Food for thought: supplementary feeding as a driver of ecological change in avian populations

Every year, millions of households provide huge quantities of supplementary food to wild birds. While alteration of the natural dynamics of food supply represents a major intervention in avian ecology, we have a remarkably limited understanding of the impacts of this widespread pastime. Here, we examine the many and varied responses of birds to supplementary feeding at backyard feeders – in large‐scale management projects and in focused academic studies – and evaluate population responses to the bird‐feeding phenomenon. Our review encompasses a wide range of species, from songbirds to raptors, and compares provisioning with a variety of foods, at different times of year and in different locations. We consider…

• DF
  Department for Employment and Learning, Northern Ireland