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Natural communities
Explore Wisconsin's natural communities.
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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

Lake--Meromictic

Need a main photo for this community

State Rank: S1     Global Rank: GNR   what are these ranks?

Definition

General natural community overview

Small lakes (<10 acres) that are typified by extreme relative depth in relation to surface area. These factors in addition to watershed soils and its protection from surrounding uplands result in Meromictic Lakes never "turning over" as the water temperature changes in the spring and fall as is typical of most other Wisconsin lakes. Instead, these lakes stay stratified, creating unusual chemical and biological layers. There are very few known examples of this lake type in Wisconsin, making them difficult to characterize in terms of vegetation associates. Meromictic Lakes do not support fish.

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 Lake--Meromictic 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
Blanchard's Cricket FrogAcris blanchardi3
Mink FrogLithobates septentrionalis3
Pickerel FrogLithobates palustris2

BirdsScore
Black TernChlidonias niger2
Common GoldeneyeBucephala clangula2
Common TernSterna hirundo1
Forster's TernSterna forsteri1

Dragonflies and damselfliesScore
Double-striped BluetEnallagma basidens3
Lake EmeraldSomatochlora cingulata3
Lilypad ForktailIschnura kellicotti3
Mottled DarnerAeshna clepsydra3
Pronghorn ClubtailGomphus graslinellus3
Slaty SkimmerLibellula incesta3
Spatterdock DarnerRhionaeschna mutata3
Unicorn ClubtailArigomphus villosipes3
Painted SkimmerLibellula semifasciata2
Spangled SkimmerLibellula cyanea2
Subarctic DarnerAeshna subarctica1

FishesScore
Redfin ShinerLythrurus umbratilis1

MammalsScore
Big Brown BatEptesicus fuscus3
Little Brown BatMyotis lucifugus3
Northern Long-eared BatMyotis septentrionalis2
Silver-haired BatLasionycteris noctivagans2
Eastern PipistrellePerimyotis subflavus1
Water ShrewSorex palustris1

ReptilesScore
Blanding's TurtleEmydoidea blandingii3
Eastern RibbonsnakeThamnophis sauritus3
Western RibbonsnakeThamnophis proximus1
Wood TurtleGlyptemys insculpta1

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

Landscapes

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


Map of the Ecological Landscapes of Wisconsin.

Ecological LandscapeOpportunity
North Central ForestMajor
Northern HighlandPresent

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

Photos

There are no photos available for Lake--Meromictic at this time. Please consider donating a photo to the Natural Heritage Conservation Program.

Last revised: Monday, November 14, 2016