South River Greenway IBA is made up of two forested corridors flanking the North River and Bacon Bridge Branch of the South River in Anne Arundel County. These habitat corridors join at the confluence of the two tributaries at Route 50. The site is one of the largest forest blocks in Anne Arundel County outside the Patuxent Research Refuge. Mature deciduous forest covers most of the site. The narrow stream floodplains support a variety of wetland types, including forested wetland, shrub wetland, and emergent marsh, and the steep slopes have a dense understorey of mountain laurel in places. A 546-acre parcel on Bacon Ridge Branch is owned by the Maryland Environmental Trust. Anne Arundel County owns the adjacent Bacon Ridge Natural Area Park. The remainder of the site is owned by private landowners.

Ornithological Summary

The principal bird interest of this site is the diverse assemblage of Forest-Interior Dwelling Species (FIDS), 18 species of which breed regularly. These are birds defined by Maryland DNR as requiring large, intact patches of forest habitat. The mean number of FIDS per breeding Bird Atlas block here is 16.25, which is at the 88th percentile of all Atlas blocks on Maryland's coastal plain (BCR 30 in Md). A relatively dense shrub layer, resulting from deer hunting, gives rise to good densities of forest shrub-nesters, such as Hooded Warbler and Black-and-white Warbler. Bird Blitz surveys organized by Audubon in 2007 found 3 at-risk species, Worm-eating Warbler, Kentucky Warbler and Louisiana Waterthrush, in numbers suggesting that their populations here exceed state-level IBA thresholds.

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