4/15/2024 0 Comments Us bird population density map![]() ![]() ![]() Recent Breeding Bird Atlas work also documented fewer breeding attempts in southern Wisconsin compared to the north. Robbins (1991) cited this species as being a fairly common to common summer resident in central and northern Wisconsin respectively, but rare in the south. BBS and Chequamegon National Forest Bird Survey data indicate a non-significant annual increase, but data from the Nicolet National Forest Bird Survey suggest an insignificant decrease (Sauer et al. In Wisconsin, population trend data are somewhat more equivocal. Breeding Bird Survey (BBS) data suggest a significant annual decline range-wide for Chestnut-sided Warblers (Sauer et al. While the Chestnut-sided Warbler increased its range and density after forest clearing in the 1800s, recent declines (post-1960) have been noted in some areas of North America (Richardson and Brauning 1995). The Chequamegon/Nicolet National Forest, Northern Highland/American Legion State Forest, and Douglas, Lincoln, and Marinette county forests are important breeding areas. In the extensive forests of northern Wisconsin, early-successional habitats are less limited due to the prevalence of logging activities in the region. In central Wisconsin, this species is mostly associated with county forests and state wildlife management areas in Clark, Eau Claire, Jackson, Marathon, and Shawano counties. This is especially concerning in southern Wisconsin where agricultural and urban expansion has limited suitable habitat to just a few scattered locations, including the Baraboo Hills (Mossman and Lange 1982) and Kettle Moraine State Forest. The early successional habitats favored by this species are increasingly threatened by human development. Historically, it was abundant throughout Wisconsin (Kumlien and Hollister 1903) but is now concentrated in the northern third of the state (Gostomski 2006). The Chestnut-sided Warbler expanded its range following the extensive forest cutting of eastern North America, being one of the few Neotropical migrants that has benefited from human activities (Richardson and Brauning 1995). ![]() Temple (1988) estimated 65 hectars to be the minimum size required for 50% occupancy in southern Wisconsin. The Chestnut-sided Warbler prefers relatively large tracts of habitat. In Wisconsin, it breeds in early-successional deciduous woodlands dominated by hardwood shrubs, saplings, or scattered trees and open clearings with a brushy understory (Robbins 1991, Gostomski 2006). Tree species composition appears less important than forest structural features however, Robbins (1991) reported Chestnut-sided Warblers to be largely absent from conifers. Breeding Habitat: Oak, Scrub Oak, Aspen, Alder Thicket, Shrub-Carr, White Pine, Forested Ridge and Swale.to the Atlantic Coast, extending south into the Appalachian states (Richardson and Brauning 1995). Breeding Range: Saskatchewan east across southern Canada and the northern U.S.WSO Checklist Project: significant increase (1983-2007).Nicolet National Forest Bird Survey (UWGB): significant decline (Howe and Roberts 2005).Chequamegon National Forest Bird Survey (NRRI) : non-significant increase (1992-2005).Federal Breeding Bird Survey (BCR 12): non-significant decline.Federal Breeding Bird Survey (BCR 23): non-significant decline.Federal Breeding Bird Survey (WI): non-significant increase.Federal Breeding Bird Survey: significant decline.Federal BBS information can be obtained at by clicking on Trend Estimates and selecting the species in question. ![]()
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