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For information on Wisconsin's natural communities, contact:
Ryan O'Connor
Natural Heritage Inventory Assistant Ecologist
608-266-7714

Shrub-carr

State Rank: S4     Global Rank: G5   what are these ranks?

Definition

General natural community overview

Counties shaded blue have documented occurrences for Shrub-carr in the Wisconsin Natural Heritage Inventory database.

This wetland community is dominated by tall shrubs such as red-osier dogwood (Cornus sericea), silky dogwood (Cornus amomum), meadowsweet (Spiraea alba), and various willows (Salix spp.). Canada bluejoint grass (Calamagrostis canadensis) is often very common. Associates are similar to those found in alder thickets and tussock-type sedge meadows. This type occupies areas that are transitional between open wetlands such as wet prairie, calcareous fen, or southern sedge meadow, and forested wetlands such as floodplain forest or southern hardwood swamp. Shrub-carr can persist at a given site for a very long time if natural hydrologic cycles are maintained. This type often occurs in bands around lakes or ponds, on the margins of river floodplains, or, more extensively, in glacial lakebeds. It is common and widespread in southern Wisconsin but also occurs in the north. In the south, Shrub-carr was often an integral part of prairie-savanna landscapes, though it also occurred in wetlands within more forested regions. In the north, the landscape matrix around the shrub-carr type was usually upland forest. Statewide, Shrub-carr remains quite common, and has fared considerably better than many of the other native wetland types within its range.

Past drainage and marsh hay mowing likely had a negative effect on Shrub-carr, whereas clearing of conifer swamps likely produced more of this habitat. Once fire was controlled and hay mowing was discontinued in lowland meadows, Shrub-carr likely increased in extent. Drainage of meadows and marshes has also allowed shrub-carr habitats to increase in some areas. As a result of wetland drainage and fire suppression, Shrub-carr now occupies many sites that formerly supported much more extensive marsh, wet meadow, prairie, and fen vegetation, and therefore, it is sometimes targeted for elimination. However, it is an important native wetland type that has its place on our landscape and should be protected, managed, and restored at appropriate locations.

Rare animals

Species of Greatest Conservation Need

Wisconsin Wildlife Action Plan graphic

The following Species of Greatest Conservation Need are listed according to their level of association with the Shrub-carr natural community type, based on the findings in Wisconsin's 2015 Wildlife Action Plan.

Scores: 3 = significantly associated, 2 = moderately associated, and 1 = minimally associated.

AmphibiansScore
Four-toed SalamanderHemidactylium scutatum3
Mink FrogLithobates septentrionalis2
Pickerel FrogLithobates palustris2

Aquatic and terrestrial snailsScore
Wing SnaggletoothGastrocopta procera1

BirdsScore
American WoodcockScolopax minor3
Golden-winged WarblerVermivora chrysoptera3
Bell's VireoVireo bellii2
Rusty BlackbirdEuphagus carolinus2
Yellow-breasted ChatIcteria virens2
Yellow-crowned Night-HeronNyctanassa violacea2
American BitternBotaurus lentiginosus1
Black-crowned Night-HeronNycticorax nycticorax1
Brewer's BlackbirdEuphagus cyanocephalus1
Greater Prairie-ChickenTympanuchus cupido1
Least FlycatcherEmpidonax minimus1
Loggerhead ShrikeLanius ludovicianus1
Olive-sided FlycatcherContopus cooperi1
Sharp-tailed GrouseTympanuchus phasianellus1
Short-eared OwlAsio flammeus1

Butterflies and mothsScore
A Noctuid MothBagisara gulnare1
Midwestern Fen BuckmothHemileuca nevadensis ssp. 31

Grasshoppers and alliesScore
Bog ConeheadNeoconocephalus lyristes1
Bruner's Spur-throat GrasshopperMelanoplus bruneri1
Delicate Meadow KatydidOrchelimum delicatum1
Spotted-winged GrasshopperOrphulella pelidna1

