Posts Tagged ‘the last terrapins’

Northeast Diamondback Terrapin Working Group Meets at Wellfleet Bay Wildlife Sanctuary

Saturday, September 27th, 2008

Mass Audubon’s Wellfleet Bay Wildlife Sanctuary hosted the 3rd annual meeting of the Northeast Diamondback Terrapin Working Group on September 27th.  Bob Prescott, sanctuary director, and Don Lewis, the Turtle Guy, welcomed more than 30 participants from New England and New York.  Chuck Landrey coordinated the meeting agenda, and Russ Burke, Hofstra University professor, chaired the meeting.

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Particpants Assemble in Wellfleet Bay Wildlife Sanctuary Auditorium

After registration and coffee, the meeting kicked off at 10:00 am with opening remarks by Chuck Landrey, the northeast regional coordinator, followed by Russ Burke, DTWG chair.  Bob Prescott and Don Lewis welcomed participants to the Wellfleet Bay Wildlife Sanctuary and presented a very brief overview of Cape Cod geography and terrapin populations from the SouthCoast to the Outer Cape.  Russ topped off the opening session with an update on terrapin research activities within Jamaica Bay and the challenges of wildlife conservation within bounds of the 11th largest city in the world.

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Opening Presentations by Chuck Landrey, Russ Burke, Bob Prescott & Don Lewis

As entertaining as these opening presentations were, participants earned a nice break before hearing more research updates by Charlotte Sornborger of Barrington, Rhode Island, and Barbara Brennessel, professor at Wheaton College.  Eric Strauss, research associate professor at Boston College, talked about environmental studies and the ecological field station at Sandy Neck in Barnstable where he and Peter Auger have conducted long-term terrapin research.

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Second Round of Presentations by Charlotte Sornborger, Eric Strauss and Barbara Brennessel

Lunch break offered an opportunity for Sue Wieber Nourse and I to zip over to Lieutenant Island to check for emergence nests.  Three days of pouring rain and the tropical front accompanying Hurricane Kyle presented conditions favorable for late hatching terrapins to emerge through the soften soil.  At the intersection of a one lane dirt road and a driveway on Marsh Road, we discovered an emergence hole with a tiny diamondback terrapin hatchling poking its head out.  Excavating the egg chamber we rescued four live hatchlings and found two premature hatchlings that had been crushed inside the nest by vehicular traffic.

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Saving Turtles for Lunch from a Vulnerable Road Nest

The afternoon session was devoted to an exchange of information and views on a variety of terrapin research issues as enumerated by the following charts.  Topics included headstarting, how do hatchlings know home, list of predatory and beneficial plants, hatchling survival rate, relationship between age and salinity tolerance, unpublished data on diet, terrapins in captivity, legacy data sets, where do hatchlings hang out, starting a basic terrapin conservation program, capture-mark-recapture methods, tracking methods, mating aggregations, nest protector design and temperature, terrapin survey methods, and how do you know what terrapins are doing when not nesting.

Terrapin Research Topics of Interest to Participants

After a very long and productive day, during which Hurricane Kyle had deluged the auditorium windows and walls with rain, the time had come for a soagy field trip.  Participants assembled in the Nature Center and began the trek along Goose Pond Trail to Cape Cod Bay where we would release the female and male terrapins that Sue and I had captured on Wednesday (see The Last Terrapins).  Then, we would walk over to Try Island to check the remaining protected nests and to share an insight into nesting habitat here at the northernmost outpost for diamondback terrapins.

Bob Prescott (with Binoculars) Leads Participants Down Bayside Boardwalk

En route to the bay, we stopped by an exemplar area of salt marsh die-off to talk about this phenomenon on the Outer Cape.  I spotted a large male squareback marsh crab, one of the prime suspects in the die-off, guarding its muddy burrow.  Bob dove into the ooze and bare-handed the critter; a noble feat since we normally use 3-mil plastic gloves for this work due to the ferocious tenacity of these crabs.  Bob showed off his catch to clicks of rain-drenched cameras.

Bob Prescott Shows Large Male Squareback Marsh Crab to Conference Participants

As downpours resumed, we reached a creek leading to the bay and released our turtle guests back into the wild.  Afterwards, we examined the nesting habitat on Try Island and elsewhere along the Goose Pond Trail, arriving back at the Nature Center tired, soaked and completely satisfied with a most informative and fun filled day.

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Hurricane Kyle Field Trip at Wellfleet Bay Wildlife Sanctuary

The Last Terrapins

Thursday, September 25th, 2008

As September chill grips Cape Cod, terrapins head for winter slumber (brumation).  Only a few remain active late into the month and they become extremely difficult to find, less active and spending more of their time underwater, surfacing less frequently for air.

The Run in South Wellfleet

If you’re looking for turtles to sample this late in the month, one of the best places to try is the Run, a wide, shallow inlet south of Lieutenant Island linking many of the salt marsh channels where terrapins are known to brumate.  Wednesday’s weather was clear with a brisk northeast wind off the Atlantic Ocean.  The air temperature hovered around 60 and the water held in the mid to upper 50s.  My legs froze while Sue more intelligently chose waders over bathing attire.

Sue Wieber Nourse Captures Female Terrapin 2149

Low tide came a 2:30 pm.  In the Run, low tide marks the best chance to capture terrapins in the shallow, clearer water.  Our first capture was an 11-year-old female that Sue spotted as the turtle raced up channel toward the marsh creeks.  We had last observed this terrapin during field school on July 10th as she nested on a sandy bank just off Lieutenant Island.  Since then she had gained nearly 200 grams for the long winter ahead.

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Sue Wieber Nourse Hand-Netting Terrapins in the Run

Sue found the male terrapin, lazing motionless on the bottom.  it was the first time we had captured this male that measured 12 centimeters long and weighed a little under 300 grams; that is, about 3/4 the linear length and 1/3 the mass of the female.

Foul Weather Approaches the Outer Cape

With a meteorological depression heading for the Great White North tomorrow and Saturday forecast to pound the Outer Cape with rain and wind and cold, chances are that this adorable couple will be the last adult terrapins we will capture until field season returns in late April.  If history repeats, we will see a few more nests emerge until mid-October, and occasionally we will be confronted in the fall or in very early spring with a cold-stunned adult that didn’t find a particularly safe brumation site.  For our active collection program, though, the gavel has sounded for the 2008 field season.