Providing evidence to improve practice

Individual study: Comparison of the avian communities of 'mitigation' versus natural forested wetlands in the Chowan River basin, Virginia, USA

Published source details

Snell-Rood E.C. & Cristol D.A. (2003) Avian communities of created and natural wetlands: bottomland forests in Virginia. The Condor, 105, 303-315

This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Restore or create inland wetlands Bird Conservation

A replicated, controlled study from May-July in 2000 in Virginia, USA (Snell-Rood & Cristol 2003), found that bird species richness and diversity in artificially created wetlands were significantly lower than in natural wetlands (average of 11 species/site for six artificial wetlands vs. 17 for five natural wetlands). Although total bird abundance, and the abundance of wading birds, waterfowl, raptors, aerial feeders or woodpeckers were similar, natural wetlands had significantly higher songbird abundance. In addition, created wetlands exhibited bird communities with significantly lower conservation value (based trophic level and migratory status) but similar average habitat specificity and wetland dependency. All wetlands had similar surrounding habitats and were of similar ages (time since planting for created and since logging for natural wetlands), and sizes (5-15 ha).