MammalsScore
Little Brown BatMyotis lucifugus2
Northern Long-eared BatMyotis septentrionalis2
Silver-haired BatLasionycteris noctivagans2
Eastern PipistrellePerimyotis subflavus1
Water ShrewSorex palustris1
Woodland Jumping MouseNapaeozapus insignis1

ReptilesScore
Butler's GartersnakeThamnophis butleri3
Eastern MassasaugaSistrurus catenatus3
QueensnakeRegina septemvittata3
Western RibbonsnakeThamnophis proximus3
Wood TurtleGlyptemys insculpta3
Blanding's TurtleEmydoidea blandingii2
Eastern RibbonsnakeThamnophis sauritus2
Plains GartersnakeThamnophis radix2

Please see Section 2. Approach and Methods of the Wildlife Action Plan to learn how this information was developed.

Rare plants

The Natural Heritage Inventory has developed scores indicating the degree to which each of Wisconsin's rare plant species is associated with a particular natural community or ecological landscape. This information is similar to that found in the Wildlife Action Plan for animals. As this is a work in progress, we welcome your suggestions and feedback.

Scores: 3 = "significantly associated," 2 = "moderately associated," and 1 = "minimally associated."
Scientific Name Common Name Score
Agrimonia parviflora Swamp Agrimony 1
Galium brevipes Swamp Bedstraw 2
Poa paludigena Bog Bluegrass 2
Ranunculus gmelinii Small Yellow Water Crowfoot 2
Salix planifolia ssp. planifolia Tea-leaved Willow 2
Thalictrum revolutum Waxleaf Meadowrue 1
Thalictrum venulosum Veined Meadowrue 2
Valeriana edulis var. ciliata Hairy Valerian 1
Viburnum cassinoides Northern Wild-raisin 3

Landscapes

The following Ecological Landscapes have the best opportunities to manage for Shrub-carr, based on the Ecological Landscapes of Wisconsin Handbook.


Map of the Ecological Landscapes of Wisconsin.


Major (3 on map)
A major opportunity for sustaining the natural community in the Ecological Landscape exists, either because many significant occurrences of the natural community have been recorded in the landscape or major restoration activities are likely to be successful maintaining the community's composition, structure, and ecological function over a longer period of time.

Important (2 on map)
Although the natural community does not occur extensively or commonly in the Ecological Landscape, one to several occurrences do occur and are important in sustaining the community in the state. In some cases, important opportunities may exist because the natural community may be restricted to just one or a few Ecological Landscapes within the state and there may be a lack of opportunities elsewhere.

Present (1 on map)
The natural community occurs in the Ecological Landscape, but better management opportunities appear to exist in other parts of the state.

Threats/Actions

Wisconsin Wildlife Action Plan graphic

What are conservation actions?

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the WWAP because lack of information can threaten our ability to successfully preserve and care for natural resources.

Threats/issues and conservations actions for natural communities

Considerations

The following are additional considerations for Shrub-carr in Ecological Landscapes with opportunities for protection, restoration, and/or management. For more information, see the Wildlife Action Plan.

Central Lake Michigan Coastal

Examples of this community type can be found at Duvall Swamp (Kewaunee County), Kohler-Andrae State Park (Sheboygan County), and Mud Lake (Waupaca County). Shrub-carr habitat should be maintained where it exists.

Central Sand Hills

Examples of shrub-carr can be found at the Germania Marsh State Wildlife Area, Lawrence Creek State Wildlife Area, and Harris Marsh in Marquette County. Beaver populations should be maintained at an appropriate level in this Ecological Landscape to prevent conversion of shrub-carr communities.

Central Sand Plains

Examples of this community type can be found at Quincy Bluff and Wetlands State Natural Area, Colburn State Wildlife Area, Meadow Valley State Wildlife Area, and many additional locations on other public lands. In this Ecological Landscape there is the potential to manage this community type in very large wetland complexes with northern sedge meadow, open bog, poor fen, alder thicket, and tamarack swamp. Beaver populations should be maintained at an appropriate level in this Ecological Landscape to prevent conversion of shrub-carr communities. Hydrologic alterations are pervasive in this landscape, especially ditching and impoundment construction. More care needs to be taken to ensure that many good examples of this and other native wetland communities are protected from type conversion, degradation, or outright loss.

