Nest predation and neotropical migrant songbirds: piecing together the fragments

Nest predation accounts for the largest share of nest failures in most spec ies of neotropical migrant songbirds and contributes to low reproductive su ccess. Increased rates of nest predation have often been related to habitat fragmentation and edge effects. However, recent studies have emphasized th e mediating effect of landscape structure and composition on rates of nest predation. The identity of important nest predators at a local site also ma y vary regionally and in response to landscape characteristics. Needed are comparative studies and manipulative experiments that identify conditions u nder which nest predation is a critical concern and assess situations where management can be effective.