The results of seven breeding bird censuses on an upland site in Connecticut from 1953 to 1976 are analyzed and related to changes in vegetation and surrounding urbanization during the same period. Turnover of breeding bird species on the old-field portion of the site was due to vegetational changes that caused the extinction of species preferring open shrub habitats and the colonization of species preferring forest. Turnover of breeding birds on the forest portion was due to its increasing isolation from similar forest habitat, resulting in the local extinction of forest interior species and the colonization of species characteristic of suburban habitats. The study site is too small for the preservation of forest interior bird species. It must be coordinated with larger preserves in a regional context if it is to be useful in preventing the regional extinction of forest interior bird species.

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