Wye Marsh Projects

Least Bittern Research at the Wye Marsh

The Least Bittern (Ixobrychus exilis) is a Nationally Threatened and Provincially Vulnerable bird, with an estimated population of less than 1000 nesting pairs in Canada.

A new and experimental standardized Ontario Least Bittern survey method from Canadian Wildlife Services was tested in 2004 at the Wye Marsh for the first time. The method included broadcasting a recorded call of a male Least Bittern and playing it at survey stations in order to obtain a response, which would establish the presence of Least Bittern nesting territories. Two nests, plus several responses and sightings of Least Bittern were observed, confirming Least Bittern presence in the Wye Marsh.

The new method proved successful in obtaining responses, and showed promise for national use as a surveying protocol. A standardized method would allow future researchers to more accurately assess Least Bittern abundance, distribution, habitat requirements, and population trends. Both the Least Bittern and the Black Tern have specific habitat requirements and are sensitive to disturbance; the study was undertaken by the Wye Marsh to ensure that we are doing all we can for these sensitive and delicate birds. The information from this study will be shared with the Natural Heritage Information Centre (NHIC) of the Ontario Ministry of Natural Resources.

Immeasurable thanks go especially to the volunteers, who donated their time and efforts in early hours, when chances to view the marsh's inhabitants were at their best. The field work for this study would not have been possible without them.

If you are interested in volunteering with this or other studies, feel free to contact the Wye Marsh at info@wyemarsh.com or (705) 526-7809.