Be on the watch for turtles as we move into spring and summer…




Don Lyman holds a large snapping turtle at  Lowell-Dracut-Tyngsboro State Forest.

Posted Jun  01, 2010 @ 10:00 AM

Over the next month or so, from the end of May until the end of June, female  turtles will leave their watery hangouts and trek overland in search of a spot  to lay their eggs.

Massachusetts has 10 species of native turtles — painted, snapping, musk,  red-bellied, bog, spotted, Blanding’s, wood, box and diamondback terrapins (and  one exotic species, the red-eared slider). Except for the box turtle, which is a  terrestrial or land turtle, and the diamondback terrapin, which lives in salt  marshes, all of our turtles live in fresh water environments.

From diminutive 4-inch-long musk turtles to 60-pound snapping turtles, if  you live or work near a pond, stream, swamp or other wetland, you’re likely to  see one of these reptiles crossing a road or parking lot, or digging a nest hole  in an open field or vacant lot, or even in your yard.

Turtle nests consist of a hole in the ground, which female turtles dig with  their hind feet. They tend to choose patches of bare soil, which is easy to dig  in, in open areas like fields or yards where the nests will get plenty of  sunlight to incubate the eggs. For example, a conservation officer for a town  north of Boston told me recently that Blanding’s turtles, which are a threatened  species in Massachusetts, like to nest in the sandy soil on the town’s soccer  field. During nesting season the part of the soccer field where the turtles dig  their nests has to be cordoned off until the baby turtles hatch in late August  and early September.

Smaller turtles, like bog or musk turtles, may only lay four or five eggs.  Bigger turtles, like Blanding’s or snapping turtles, may lay a dozen or more.  After she’s finished laying her eggs, the female turtle fills in the nest hole  and covers the eggs by pushing the loose soil she’s excavated back into the hole  with her hind feet. The eggs usually hatch anywhere from two to three months  after being laid.

Interestingly, the sex of the hatchlings is determined by temperature, with  warmer soil temperatures typically producing female offspring and cooler soil  temp’s producing male offspring, although this can vary depending on the  species.

Threats to turtle eggs include mammals like raccoons, skunks, opossums and  rats, which will dig up the nests and eat the eggs, according to Kerry Muldoon,  Conservation Commission biologist for the city of New Bedford. Muldoon adds that  even plants can pose a threat to turtle eggs. She says the roots of beach grass  and saltmarsh cordgrass can penetrate and destroy the eggs of diamondback  terrapins, which she studied while in graduate school. Hatchling turtles  likewise fall prey to a variety of animals including mammals, birds and even  ants.

Many adult turtles are hit by cars as they cross roads in search of nest  sites or when they attempt to nest in open areas along the edges of roads.  Turtles also sometimes nest in the open, sandy and gravelly soil next to  railroad tracks where they may be hit by trains or become trapped between the  rails. Biologist Tim Beaulieu says he found about a dozen or more turtle nests  along a 100-foot section of railroad track behind a small pond while conducting  a biology survey for reptiles and amphibians in a suburban area west of Boston a  couple of years ago. Unfortunately, Beaulieu said, all the nests had been  destroyed by predators. Additionally, Beaulieu said he found the remains of  several adult painted and snapping turtles trapped between the rails.

Turtle eggs and hatchlings have a high mortality rate and only a small  percentage of turtles ever reach adulthood. Because of this low survival rate,  says the Massachusetts Division of Fisheries and Wildlife website on turtles,  “…a turtle must live for many years and reproduce many times in order to  replace themselves in their population. Losing any adult turtles, and  particularly adult females, is a serious problem that can tragically lead to the  eventual local extinction of a population.”

The Massachusetts Division of Fisheries and Wildlife’s Natural Heritage and  Endangered Species Program is working with the Massachusetts Department of  Transportation on a new program called the Turtle Roadkill Monitoring Project to  locate turtle roadkill hotspots. Its goal is to identify and monitor problem  road crossing sites for turtles. The program is asking for public’s help to  identify potential turtle roadkill hotspots in your town, working to confirm the  spots with project coordinators, then help conduct road surveys at these sites  during designated time periods in May and June.

In addition to roadkill hotspots, Mass. Fisheries and Wildlife and the  Turtle Conservation Project are asking the public to submit information on  locations where multiple turtles nest, as well as to report sightings of  individual turtles.

If you should find a female turtle nesting in your yard, Mass. Fisheries and  Wildlife says the best thing to do is to keep people and animals away from the  area until she’s done nesting, which can take several hours. Also, remember that  turtles can deliver a painful bite and, in the case of large snapping turtles,  can inflict serious wounds. Half a dozen of Massachusetts’ native turtle species  are state listed as endangered, threatened, or species of special concern. Other  than snapping, painted and musk turtles, it is illegal to capture and keep wild  turtles as pets in Massachusetts. It’s also important never to release  store-bought turtles into the wild, as they may transmit diseases to wild turtle  populations.

Turtles have been around since before the time of the dinosaurs and they  play an important role in the environment as predators, herbivores and prey.

“Aquatic turtles often represent a very high proportion of animal biomass in  wetlands they occupy, therefore making them very important in wetland food  webs,” says Dr. Hal Avery, a biology professor and turtle researcher at Drexel  University in Philadelphia. “Turtles occupy many trophic levels (an organism’s  feeding position in a food web),” says Avery, “from primary consumers  (herbivores) to top carnivores.”

Turtles also play an important role in limiting herbivore populations,  according to Avery, which helps maintain the stability of entire ecosystems and  ecological communities. “For example,” says Avery, “without diamondback  terrapins, Spartina (the dominant salt marsh plant) salt marshes would be  overgrazed and lost to mollusc grazers.”

Avery, his colleague professor Jim Spotila and other researchers from Drexel  University, in conjunction with volunteers coordinated through the nonprofit  organization Earthwatch, have been conducting a long-term research project at  New Jersey’s Barnegat Bay for several years now, studying the ecology of  diamondback terrapins and the effects of humans on these turtles. The  researchers are discovering that commercial fishing, shoreline development,  pollution, the hazards of roads and motor vehicles, and even boat noise all take  their toll on turtles.

“Because they occupy some of the most biologically diverse and productive  ecosystems in the world,” says Avery, “and because they utilize aquatic and  terrestrial habitats within these ecosystems, aquatic turtles are paramount  indicators of ecosystem function, making them important model organisms to study  in conservation biology.”

Unfortunately many species of turtles are threatened due to habitat  destruction, pollution, roads and other hazards. But research being carried out  by scientists, as well as programs like those being conducted by Mass. Fisheries  and Wildlife, and citizen involvement in turtle conservation efforts, can help  ensure that turtles will continue to be around to play their important roles in  the environment, and for future generations to observe and enjoy as part of our  natural heritage.

Don Lyman is an adjunct instructor in the Biology Department at Merrimack  College in North Andover.

Find out more:

Massachusetts Turtle Roadkill Monitoring Project:

Turtle Conservation Project:

Earthwatch Barnegat Bay Diamondback Terrapin Project:

Read more:


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