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

Open Bog

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

Definition

General natural community overview

Counties shaded blue have documented occurrences for Open Bog in the Wisconsin Natural Heritage Inventory database.

Bogs are acidic, low nutrient, northern Wisconsin peatlands dominated by Sphagnum mosses that occur in deep layers and accumulate over time as peat. The bog surface is often uneven, with pronounced hummock and hollow microtopography. In northern Wisconsin, bogs are frequently found in the kettle depressions of pitted outwash and morainal landforms. They also frequently occur on the borders of lakes that have low nutrient inputs. Vascular plant diversity is very low in the most acidic sites, but includes characteristic and distinctive specialists such as the narrow-leaved sedge species (Carex oligosperma and C. pauciflora), cotton-grasses (Eriophorum spp.), and ericaceous shrubs, especially leatherleaf (Chamaedaphne calyculata), bog laurel (Kalmia polifolia), bog rosemary (Andromeda polifolia), and small cranberry (Vaccinium oxycoccos). Trees are absent or stunted and achieve very low cover values.

In the strictest sense, bogs receive nutrients only from precipitation and limited internal runoff. The thick layers of sphagnum isolate the bog from the influence of nutrient enriched groundwater, and create an environment characterized by high acidity, low oxygen and nutrient levels, and inhabited by a limited number of highly specialized plants that are able to tolerate or thrive in the extreme conditions. Poor fen, open bog, and muskeg often occupy different parts of the same wetland basin, which may include one or more types of lowland coniferous forest as well. Each of these communities responds to slight differences in local site conditions.

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 Open Bog 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 septentrionalis3
Pickerel FrogLithobates palustris2

Ants, wasps, and beesScore
Confusing Bumble BeeBombus perplexus1
Frigid Bumble BeeBombus frigidus1
Indiscriminate Cuckoo Bumble BeeBombus insularis1

Aquatic and terrestrial snailsScore
Deep-throated VertigoVertigo nylanderi2
Six-whorl VertigoVertigo morsei2

BeetlesScore
A Burrowing Water BeetleHydrocanthus iricolor2
A Minute Moss BeetleHydraena angulicollis1

BirdsScore
American BitternBotaurus lentiginosus3
Yellow RailCoturnicops noveboracensis3
American Black DuckAnas rubripes2
Olive-sided FlycatcherContopus cooperi2
Rusty BlackbirdEuphagus carolinus2
Whooping CraneGrus americana2
American WoodcockScolopax minor1
Black TernChlidonias niger1
Black-backed WoodpeckerPicoides arcticus1
Connecticut WarblerOporornis agilis1
Henslow's SparrowAmmodramus henslowii1
Sharp-tailed GrouseTympanuchus phasianellus1
Spruce GrouseFalcipennis canadensis1

Butterflies and mothsScore
Arctic FritillaryBoloria chariclea3

CaddisfliesScore
A Giant Casemaker CaddisflyBanksiola dossuaria2
A Phryganeid CaddisflyBeothukus complicatus2

Dragonflies and damselfliesScore
Forcipate EmeraldSomatochlora forcipata3
Subarctic DarnerAeshna subarctica3
Incurvate EmeraldSomatochlora incurvata2
Ringed BoghaunterWilliamsonia lintneri2
Zigzag DarnerAeshna sitchensis2

Grasshoppers and alliesScore
Crackling Forest GrasshopperTrimerotropis verruculata2
Spotted-winged GrasshopperOrphulella pelidna2

Leafhoppers and true bugsScore
A LeafhopperLimotettix pseudosphagneticus2

MammalsScore
Little Brown BatMyotis lucifugus2
Northern Long-eared BatMyotis septentrionalis2
Silver-haired BatLasionycteris noctivagans2
Big Brown BatEptesicus fuscus1
Eastern PipistrellePerimyotis subflavus1
Water ShrewSorex palustris1
Woodland Jumping MouseNapaeozapus insignis1

ReptilesScore
Eastern MassasaugaSistrurus catenatus3
Eastern RibbonsnakeThamnophis sauritus3
Blanding's TurtleEmydoidea blandingii1
Plains GartersnakeThamnophis radix1

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
Pseudevernia consocians Common Antler Lichen 3

Landscapes

The following Ecological Landscapes have the best opportunities to manage for Open Bog, 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 Open Bog in Ecological Landscapes with opportunities for protection, restoration, and/or management. For more information, see the Wildlife Action Plan.

Central Sand Hills

Hydrologic changes due to residential development and road building are an issue. Agricultural practices adjacent to this community can result in soil erosion and water quality degradation due to sedimentation and nutrient loading.

