1 Contrasting effects of urban habitat complexity on metabolic functional diversity and composition of litter and soil bacterial communities Alessandro Ossola *1 , Cristina Aponte 1 , Amy K. Hahs 2,3 , Stephen J. Livesley 1 1 School of Ecosystem and Forest Sciences, The University of Melbourne, 500 Yarra Boulevard, 3121, Richmond, VIC, Australia. 2 Australian Research Centre for Urban Ecology, Royal Botanic Gardens Victoria, Birdwood Ave, South Yarra, Victoria 3141, Australia 3 School of BioSciences, The University of Melbourne, Parkville, Victoria 3010, Australia * Corresponding author: alessandro.ossola@unimelb.edu.au , tel: +61 3 9035 5511