The present work is based on a research conducted in summer of 2012 in Viikki Reserve, situated in urban Helsinki. Avian assemblages are compared in grazed and ungrazed shorelines based on variables of community structure and habitat resource use. The two most influential factors are aquatic invertebrate biomass index as food supply, and bare shoreline proportion as habitat structure indicator. . It is the first time this wetland, which is also a designated Natura 2000 and Ramsar site, is being investigated for wildlife community dynamics. The site does not suffer from major environmental threats and has potential for more waterfowl consumers. In view of its national and international significance, research can aid urban planners in management of this reserve to enhance avian diversity towards attracting species of more conservation concern.