Archive for the ‘Turtles’ Category

Breaking News — Grand Opening on Lieutenant Island

Wednesday, September 9th, 2009

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Diamondback Terrapin Hatchling Breaks Its Egg

You can’t make an omlette, and you can’t make hatchlings, without breaking a few eggs.  Yesterday, a nest of diamondback terrapin hatchlings on Lieutenant Island in South Wellfleet began to broil with activity.  These eggs were laid on June 24th in front of a very lucky group of Mass Audubon field school participants and had baked in the not too hot summer sun of 2009.  Today, they provide another once in a lifetime glimpse of a miracle that usually occurs far out of sight and hidden well beneath the steamy sands.  Now, you have a chance to see this mystery play out before your eyes.  For a sense of size perspective, those are grains of sand that dot the faces of these adorable critters.
 
Watch as baby turtles emerge from their eggshells to become the next generation of threatened diamondback terrapins in Wellfleet Bay.

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“So, This Is What the World Looks Like!”

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 Chorus Line

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“Hello, World!  Here I Come, Ready or Not.”

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Ups and Downs of Hatching 

 

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Breaking a Few Eggs, Terrapin Style

Diamondback Terrapin Hatchlings Begin to Emerge on Outer Cape

Monday, September 7th, 2009

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First Terrapin Hatchling of the 2009 Season

Tiny 1-inch long, 1/4 ounce terrapin hatchlings began to emerge from the September sands of Lieutenant Island in South Wellfleet on Saturday morning.  After a nesting season that was delayed two weeks by a cool and stormy spring, supplemented equally cool and rainy summer conditions that slowed down incubation, 41 hatchlings emerged from nests three weeks late in Saturday’s warmth and sunshine 

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Tiny, Dusty Hatchling Emerges from Dirt Road Nest

So, watch out below!  Keep a sharp eye on what moves along bayside dirt roads and driveways, and burrows from beneath dune sands from Barnstable to Wellfleet during September and early October.  That pebble rolling across the parking pad might be a turtle baby trying to scurry into the safety of nearby vegetation. 

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“Hey, I just hatched.  What did I do to deserve this ignominy?  Get me out of here!”

Diamondback terrapins are protected in the Commonwealth of Massachusetts as a threatened species.  Other turtle hatchling are emerging, too.  Eastern box turtle, spotted turtle, painted turtle and our perenial favorite snapping turtle hatchlings will be poking their heads out of ground in the next few weeks.  If you see a terrapin, don’t hesitate to call the 24/7 turtle hotline at 508-274-5108 to report the sighting.  If you’re unsure whether it’s a terrapin or a snapper, call any way.  The Turtle Journal Team is dedicated to saving the world, one turtle at a time.

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Hatchlings Emerge on Lieutenant Island

Rescuing Premature Hatchling from Lethal Predators Large and Small

Tuesday, September 1st, 2009

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Premature Diamondback Terrapin Hatchling

Topping off the worst summer season in more than a decade on Cape Cod, Tropical Storm Danny unloaded a deluge of rain on Saturday.  Turtle nesting was delayed ten days in spring and hatchling emergence has been retarded by at least two weeks due to cool temperatures and stormy weather throughout the season.  Sunday proved no different, with cool temperatures punctuated by more rain and dense fog.  With a hundred nests under our observation, not a single one hatched in August.  In normal years, hatching begins in mid-August and would have reached a furious pace by the end of the month.

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 Depredated Nest on Field Point in South Wellfleet

Predators have been as impatient as researchers about delayed emergence.  Dozens of nests have been dug up and eggs consumed.  Lieutenant Island’s Turtle Point looks like a war zone with “foxholes” dotting path and dunes.  Predators have even tunneled beneath excluder cages to reach protected nests.

On Sunday, we spotted a number of depredated nests at the eastern tip of Field Point off Blackfish Creek.  Our protocol demands a physical inspection of every depredated nests in order to collect research data about the number of eggs and so forth, but more importantly to determine whether any viable eggs might have been misssed by the hungry scavenger.  Sometimes an egg remains at the bottom of the nest when the predator becomes distracted by the frenzy of devouring the top layer of eggs.  It doesn’t occur often, perhaps once in every 25 depredated nests, but any hatchling rescued proves our motto of saving the world one turtle at a time.

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 Egg Left at Bottom of Depredated Nest on Field Point

When I excavated this depredated nest, I felt an egg buried under a shallow covering of sand beneath the carnage.  The shell had been nicked by the predator’s claws as it dug out the other eggs.  I got excited when the heft of the egg told me that it might contain a potentially viable hatchling.  I peeled back the nicked shell flap to look inside.

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Tiny Fly Larva inside Terrapin Egg

Good news and bad.  Lifting the flap I saw the carapace (top shell of the hatchling) and it appeared viable.  But then a tiny fly larva crawled across the shell and into my view. 

