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Map showing the Northwest Sands Ecological Landscape
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For information on Wisconsin's Ecological Landscapes, contact:
Andy Stoltman
608-266-9841

Southwest Savanna Ecological Landscape

Download the Southwest Savanna chapter [PDF] of the Ecological Landscapes of Wisconsin. This chapter provides a detailed assessment of the ecological and socioeconomic conditions for the Southwest Savanna. It also identifies important planning and management considerations and suggests management opportunities that are compatible with the ecology of the landscape. The tabs below provide additional information.

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.  Learn more from the chapter [PDF]

Bedrock

The Southwest Savanna Landscape is underlain by sedimentary bedrock, especially dolomites and sandstones.  Learn more from the chapter [PDF]

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.  Learn more from the chapter [PDF]

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.  Learn more from the chapter [PDF]

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.  Learn more from the chapter [PDF]

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.  Learn more from the chapter [PDF]

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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.  Learn more about management opportunities from the chapter [PDF]

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Species

Wisconsin Wildlife Action Plan graphic

Species of Greatest Conservation Need

The following species are listed according to their probability of occurring in the Southwest Savanna Ecological Landscape, based on the findings in Wisconsin's 2015 Wildlife Action Plan.


AmphibiansScore
Blanchard's Cricket FrogAcris blanchardi3
Pickerel FrogLithobates palustris3

Ants, wasps, and beesScore
American Bumble BeeBombus pensylvanicus2
Silphium Terminal Gall WaspAntistrophus silphii2
An Anthophorid BeeNeolarra vigilans1
A Cuckoo BeeEpeolus ainsliei1
Rusty-patched Bumble BeeBombus affinis3
Yellow Bumble BeeBombus fervidus1

Aquatic and terrestrial snailsScore
Cherrystone DropHendersonia occulta2
Wing SnaggletoothGastrocopta procera2
Hubricht's VertigoVertigo hubrichti1
Smooth CoilHelicodiscus singleyanus1
Brilliant GranuleGuppya sterkii1
Dull GlossZonitoides limatulus1
Broad-banded ForestsnailAllogona profunda2

BeetlesScore
Sandy Stream Tiger BeetleEllipsoptera macra1
Ghost Tiger BeetleEllipsoptera lepida1
A Leaf BeetleAltica litigata1
Virginia Big-headed Tiger BeetleTetracha virginica1
A Predaceous Diving BeetlePlatambus confusus2
A Predaceous Diving BeetleNeoporus hybridus3
A Hydroporus Diving BeetleHeterosternuta wickhami3
A Riffle BeetleStenelmis antennalis1
A Riffle BeetleStenelmis musgravei3
A Water Scavenger BeetleCymbiodyta toddi3
A Water Scavenger BeetleAgabetes acuductus2
A Pear-shaped WeevilSayapion segnipes1
A Pear-shaped WeevilCoelocephalapion decoloratum1
A Pear-shaped WeevilTrichapion perforicolle1
A Leaf BeetleCryptocephalus cuneatus2
A Leaf BeetleSaxinis omogera1
A Leaf BeetlePachybrachis atomarius2
A Leaf BeetlePachybrachis peccans1
A Predaceous Diving BeetleCybister fimbriolatus3

BirdsScore
Red-shouldered HawkButeo lineatus1
Northern BobwhiteColinus virginianus3
Upland SandpiperBartramia longicauda3
American WoodcockScolopax minor1
Long-eared OwlAsio otus1
Short-eared OwlAsio flammeus3
Common NighthawkChordeiles minor2
Eastern Whip-poor-willAntrostomus vociferus1
Red-headed WoodpeckerMelanerpes erythrocephalus2
Acadian FlycatcherEmpidonax virescens1
Least FlycatcherEmpidonax minimus1
Purple MartinProgne subis1
Loggerhead ShrikeLanius ludovicianus2
Bell's VireoVireo bellii3
Cerulean WarblerSetophaga cerulea1
Worm-eating WarblerHelmitheros vermivorum1
Kentucky WarblerGeothlypis formosa1
Yellow-breasted ChatIcteria virens3
DickcisselSpiza americana3
Vesper SparrowPooecetes gramineus3
Grasshopper SparrowAmmodramus savannarum3
Henslow's SparrowAmmodramus henslowii3
BobolinkDolichonyx oryzivorus3
Eastern MeadowlarkSturnella magna3
Western MeadowlarkSturnella neglecta3
Rusty BlackbirdEuphagus carolinus2

Butterflies and mothsScore
Ottoe SkipperHesperia ottoe2
Cross Line SkipperPolites origenes1
Regal FritillarySpeyeria idalia3
Gorgone Checker SpotChlosyne gorgone1
Abbreviated Underwing MothCatocala abbreviatella2
Whitney's Underwing MothCatocala whitneyi1
A Noctuid MothBagisara gulnare2
A Noctuid MothDichagyris reliqua1
Leadplant Flower MothSchinia lucens1

