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For information on Wisconsin's Ecological Landscapes, contact:
Andy Stoltman
608-266-9841

Southwest Savanna Ecological Landscape

Landscape at a Glance


Physical & Biotic Environment

Size

1,950 square miles (1,248,126 acres); 3.5% of the land area of Wisconsin.

Climate

Typical of southern Wisconsin; the mean growing season is 153 days, mean annual temperature is 45.6 deg. F, mean annual precipitation is 35.2, and mean annual snowfall is 39.9 inches. However, the Southwest Savanna has the fourth longest growing season, the most precipitation, the third lowest snowfall, and second warmest January low temperature among Ecological Landscapes in the state. The climate tends to be warmer in the southwestern part of the state, which affects the ecology of the Southwest Savanna and also makes it suitable for most agricultural uses. 80% of this Ecological Landscape is devoted to row crops, small grains, and pastures.

Bedrock

The Southwest Savanna Landscape is underlain by sedimentary bedrock, especially dolomites and sandstones.

Geology & Landforms

The Southwest Savanna is part of Wisconsin's Driftless Area, a region that has not been glaciated for at least the last 2.4 million years. The topography is characterized by broad, open ridgetops, deep valleys, and steep, wooded slopes.

Soils

Soils on hilltops are silt loams mostly silt loams. In some areas soils are shallow, with bedrock or stony red clay subsoil very close to or at the surface. In other locales the ridgetops have a deep cap of loess-derived silt loam (these are the most productive agricultural soils). Valley soils include alluvial sands, loams, and occasionally, peats.

Hydrology

The drainage patterns of streams in the Southwest Savanna are dendritic, which is a pattern characteristic of unglaciated regions but absent or uncommon in most of Wisconsin. Flowing waters include warmwater rivers and streams, coldwater streams, and springs. Natural Lakes are virtually absent, though there are a few associated with the floodplains of the larger rivers. Natural lakes are rare but there are a few in the floodplains of the larger rivers, such as the Pecatonica. Impoundments and reservoirs have been constructed on some rivers and streams, and check dams have been built in ravines to hold storm and snow runoff.

Current Landcover

Agricultural crops (corn, soybeans, small grains, hay) cover 70% of this Ecological Landscape, with lesser amounts of grassland (mostly pasture), forest, and residential areas. The major forest types are oak-hickory and maple-basswood. Prairie remnants of varying quality persist in a few places, mostly on rocky hilltops or slopes that are too steep to farm. Some pastures have never been plowed, and those that historically supported prairie may retain remnants of the former prairie flora. Pastures with scattered open-grown oaks still exist in some areas, mimicking oak savanna structure. A complement of native plants persists in some of these pastured savannas.

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Socioeconomic Conditions
(based on data from Iowa, Grant, Lafayette, and Green counties)

Population

123,899, 2.2% of the state total

Population Density

39 persons/ sq. mile

Per Capita Income

$28,795

Important Economic Sectors

Retail trade (15.2%); government (14.0); agriculture, fishing & hunting (13.8%); and manufacturing (non-wood) (9.1%) were the most important sectors in 2007 reflecting high dependence on retail trade, government and agriculture. Agriculture and residential development have the largest impact on the natural resources in the Ecological Landscape at this time.

Public Ownership

About 96.5% of the land in the Southwest Savanna is privately owned while 3.5% belongs to state, county, or municipal governments. State-owned lands include Parks, Wildlife Areas, Fisheries Areas, Natural Areas, and one Recreation Area. These include Belmont Mound, New Glarus Woods, and Yellowstone Lake State Parks; part of Blue Mounds State Park; Browntown-Cadiz Springs State Recreation Area; Hardscrabble Prairie State Natural Area; Mount Vernon Creek State Fishery Area; and Yellowstone Lake State Wildlife Area. A map showing public land ownership (county, state, and federal) and private lands enrolled in the Forest Tax Programs in this Ecological Landscape can be found at the end of this chapter.

Other Notable Ownerships

The Wisconsin Chapter of The Nature Conservancy has several active projects here, including Thomson Memorial Prairie and Barneveld Prairie. Three chapters of The Prairie Enthusiasts (Southwest Wisconsin, Empire-Sauk, and Prairie Bluff) have been very active in this Ecological Landscape and have at least 10 projects underway in the Southwest Savanna. Pheasants Forever and the National Wild Turkey Federation are also very active in this Ecological Landscape.