Forest Transition

Examples of this community type can be found at Ninemile Swamp (Marathon County) and along the Wisconsin River and its tributaries.

North Central Forest

Examples of this community type can be found at locations within the Chequamegan-Nicolet National Forest, and on other public lands such as the Lincoln and Ashland County Forests. Alder thicket is the more common wet shrub community in this landscape. Invasives are not a large problem at present, but should be monitored. Beaver populations should be maintained at an appropriate level in this Ecological Landscape to prevent conversion of shrub-carr communities.

Northern Lake Michigan Coastal

Examples of this community type can be found at the Green Bay West Shores State Wildlife Area, the Lake Noquebay Wildlife Area, and at various locations on the Door Peninsula. Beaver populations should be maintained at an appropriate level in this Ecological Landscape to prevent conversion of shrub-carr communities. In the past, residential development has tended to encroach on wetlands during periods of low water. Maintenance of healthy wetland ecosystems and all of their associated communities is highly dependent on maintaining them during both high and low water. Shoreline development is an especially important land use issue here.

Southeast Glacial Plains

Examples of this community type can be found at Cedarburg Bog (Ozaukee County), Cherokee Marsh (Dane County), White River Marsh State Wildlife Area, Mullet Lake Swamp (Fond du Lac County), and at scattered locations within the Southern Unit of the Kettle Moraine State Forest. Drainage for agriculture, grazing, and conversion to reed canary grass monotypes are significant problems in this Ecological Landscape. Efforts to limit these activities would be beneficial. This is a widespread and common type here and would appropriately be featured in regional wetland protection and habitat restoration plans.

Southern Lake Michigan Coastal

Shrub-carr occurs at Chiwaukee Prairie State Natural Area (Kenosha County), at Cherry Lake Sedge Meadow (Racine County), at Bong State Recreation Area, and along the Des Plaines River. It is not a featured community at any of these locations, but exists as a component of a community mosaic.

Superior Coastal Plain

Examples of this community type can be found at Bibon Swamp State Natural Area (Bayfield County) and in the Superior Municipal Forest (Douglas County). Beaver populations should be maintained at an appropriate level in this Ecological Landscape to prevent conversion of shrub-carr communities. Most of the shrub swamp acreage in this Ecological Landscape is alder thicket.

Western Coulee and Ridges

Most occurrences of this type are associated with floodplains of the major rivers. Examples can be found at Tiffany Bottoms State Wildlife Area (Buffalo County), Upper Mississippi River Fish and Wildlife Refuge, Avoca Prairie State Natural Area (Iowa County), and along the Lower Wisconsin State Riverway.

Photos


Shrub-carr Photos

Shrub-carr Photo

Shrub-carr, Crooked Lake, Kettle Moraine State Forest - Northern Unit Sheboygan County.

Photo by Eric Epstein.

Shrub-carr Photo

Extensive, willow dominated Shrub-carr community, in a Flambeau River alough. Chequamegon-Nicolet National Forest (Park Falls District), Price County.

Photo by Eric Epstein.

Shrub-carr Photo

Buttonbush (Cephalanthus occidentalis) thicket in rich shrub-carr. Hook Lake Bog State Natural Area, Dane County.

Photo by Eric Epstein.

Shrub-carr Photo

A diverse shrub-carr community borders this ecologically important stretch of the East Branch of the Milwaukee River. Northern Kettle Moraine region, Fond du lac County.

Photo by Eric Epstein.

Note: photos are provided to illustrate various examples of natural community types. A single photograph cannot represent the range of variability inherent in a given community type. Some of these photos explicitly illustrate unusual and distinctive community variants. The community photo galleries are a work in progress that we will expand and improve in the future.

Last revised: Monday, November 14, 2016