An Aerial Survey of Waterbird Colonies Along the Upper Mississippi River and Their Relationship to Dredged Material Deposits

Aerial surveys of 1040 km of the Upper Mississippi River, Locks and Dams 1-26, showed 35 active colonies of five species of larger waterbirds (great blue heron, great egret, black-crowned night heron, double-crested cormorant, and Forster's tern) nesting in the floodplain. In addition, green he...

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Bibliographic Details
Main Authors: Thompson,David H, Landin,Mary C
Format: Report
Language:English
Subjects:
BIRDS
Civil Engineering
COLONIES(BIOLOGY)
DAMS
DREDGED MATERIALS
ECOSYSTEMS
FLOOD PLAINS
Habitats
Herons
LAND USE
LOCKS(WATERWAYS)
LPN-DMRP-4F01F
MISSISSIPPI RIVER
NESTING(ANIMALS)
SHOREBIRDS
SITE SELECTION
SURVEYS
Waterbirds
Wetlands
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Summary:Aerial surveys of 1040 km of the Upper Mississippi River, Locks and Dams 1-26, showed 35 active colonies of five species of larger waterbirds (great blue heron, great egret, black-crowned night heron, double-crested cormorant, and Forster's tern) nesting in the floodplain. In addition, green herons and yellow-crowned night herons are reported as nesting, although location by aerial survey was not possible due to cryptic coloration and nest placement beneath the tree canopy. No species were found nesting on dredged material. In general, colonies were located on isolated insular natural sites on the east side of the river below dams and/or tributaries. Dredged material sites were found to be unsuitable for nesting because of high human recreational use of dredged material and the early succession of vegetation stages present. (Author) Report on Dredged Material Research Program.