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Minnesota-Wisconsin Core Subregon (Focal Areas GL4–GL6; Figures 3–44 and 3–45; Table 3–12)
General Description
This subregion supports approximately 61% of
the region’s (and 58% of the world’s) Goldenwinged
Warblers. The primary habitats for
Golden-winged Warblers in these focal areas are
shrub wetlands and young aspen forest. Major
threats in these areas are the decline of evenaged
forest management (conversion to northern
hardwood forest and agencies falling short of
aspen harvest goals), forest fragmentation by
Macro Landscape Context (within 1.5 mi (2.5 km) of management site)
Golden-winged Warblers are generally associated with landscapes containing:
3–70
second-home development, and Blue-winged
Warbler encroachment (especially in the Central
Forest of Wisconsin). There is a high potential for
creating young forest and for protecting shrub
wetland communities, and enhancing these
communities through active management.
Additionally, there is potential for overlapping
management with Sharp-tailed Grouse within this
subregion.
• The following primary land cover types: 22% herbaceous and 70% forest cover that is
predominantly 33–82 ft (10–25 m) in height (large sapling to small sawtimber sized trees).
• A ratio of 70:30 deciduous:coniferous trees with low or no Golden-winged Warbler occurrence
in forested landscapes containing greater than 35% coniferous forest.
• Tree communities dominated by balsam poplar, aspen, or paper birch with trees that are 16–33
ft (5–10 m) tall (sapling-sized trees).
Micro Landscape Context (within 0.15 mi (0.25 km) of management site):
Sites where Golden-winged Warblers are found generally contain:
• The following primary land cover types: deciduous forest (44%); woody wetlands (20%);
emergent herbaceous wetlands (6%), shrub-scrub (6%). Blue-winged Warblers used very similar
habitats (only ±2–3% different in each category).
Table 3–12. Population and habitat goals for focal areas in the Minnesota-Wisconsin Core subregion.*
Focal
Area
Map
ID Focal Area Name
Northern Minnesota and
GL4
Wisconsin
Estimated
Population
for 2010
(individuals)
Population
Goal for
2050
(individuals)
Estimated
Breeding
Habitat for 2010
in acres (ha)
Breeding
Habitat Goal
for 2050 in
acres (ha)
226,000 339,000 1,130,000 (457,000) 1,695,000 (685,900)
GL5 Wisconsin Central Forest 5000 7500 25,000 (10,000) 37,500 (15,200)
GL6
Northeast Wisconsin and
Upper Peninsula Michigan
8000 12,000 40,000 (16,000) 60,000 (24,000)
*Population estimates are based on expert knowledge and Golden-winged Warbler Atlas Project data.