Root River turtles

by Greg Mayer

A couple of Sundays ago, June 17, 2018, my wife and I took a paddle along the Root River, in Racine, WI. Starting out at the Root River Environmental Center (REC), we went upstream, around the island in Island Park, and back down to the REC. Along the way we saw quite a few turtles– 15-20, although at least a few were the same turtles seen going both up and back.

Here, a shelled reptile and a glorified reptile share a tree trunk in mid stream.

Female mallard and map turtle in Root River, Racine, WI, 17 June 2018.

On the next picture, it’s a bit of “spot the turtle”– the smaller one is inconspicuous. Both these two and the one in the previous picture appear to be map turtles (Graptemys). These turtles are typically more riverine than lacustrine, and thus might be expected in the river, except that the Root River is outside the range of map turtles, which occur in Illinois to the south and along the larger rivers of western Wisconsin. The map turtles of southeast Wisconsin are almost certainly introduced. What species they are is not clear to me. The species-level taxonomy of map turtles is not completely worked out, especially down South, where each river that drains into the Gulf of Mexico seems to have a more or less distinctive population of map turtles.

Two map turtles in Root River, Racine, WI, 17 June 2018.

Although it might be natural to think that one of the midwestern species was introduced into southeast Wisconsin, southern turtles can be found in the pet trade, and there may be more than one species present in the Root River. (In Kenosha, just south of Racine, I’ve seen at least two map turtle species.) It’s not known if they are breeding, and if so, whether different forms are crossing. I did find a hatchling in Kenosha, but I can’t rule out– in fact I lean toward– the possibility that it was released, rather than bred, there.

This next turtle is definitely a map turtle. Note the hint of serration or knobs on the shell along the midline, and the white neck markings.

Map turtle in Root River, Racine, WI, 17 June 2018.

The next turtle is a snapping turtle (Chelydra serpentina), hauled out on the island in Island Park. It’s not a very good picture– that’s its tail you’re looking at– as the turtle slipped into the water as we maneuvered for a better shot, but snapping turtles so rarely bask on land that I though it worth showing. (They often float right at the surface, which is their usual way of ‘basking’.)

Snapping turtle on island in Island Park, Root River, Racine, WI, 17 June 2018.

The species we saw the most of were midland painted turtles (Chrysemys picta marginata), which, like snapping turtles, are more of a pond than river species. The Root River is shallow and slow-moving, though, so the conditions are fairly pond-like. You can tell it’s the midland subspecies because the seams between the costal (‘rib’) scutes don’t line up with the seams between the vertebral scutes

Painted turtle in Root River, Racine, WI, 17 June 2018.

We saw a bunch, but the gal above let us get the closest, so she gets a closeup. (You can tell it’s a she by the large size and the short ‘fingernails’– males are smaller, and have longer front claws.)

Painted turtle in Root River, Racine, WI, 17 June 2018.

We did see two or three of southeast Wisconsin’s classic native river turtle, the smooth softshell (Apalone mutica). They are baskers, but very skittish, and thus hard to approach. I was using a 55-200 zoom lens on this trip, and got a decent picture of one. Notice that the ‘log’ it is on is actually an old piling or dock piece– note the bolt, nut, and metal plate.

Smooth softshell turtle in Root River, Racine, WI, 17 June 2018.

Finally, towards the end of our two-hour paddle, we encountered what I believe to be the same two map turtles we saw at the start of the trip, who are in the first picture above– it is the same log. Sexual size dimorphism is stronger in map turtles than painted turtles, so this could be a female and a male.

Two map turtles on the Root River, Racine, WI, 17 June 2018.

The possible male dove first, but we got close enough to see the neck markings and hint of dorsal serration in the probable female. Of the two native map turtles in western Wisconsin, the plain old map turtle, Graptemys geographica, is less serrated than the false map turtle, Graptemys pseudogeographica, so this would be a geographica, except that the two Wisconsin species aren’t the only possibilities. (One of the two map turtle species I’ve seen in Kenosha is definitely a ‘white-eyed’ southern form.)

A probable plain old map turtle on the Root River, Racine, WI, 17 June 2018.

Given that it’s a small river hemmed in by human development on all sides, with a past history of industrial usage, four species of turtle, all reasonably abundant– all with multiple sightings during the trip, except for the snapper, which, as a non-basker, is often not seen– is actually a decent amount of biodiversity.

8 Comments

  1. Mark R.
    Posted July 1, 2018 at 3:23 pm | Permalink

    What a great place to have a paddle, thanks for sharing your adventure photos. Turtles are one of my favorite animals, definitely my favorite reptile.

    Now I have Red-eared sliders in a greenhouse pond, but growing up I had map, painted, snapping and soft-shell turtles. Turtles make great pets- just don’t let them loose in the wild.

  2. W.T. Effingham
    Posted July 1, 2018 at 3:40 pm | Permalink

    It’s nice to see a post about a stretch of river on the mend. A harbinger of hope for Turtlekind.

  3. Randall Schenck
    Posted July 1, 2018 at 3:56 pm | Permalink

    Where I use to live in southwest Iowa we had a river, bayou and lake on the place so turtles were everywhere. I could not guess the population in the lake but it had to be in the hundreds or thousands in 25 acres of water. The snappers are pretty angry and grow very large. In the summer the march of the turtles begin as the females come out to lay their eggs. I have no idea what percentage of laid eggs make it back to the water but raccoons dig them up about as fast as the turtles lay them.

  4. Posted July 1, 2018 at 5:05 pm | Permalink

    Thanks for that! I grew up on the Root River in southern Milwaukee county where it passes through Whitnall Park. Lots of wildlife!

  5. Posted July 1, 2018 at 5:11 pm | Permalink

    Interesting stuff! In the early summer here I keep encountering lakeside patches of bare soil mixed with scraps of reptile eggs. I suppose that these are likely turtle nesting sites.

  6. christopher
    Posted July 2, 2018 at 12:40 am | Permalink

    Great post. The world in general and WEIT specifically needs more of the Chelonian kind. Graptemys is confusing but beautiful. I would love to delve deeper into the taxonomy and get a good grasp of the genus but I lack the education and probably the intellect.

  7. Glenda Palmer
    Posted July 2, 2018 at 10:55 am | Permalink

    Thank you for great photos and notes.

  8. Posted July 2, 2018 at 4:57 pm | Permalink

    +1


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