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Considerations for Planning & Management

The need for partnerships between government agencies, NGOs, and private individuals are critical as less than 1% of the Ecological Landscape is publicly owned. Coordinated management of large areas will be difficult because of ownership patterns and the prevalence of intensively used agricultural land. Remnant prairies and savannas are small and often isolated, but in a few areas there are opportunities to develop partnerships that will accommodate a mix of active cropland, pasture, conservation reserve program lands, and reserves that feature high quality prairie and savanna remnants or other habitats known to be especially important to rare or otherwise sensitive species, including streams. The Southwest Wisconsin Grassland and Stream Conservation Area, a cooperative project involving many public and private partners, encompasses one of the best locations to accomplish this and is an excellent place in which to focus some of the grassland protection efforts at larger scales.

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Species

Species of Greatest Conservation Need

The content for this page came from the Wisconsin Wildlife Action Plan

The following species are listed according to their probability of occurring in the Southwest Savanna Ecological Landscape, based on the findings in the Wisconsin Wildlife Action Plan.

Scores: 3 = "Significantly Associated," 2 = "Moderately Associated," and 1 = "Minimally Associated."
BirdsScore
Bell's VireoVireo bellii3
BobolinkDolichonyx oryzivorus3
Brown ThrasherToxostoma rufum3
DickcisselSpiza americana3
Eastern MeadowlarkSturnella magna3
Field SparrowSpizella pusilla3
Grasshopper SparrowAmmodramus savannarum3
Henslow's SparrowAmmodramus henslowii3
Northern BobwhiteColinus virginianus3
Red-headed WoodpeckerMelanerpes erythrocephalus3
Short-eared OwlAsio flammeus3
Upland SandpiperBartramia longicauda3
Vesper SparrowPooecetes gramineus3
Western MeadowlarkSturnella neglecta3
Willow FlycatcherEmpidonax traillii3
American Golden PloverPluvialis dominica2
Black-billed CuckooCoccyzus erythropthalmus2
Blue-winged TealAnas discors2
Blue-winged WarblerVermivora pinus2
Buff-breasted SandpiperTryngites subruficollis2
Loggerhead ShrikeLanius ludovicianus2
Northern HarrierCircus cyaneus2
Rusty BlackbirdEuphagus carolinus2
Solitary SandpiperTringa solitaria2
Wood ThrushHylocichla mustelina2
Yellow-billed CuckooCoccyzus americanus2
Acadian FlycatcherEmpidonax virescens1
American WoodcockScolopax minor1
Bald EagleHaliaeetus leucocephalus1
Barn OwlTyto alba1
Black-throated Blue WarblerDendroica caerulescens1
CanvasbackAythya valisineria1
DunlinCalidris alpina1
Horned GrebePodiceps auritus1
Hudsonian GodwitLimosa haemastica1
Least FlycatcherEmpidonax minimus1
Lesser ScaupAythya affinis1
Marbled GodwitLimosa fedoa1
Red-shouldered HawkButeo lineatus1
Short-billed DowitcherLimnodromus griseus1
WhimbrelNumenius phaeopus1
Whip-poor-willCaprimulgus vociferus1

Scores: 3 = "Significantly Associated," 2 = "Moderately Associated," and 1 = "Minimally Associated."
FishScore
Slender MadtomNoturus exilis3
Gravel ChubErimystax x-punctatus2
Ozark MinnowNotropis nubilus2
Black BuffaloIctiobus niger1
Redside DaceClinostomus elongatus1

Scores: 3 = "Significantly Associated," 2 = "Moderately Associated," and 1 = "Minimally Associated."
Reptiles and AmphibiansScore
Northern Cricket FrogAcris crepitans3
Pickerel FrogRana palustris3
Gray RatsnakePantherophis spiloides1
MudpuppyNecturus maculosus1

Scores: 3 = "Significantly Associated," 2 = "Moderately Associated," and 1 = "Minimally Associated."
MammalsScore
Eastern Red BatLasiurus borealis2
Franklin's Ground SquirrelSpermophilus franklinii2
Northern Long-eared BatMyotis septentrionalis2
Prairie VoleMicrotus ochrogaster2
Woodland VoleMicrotus pinetorum2
Hoary BatLasiurus cinereus1
Silver-haired BatLasionycteris noctivagans1
Water ShrewSorex palustris1
White-tailed JackrabbitLepus townsendii1

Community opportunities

Natural community management opportunities

The Southwest Savanna Ecological Landscape contains opportunities to manage for the following natural communities, based on the findings in the Wildlife Action Plan (originally presented by the Ecosystem Management Team).