Dragonflies and damselfliesScore
Sioux (Sand) SnaketailOphiogomphus smithi1
Royal River CruiserMacromia taeniolata1
Plains EmeraldSomatochlora ensigera1
Hine's EmeraldSomatochlora hineana1
Clamp-tipped EmeraldSomatochlora tenebrosa1
Spangled SkimmerLibellula cyanea1
Springwater DancerArgia plana1

FishesScore
Ozark MinnowNotropis nubilus2
Gravel ChubErimystax x-punctatus2
Black BuffaloIctiobus niger1
Black RedhorseMoxostoma duquesnei1
Slender MadtomNoturus exilis3
Least DarterEtheostoma microperca1

Grasshoppers and alliesScore
Blue-legged GrasshopperMelanoplus flavidus1
Grizzly Spur-throat GrasshopperMelanoplus punctulatus1
Stone's LocustMelanoplus stonei1
Scudder's Short-winged GrasshopperMelanoplus scudderi1
A Spur-throat GrasshopperMelanoplus foedus2
Gladston's Spur-throat GrasshopperMelanoplus gladstoni1
Seaside GrasshopperTrimerotropis maritima2
Spotted-winged GrasshopperOrphulella pelidna2
Bog ConeheadNeoconocephalus lyristes3
Delicate Meadow KatydidOrchelimum delicatum1
Black-striped KatydidScudderia fasciata1
Speckled Rangeland GrasshopperArphia conspersa1
Plains Yellow-winged GrasshopperArphia simplex2
Handsome GrasshopperSyrbula admirabilis3
Ash-brown GrasshopperTrachyrhachys kiowa2
Green-streak GrasshopperHesperotettix viridis2
Showy GrasshopperHesperotettix speciosus1
Mermiria GrasshopperMermiria bivittata1
Club-horned GrasshopperAeropedellus clavatus2
Short-winged GrasshopperDichromorpha viridis3
Velvet-striped GrasshopperEritettix simplex1
Obscure GrasshopperOpeia obscura2

Leafhoppers and true bugsScore
A Seed BugSlaterobius quadristriata1
A LeafhopperFlexamia prairiana1
Red-tailed Prairie LeafhopperAflexia rubranura2
A LeafhopperPrairiana kansana2
A LeafhopperPrairiana cinerea2
A LeafhopperPrairiana angustens2
A LeafhopperParaphlepsius altus1
A LeafhopperParaphlepsius nebulosus2
A LeafhopperAttenuipyga vanduzeei2
A LeafhopperLaevicephalus vannus2
Prairie LeafhopperPolyamia dilata3
An Issid PlanthopperBruchomorpha extensa2
An Issid PlanthopperFitchiella robertsonii1
A LeafhopperKansendria kansiensis3
A LeafhopperCuerna sayi2
A LeafhopperDriotura robusta2
A LeafhopperMemnonia panzeri3
A PlanthopperMyndus ovatus2
Yellow Loosestrife LeafhopperErythroneura carbonata2

MammalsScore
Water ShrewSorex palustris1
Little Brown BatMyotis lucifugus3
Northern Long-eared BatMyotis septentrionalis2
Silver-haired BatLasionycteris noctivagans1
Eastern PipistrellePerimyotis subflavus2
Big Brown BatEptesicus fuscus3
Franklin's Ground SquirrelPoliocitellus franklinii2
Prairie Deer MousePeromyscus maniculatus bairdii3
Prairie VoleMicrotus ochrogaster1
Woodland VoleMicrotus pinetorum2

MayfliesScore
A Brush-legged MayflyHomoeoneuria ammophila1
A Common Burrower MayflyPentagenia vittigera3
Pecatonica River MayflyAcanthametropus pecatonica3
A MayflyAmeletus lineatus1
A Small Minnow MayflyParacloeodes minutus2
A Flat-headed MayflyMacdunnoa persimplex3
Fox Small Square-gilled MayflyCercobrachys fox3
Winnebago Small Square-gilled MayflyCercobrachys winnebago1
Wisconsin Small Square-gilled MayflyCercobrachys lilliei2

Mussels and clamsScore
ElktoeAlasmidonta marginata1

ReptilesScore
Blanding's TurtleEmydoidea blandingii2
Western WormsnakeCarphophis vermis1
North American RacerColuber constrictor3
Gray RatsnakePantherophis spiloides1
GophersnakePituophis catenifer1
Plains GartersnakeThamnophis radix1
Lined SnakeTropidoclonion lineatum3
Timber RattlesnakeCrotalus horridus1

Community opportunities

Wisconsin Wildlife Action Plan graphic

Natural community management opportunities

The Southwest Savanna Ecological Landscape contains opportunities to manage for the following natural communities, based on the findings in the 2015 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.

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