Status and Management of Three Colonial Waterbird Species in Alberta

Importance of Proximity to Foraging Areas for the Pacific Great Blue Heron (Ardea herodias fannini) Nesting in a Developed Landscape

“…In Manitoba, Koonz and Rakowski (1985) recommended a 1000 m protected area around colonies and a 600 m altitude limit for aircraft. In Alberta, Markham and Brechtel (1978) recommended banning access within 500 m of heronries and a 650 m minimum altitude limit for aircraft. Larger recommended buffer distances in the prairies may be because of the high visibility of heronries in prairies environments.…”

Populations of the Great Blue Heron (Ardea herodias) in New York State from 1964 to 1981

“…Great Blue Heron population distributions and the abundance of the species have been the focus of investigations in several regions of the United States and Canada (e.g., Pitts 1977, Graber et al 1978, Scharf 1978, Markham and Brechtel 1979, Thompson 1979, DesGranges 1980, McCrimmon 1981. In recent years, the persistence of reports of significant reduction in local or regional populations of the species, particularly in certain Midwestern states, has prompted the "Blue Listing" of the species by the National Audubon Society (Arbib 1979, Tate 1981.…”