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Wood Turtle (Glyptemys insculpta)
Wood turtles (Clemmys insculpta), a Threatened species in Wisconsin, prefer clean rivers and streams with moderate to fast flows and adjacent riparian wetlands and upland deciduous forests. This species often forages in open wet meadows or in shrub-carr habitats dominated by speckled alder. They overwinter in streams and rivers in deep holes or undercut banks where there is enough water flow to prevent freezing. This semi-terrestrial species tends to stay within about 300 meters of rivers and streams but exceptions certainly occur, especially within the driftless area of southwestern and western Wisconsin. This species becomes active in spring as soon as the ice is gone and air temperatures reach around 50 degrees in March or April. They can remain active into mid-October but have been seen breeding under the ice. Wood turtles can breed at any time of year, but primarily during the spring or fall. Nesting usually begins in late May in northern WI and early June in southern WI and continues through June. This species nests in sand or gravel, usually very close to the water, although it is known to nest along sand and gravel roads or in abandoned gravel pits some distance from water. Hatching occurs in 55-75 days (August) depending on air temperatures. This species does not overwinter in nests, unlike other WI turtles. See the species guidance document for avoidance measures and management guidance from the Natural Heritage Conservation Program.
Status and Natural Heritage Inventory documented occurrences in Wisconsin
The table below provides information about the protected status - both state and federal - and the rank (S and G Ranks) for Wood Turtle (Glyptemys insculpta). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where this species has been found to date and is not meant as a range map.
|Federal Status in Wisconsin||none|
|Tracked by NHI||Y|
This document contains identification and life history information for Wood Turtle. It also describes how to screen projects for potential impact to this species, lists avoidance measures, and provides general management guidance.
Links to additional Wood Turtle information
- Grassland and Savanna Protocols
- Michigan Natural Features Inventory
- NatureServe Explorer information
Other links related to reptiles
Photos / Video
Wildlife Action Plan
Information from Wisconsin's Wildlife Action Plan.
Native community (habitat) associations
The table below lists the natural communities that are associated with Wood Turtle. Only natural communities for which Wood Turtle is "significantly" (score=3) or "moderately" (score=2) associated are shown. Please see the Wildlife Action Plan to learn how this information was developed.
Ecological landscape associations
The table below lists the ecological landscape association scores for Wood Turtle. The scores correspond to the map (3=High, 2=Moderate, 1=Low, 0=None). For more information, please see the Wildlife Action Plan.
Landscape-Community combinations of highest ecological priority*
Ecological priorities are the combinations of natural communities and ecological landscapes that provide Wisconsin's best opportunities to conserve important habitats for a given Species of Greatest Conservation Need. The 10 highest scoring combinations are considered ecological priorities and are listed below. More than 10 combinations are listed if multiple combinations tied for 10th place. For more information, please see the Wildlife Action Plan.
* Ecological priority score is a relative measure that is not meant for comparison between species. This score does not consider socio-economical factors that may dictate protection and/or management priorities differently than those determined solely by ecological analysis. Further, a low ecological priority score does not imply that management or preservation should not occur on a site if there are important reasons for doing so locally.
- Allow natural stream erosion and deposition processes to operate (which provide nesting sites), protect riparian buffer zones, and manage streams overall for best water quality practices.
- Control recreational access to communal breeding sites during nesting season.
- Education is needed where wood turtles are being harvested for food.
- Long term monitoring is needed to evaluate population status and track trends of representative populations. Nest site monitoring is the most feasible.
- Minimize sediment pollution and pesticide loading throughout the watershed to improve aquatic habitats and water quality.
- Permanent protection of important communal breeding sites and surrounding habitat is needed.
- Permanent protection of shorelines and buffers is needed throughout the range.
- Research is needed to determine effective ways to protect nests and improve recruitment rates.
- Three general wood turtle conservation recommendations are: a) protect wood turtles from exploitation (for food, biological supply, and pets); b) accurately determine and monitor distribution and status, especially of nest areas; and c) incorporate wood t
- Wildlife habitat in general is poorly represented in zoning and planning and major strides are needed in policy and education here.
Threats and issues
- Dams can impede natural erosion and deposition processes in streams and negatively impact nesting opportunities by stabilizing banks and sand bars.
- Habitat loss and degradation from shoreline and other development in riparian corridors are a threat to this species.
- Clear cutting and development within 50 meters of streams can damage primary habitat and stream water quality.
- Over-collecting prior to Threatened-species designation and poaching appear to be locally significant sources of mortality.
- Invasive plants such as reed canary grass and giant reed grass may decrease shoreline habitat suitability.
- Invasive aquatic animals such as zebra mussels and bythotrephes change productivity pathways and food web dynamics in aquatic systems.
- A variety of potential problems related to water quality and aquatic invertebrate communities are poorly studied. Mercury, acid rain, road salt, and nutrient loads could all impact wood turtle prey availability.
- Recreation can disturb nesting, especially trout fisherman and canoeists utilizing sand bars and eroded banks in June.
- Road mortality can be locally significant where nesting on or along sandy roads occurs.
- Increased nest predation rates for this communal denning species may be seriously limiting population maintenance and recovery, resulting from unnaturally high populations of human subsidized predators (coyotes, raccoons, skunks, fox, etc.).