New York Natural Heritage Program
Prothonotary Warbler
Protonotaria citrea (Boddaert, 1783)

Threats [-]
The primary threat in most areas is loss of suitable habitat (McGowan and Corwin 2008). Loss of old growth forest associated with riparian habitats is detrimental because older trees are more likely to develop nesting cavities. Widespread drainage of required wetland habitat is also a significant threat.

Conservation Strategies and Management Practices [-]
Prothonotary Warblers prefer more mature forests with tree cavities and snags. Trees that are most suitable have a diameter at breast height of 15 centimeters (6 inches). A permanently uncut buffer zone on both sides of streams to maintain or provide thick and shady vegetation along stream banks would be beneficial to this species. Buffer zones are recommended to be at least 90 meters (295 feet) wide (Bushman and Therres 1988 cited in NatureServe 2006). Since Prothonotary Warblers are also know to use nest boxes (NatureServe 2006), it may be beneficial to provide them in areas where natural tree cavities are in short supply.

Research Needs [-]
Additional studies are needed to determine what techniques are best for monitoring Prothonotary Warbler populations. Consistent monitoring of breeding populations could provide important information on population recruitment and dynamics (NatureServe 2006).