivores, the rate of decomposition is important to the functional health of the ecosystem. The purpose of this study is firstly, to determine the role of urban riparian vegetation as an in-stream food source of macroinvertebrates, and, additionally to examine how non-native vegetation may contribute to the functional health of these systems. This experiment will be set-up in urban creeks across Brisbane, where six in-stream litter bags will be placed in each selected site. As many of the fast establishing and dominant non-native species occur at the herb and shrub level, experiments will separate leaf litter into classes of herb, shrub and trees. Hence, litter bags will contain either native or non-native herbs, shrubs, or trees, and control bags will contain a mixture of native and non-native leaf material. Bags will be placed within the creek for eight weeks before collection, when the proportion of leaf decomposition will be recorded. As dominant, fast-establishing non-native species also invest less energy into herbivory defence, it is predicted that they may prove to be a more preferable food source for the in-stream shredder communities than other native species.