Feeding habitat use by colonially-breeding herons, egrets, and ibises in North Carolina

The Auk
By:  and 



Nine species of herons, egrets, and ibises were followed by airplane from a nesting colony near Beaufort, North Carolina to their feeding sites. Except for Cattle Egrets, which flew exclusively to fields and dumps, the birds flew mainly to saltmarsh habitat. The selection of feeding habitats by Great Egrets and Louisiana Herons was directly related to tidal depth. The Great Egret was the only species that effectively used eelgrass beds, and its use of this habitat was restricted to between 1.5 h before and after low tide. We suspect that shorter-legged herons did not use eelgrass regularly because the water was too deep. Most Great Egrets, White Ibises, Louisiana Herons, and Snowy Egrets used areas near the colony (<4 km). Great Egrets, Black-crowned Night Herons, and White Ibises flew farther from the colony at high than at low tide. Great Egrets traveled farther from the colony when they used thermals; rate of travel to feeding sites was the same, however, whether or not they used thermals. Aggressive encounters were observed at the landing sites of Great Egrets, Louisiana Herons, Snowy Egrets, and Black-crowned Night Herons. In contrast to the other species studied, Cattle Egrets and White Ibises often flew in groups to feeding sites. Indirect evidence supports the hypothesis that colonies can act as "information centres," wherein unsuccessful birds follow successful ones to better feeding locations.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Feeding habitat use by colonially-breeding herons, egrets, and ibises in North Carolina
Series title The Auk
Volume 95
Issue 4
Year Published 1978
Language English
Publisher American Ornithological Society
Contributing office(s) Upper Midwest Environmental Sciences Center, Patuxent Wildlife Research Center
Description 11 p.
First page 733
Last page 743
Country United States
State North Carolina