ADVERTISEMENT

ADVERTISEMENT

Wood turtles declining in Minnesota

New federal grant aids effort to save species from extirpation.

060521.O.DNT.woodturtlesC1
A wood turtle carries a transmitter that allows researchers from UMD's Natural Resources Research Insitute to track its movements. (Steve Kuchera / 2016 / News Tribune)
We are part of The Trust Project.

The news for wood turtles in Minnesota is not good.

According to the Minnesota Department of Natural Resources’ Wood Turtle Habitat Conservation Plan, finalized in 2020, declining population trends for the reptile are cause for concern and they are in danger of disappearing from the region entirely.

“Some populations are dominated by older adult turtles with little evidence of juvenile recruitment,’’ the plan notes. “Overall, populations are generally small, isolated and at risk for extirpation.”

And it’s not just a Minnesota problem. The International Union for the Conservation of Nature has classified wood turtles as endangered across their range — the Northeastern U.S. and eastern Canada — since 2010.

Wood turtles were once common in most of eastern Minnesota, from St. Louis County in the north to the Iowa border. They thrived in areas with sandy shorelines along rivers with plenty of forest nearby.

ADVERTISEMENT

But wood turtles spend more time on land than most other Minnesota turtles, and that makes them more vulnerable to humans — namely vehicles on roads and habitat loss from waterfront development. Adult female wood turtles spend a good portion of their summer and fall on land eating berries, worms, mushrooms and insects, sometimes miles from their favorite river.

Not only are there fewer undeveloped sandy shoreline places to lay their eggs, but nests that are made are more often being destroyed by predators like fox, raccoons, skunks and coyotes. In one study by researchers at UMD’s Natural Resources Research Institute virtually every wood turtle nest egg was dug up and eaten.

And not only are there fewer wood turtles making it to adulthood but more adult turtles are dying, and researchers aren’t sure why. Surveys conducted from 2016 to 2018 found a “substantial decrease in the number of individuals at eight monitoring sites coinciding with a large number of dead turtles of unknown cause found at the same sites.”

The estimated number of wood turtles at those eight sights in eastern Minnesota plummeted from 247 in 2016 to just 88 by 2018.

PREVIOUSLY: Wood turtle researchers step in to help NORTH OF DULUTH -- About 200 yards off a railroad grade, researcher Maddy Cochrane waved her antenna in a semicircle to hear the strongest beep on her VHF radio receiver, then bolted off in that direction.
The good news is that turtle experts from the DNR and NRRI continue studying wood turtles thanks to a big federal wildlife grant. Minnesota is splitting $1 million with Iowa, Wisconsin and Michigan to keep tracking wood turtles and their habitat and to develop projects that actually increase their population.

The federal grant, with state matching money from the Minnesota Nongame Wildlife Fund, is helping wildlife experts determine which actions work best to help wood turtles recover — things like developing flood-safe nesting areas, protecting nests from predators, installing barriers to keep turtles off roads and enhancing foraging habitat.

John Myers reports on the outdoors, natural resources and the environment for the Duluth News Tribune. You can reach him at jmyers@duluthnews.com.
What to read next
Members Only
Conducted every five years since 1990, the survey originally was scheduled for the summer of 2020 but was postponed because of the COVID-19 pandemic.
The border between Minnesota and Wisconsin here was formed by a combination of molten lava and melting glaciers over the past billion years. The St. Croix River Valley's hugely popular public access site features hikes along the bluffs and down to the river, and ways to see these stunning rock cliffs from water level.
Improper handling of fish increases the odds they may swim away, but die.
This holiday weekend looks to feature generally lighter winds and a few chances of showers and thunderstorms.