Description of Terms Used to Define Opportunities for Protection, Restoration and/or Management of Natural Communities by Ecological Landscapes

Major
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
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
The natural community occurs in the Ecological Landscape, but better management opportunities appear to exist in other parts of the state.

General opportunities

General management opportunities 1

The Southwest Savanna was once dominated by fire-dependant natural communities representing the continuum of prairie, oak savanna, oak woodland and oak forest. Now dominated mostly by agricultural lands, and with less than one percent in public ownership, this landscape still offers good opportunities to maintain expansive grassland and savanna habitats through public / private partnerships. Restoration and management of the entire continuum of fire-dependent natural communities native to southern Wisconsin is possible here.

This is arguably Wisconsin's best ecological landscape to manage grasslands at large scales. Native grasslands are rare here, as they are throughout the upper Midwest. However, some of the scattered remnants support rare plants, invertebrates, herptiles, birds and other animals. In addition, abundant surrogate grasslands can provide the scale needed by area-sensitive species and in some cases can connect isolated prairie patches. Large areas of surrogate grasslands can buffer prairie and savanna remnants from more intensively managed land, and there are sometimes opportunities to embed remnants within large acreages of CRP, fallow agricultural land, pasture, or cropland. The surrogate grasslands may also provide missing environmental gradients of soil types, soil moisture, slope and aspect, which may be needed for the vegetation to adapt to long-term environmental changes.

The Wisconsin Natural Resources Board recently approved a project that will protect and restore grassland and stream habitats in this Ecological Landscape: the "Southwest Wisconsin Grasslands and Streams Conservation Area." The project boundary encompasses high-priority grasslands, prairies, savanna remnants and watersheds across parts of southern Iowa, northern Lafayette, southwest Dane and far northwestern Green counties. This project represents major habitat management opportunities via numerous private-public partnerships.

Extensive areas of grazed but never plowed oak savanna occur at several locations in the Southwest Savanna. Survey needs include the identification of prairie remnants, unplowed prairie and savanna pastures and other sites with diverse native flora. Floristically diverse remnants adjoining or embedded within extensive surrogate grasslands will offer the best restoration and management opportunities.

Rivers and streams here afford opportunities to manage and conserve native aquatic species and their habitats as well as recreational opportunities. The identification of aquatic habitats known to support sensitive species provides a starting point on which to focus restoration and protection efforts. Some sites will offer good opportunities to merge terrestrial and aquatic conservation projects.

Miscellaneous management opportunities in the Southwest Savanna include scattered hardwood forests, conifer relicts, springs and spring runs and rare species populations. At some sites there are good opportunities to maintain, restore and manage these features, including restoration of oak forests that are succeeding to more shade and browse-tolerant species. Conifer relicts could be mapped and monitored. The long-term viability of these relicts, especially Hemlock Relicts, is unknown and needs further investigation.

1. The text presented here is a summarized version of a longer section developed for the Ecological Landscapes of Wisconsin Handbook.

LTAs

Southwest Savanna Landtype Associations

Landtype Associations (LTAs) are units of the National Hierarchical Framework of Ecological Units (NHFEU), a hierarchical ecological land classification system. LTAs are much smaller than Ecological Landscapes, ranging in size from 10,000 and 300,000 acres. In Wisconsin, they are usually based on glacial features like individual moraines or outwash plains. LTAs can be very useful for planning at finer scales within an Ecological Landscape.

The following are the LTAs associated with the Southwest Savanna Ecological Landscape. The Southwest Savanna LTA map [PDF] can be used to locate these LTAs. Clicking on an LTA in the list below will open a data table for that LTA in PDF format. Descriptions are included, where available.

Last Revised: January 23, 2012
Southwest Savanna Southern Lake Michigan Coastal Western Coulees and Ridges Southeast Glacial Plains Central Sand Hills Central Lake Michigan Coastal Central Sand Plains Northern Lake Michigan Coastal Northern Lake Michigan Coastal Northeast Sands Western Prairie North Central Forest Northern Highlands Northwest Lowlands Northwest Sands Northwest Lowlands Superior Coastal Plains Forest Transition