Central Sand Plains

Hydrologic changes due to drainage, dike construction, residential development, commercial cranberry operations, and road building have all impacted this community type. The Dewey Marsh in Portage County contains extensive tracts of open bog, poor fen and muskeg within a large, diverse wetland complex on managed and partially protected public land. Other examples of bog habitats occur on the Black River State Forest (Jackson County) and Meadow Valley Wildlife Area (Juneau County).

Forest Transition

Smaller open bogs associated with lakes are common. Residential and agricultural developments are concerns, as is habitat fragmentation. The community has been affected by changing site hydrology, wetland filling, and type conversion.

North Central Forest

Boggy habitats are widespread and common in this Ecological Landscape, usually associated with other wetland types. Increased pressure from motorized recreation is causing some impact (i.e., spread of invasive species such as purple loosestrife and phragmites).

Northeast Sands

This community type is usually found in association with smaller lakes in this Ecological Landscape. Population and road density are lower within this Ecological Landscape resulting in fewer impacts to this community. However, motorized recreation is on the increase and may enhance the spread of invasive species such as purple loosestrife. Best Management Practices and sustainable forest management should be used near this community.

Northern Highland

There is extensive representation of this community type in this Ecological Landscape, with numerous small and large open bogs and muskegs. The Powell Marsh and the vast peatlands along the Manitowish River (Vilas and Oneida counties), and Thunder Marsh in Oneida County contain good representatives of this and related communities. These three areas are found mostly on public land. Road density in this Ecological Landscape is higher per square mile than in other northern Ecological Landscapes, and has impacted hydrology in several locations. Development adjacent to this community is causing some impacts to hydrology due to wetland filling and road construction. Commercial cranberry operations have altered some of this community. Increased pressure from motorized recreation is causing some impact (i.e., spread of invasive species such as purple loosestrife and phragmites). Best Management Practices and sustainable forest management adjacent to this community should be used.

Northwest Lowlands

The open bog complexes are large within this Ecological Landscape. Human populations and road densities are lower within this Ecological Landscape than many other places and have less impacts to this community type. Black Lake Bog, and the Empire and Belden Swamps (all in Douglas County) contain extensive bogs within large wetland complexes that are intact and well preserved. Increased pressure from motorized recreation is causing some impact (i.e., spread of invasive species such as purple loosestrife and phragmites).

Northwest Sands

This type is commonly found in the kettle depressions of pitted outwash landforms, often associated with lakes. Human populations and road densities are low but increasing in this Ecological Landscape, especially in the lake districts. Some small but high quality open bogs and poor fens exist and are now protected on the Brule River State Forest. There are some excellent kettle bogs in the Chequamegon-Nicolet National Forest (Douglas and Bayfield Counties).

Superior Coastal Plain

A complex ecosystem of open bog (though somewhat limited in size) within a wetland matrix of other peatland communities exists within the Apostle Islands archipelago. Some of this community in the archipelago is preserved in the National and State Park system and is being affected adversely by recreational uses. On the mainland, the Kakagon Sloughs on the Bad River Indian Reservation maintains smaller portions of an intricate open bog community in relation to the many quality wetland community types in the area. Though somewhat isolated from other open bog communities, it is well preserved. Sultz Swamp (Bayfield County) is one of the largest acid peatlands (with minimal disturbance) in the Lake Superior basin that contains an open bog community as part of the wetland complex. Though invasive plants may not be a serious problem for this type at the present time, there are scattered invasions of purple loosestrife, phragmites and reed canary grass. These invasives are usually present in areas that have been disturbed in some way.

Photos


Open Bog Photos

Open Bog Photo

Open bog adjoining a pond in the Flambeau River State Forest.

Photo by Emmet Judziewicz.

Open Bog Photo

Open bog swale on bayside of Long Island. Apostle Islands National Lakeshore, Ashland County.

Photo by Eric Epstein.

Open Bog Photo

Open Bog, part of Great Lakes Ridge and Swale system. Long Island, Apostle Island National Lakshore, Ashland County.

Photo by Eric Epstein.

Open Bog Photo

Open Bog, part of Great Lakes Ridge and Swale system. Long Island, Apostle Island National Lakshore, Ashland County.

Photo by Eric Epstein.

Open Bog Photo

Open bog on east side of Grandma Lake. Grandma Lake Wetlands State Natural Area, Florence County.

Photo by Eric Epstein.

Open Bog Photo

Peatand complex with areas of open bog and black spruce forest . Leatherleaf and sphagnum dominate the open bog portion. Powell Marsh, Iron County.

Photo by Eric Epstein.

Open Bog Photo

Unnamed bog north of Hwy 70, Northern Highlands State Forest, Vilas 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