Declines in Populations of Great Blue Herons and Great Egrets in Five Midwestern States

Thompson, David H.

doi:10.2307/1520944

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1982

2008

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“…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.…”

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confidence: 99%