Importance of migrating salmon smolt in Ring-Billed (Larus delawarensis) and California Gull (L. californicus) diets near Priest Rapids Dam, Washington

Ring-billed (Larus delawarensis) and California Gulls (L. californicus) have been implicated in depredations on migrating salmon smolt in the Columbia River. As part of a gull management program conducted in 1995 and 1996, we collected L. delawarensis (n = 120) and L. californicus (n = 45) near Priest Rapids Dam, Washington, and analyzed stomach contents to determine food habits

Darryl L. York et al, Western North American Naturalist, Vol 60, No 2 (2000)