The North Chicago Wetland Mitigation Site serves as an important bird area for spring and fall migrants.
In Spring 2016 we conducted 21 person hours of line transect surveys and and 14.8 person-hours of intensive searches and detected:
– 90 bird species.
– No threatened and endangered species.
– Possible breeding populations of American Woodcock, Sedge Wren, and Willow Flycatcher.
The most common species were
– American Robins
– Red-winged Blackbirds
– Song Sparrows
Substantial populations were found of
– Brown-headed Cowbirds
– Common Grackles
– Common Yellowthroats
– Willow Flycatchers
– Yellow Warblers
Summer bird densities were high compared to sites in our larger study.
During fall of 2016, we conducted 22.96 hours of line transect surveys and detected:
– 67 species
– Northern Harrier – Endangered Species
– Brown Creeper – Forest Listed Species
The most commonly detected species were:
– Red-winged Blackbird
– American Goldfinch
– American Robin
– Song Sparrow
Substantial numbers of migrating Palm Warblers were also found.
Continued monitoring will help us further understand how bird communities during spring, summer, and fall may be affected by ongoing restoration efforts. In future fieldwork seasons, we will continue to derive seasonal density estimates of birds for between-years comparisons. Continued monitoring will allow us to better assess to what extent NCWMS functions as an effective preserve for resident and migratory birds.