Flies are attracted by the odor of organic material that emanates from depredated nests and from hatching nests that have begun to pip.  Mature flies deposit eggs atop these nests. Fly larvae consume organic remnants of the depredation.  They also enter pipped eggs and devour hatchlings before they emerge.  In this case maggots had entered through the nicked shell and were feasting on the hatchling’s pierced membrane before they would move on to consuming her yolk sac and then the hatchling herself. 

Saving this animal would require immediate and aggressive action.

 

Rescuing Besieged Premature Hatchling

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Maggots had to be removed quickly before they wreaked irreversible damage.  We gently removed the shell to reach the fly larvae.  We bathed the premature hatchling in sterile water to flush the maggots.  Similarly we cleansed the shell itself.  With maggots eliminated, we re-inserted the premature hatchling back into its egg.  We placed the hatchling, now back inside her eggshell, on a blanket of moist paper towels to maintain her hydration, and we covered her with a slightly moist paper towel.

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Premature Terrapin Hatchling with Enormous Yolk Sac

While still alive and viable, this hatchling needs to absorb her huge yolk sac before she’s out of danger.  Still, her odds of survival have increased from zero to possible.  Right now she’s resting comfortably in our sun room as the day is bathed in bright September sunshine.

This rescued preemie is not what we expected for the First Hatchling of the 2009 season, but if she makes it, she’ll arguably be the luckiest hatchling that ever emerged from South Wellfleet.  She first dodged certain death at the claws and teeth of a large mammalian predator, and then she was rescued from an army of tiny, insatiable, yet equally lethal predator larvae.  In fact, while we rarely name wild animals under our care, we’ve got to give this one the moniker “Lucky.”

Bon chance, Lucky!

Turtle Bests Odds to Win Epic Struggle to Save Offspring

Friday, July 24th, 2009

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Injured Diamondback Terrapin Collapsed over Completed Nest

Click here to see published story in CapeCodToday.com.

Crushed shell, blood caked wounds, dehydrated body, and exhausted, a young female turtle collapsed over her finished nest that now held 14 beautiful pinkish eggs and the future of diamondback terrapins in Wellfleet.  Without a large, powerful brain to convince her the situation was hopeless and to rationalize failure, this terrapin fought through pain and impossible odds to protect her offspring.  “Neither angst nor doubt,” the turtle motto, proved key to achieving success when any smart thinking mammal would simply have given up.  I guess that’s the reason turtles survived the dinosaurs and have racked up 250,000,000 years of design success.  Wouldn’t it be wonderful if humans could adopt a few of their environmental survival skills.
 
As I walked toward Turtle Point Saturday morning, a young boy called out excitedly from the Agger cottage.  Tyson had been vacationing with his New York City parents for the last three weeks and had become familiar with Lieutenant Island as the nesting epicenter for diamondback terrapins in New England.  He watched as they crawled ashore from Cape Cod Bay to find nesting spots all over the island from deserted dunes to rustic one-lane dirt roads and driveways.  Eight-year-old Tyson gained a graduate level education in conservation biology in a few weeks of summer of adventure.
 
“Hey, Turtleman!  She’s hurt.  Real bad.  Bleeding.  She needs help.  I saw her on the road.  Run over.”  He spurted out words through clenched emotions.

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Bridge Crushed from Weight of Vehicle

Tyson’s dad explained they had found a terrapin on Marsh Road Extension near some partial nest digs on Friday night.  The turtle had been run over, its shell cracked and bleeding.  Tyson wanted to help the turtle; he begged his dad to put band aids on the wounds.  Dad took Tyson home to settle him down, and when he returned to check out the turtle it had disappeared.  “It probably crawled somewhere to die,” he said. 
 
I promised Tyson I’d search for the injured animal.

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Grass and Weeds Embedded in Cracked Shell

Thirty minutes later I found her draped over a newly completed nest.  Her carapace had large lateral cracks on both sides as a heavy vehicle had completely run over her.  Despite the strong architectural design of the turtle shell, the force had crushed and broken the supporting bridge that holds together the top and bottom shells on both sides of her body.  The breaks in her shell sported weeds and grass stems from where she had dragged herself to hide from predators over night.  Her bleeding had congealed, but she felt light as air from exhausted dehydration.  Thankfully, her strong shell repelled enough of the vehicular weight to prevent fatal organ damage; it had protected the integrity of her spinal column as all limbs continued to function normally.

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Terrapin #2728 After Successfully Completing Her Epic Struggle

I tracked her by following scrapes in the compacted road and driveway.  She had abandoned several tries because the ground was simply too hard to penetrate.  Her last and successful attempt cut through a layer of gravel and heavily compacted parking pad soil until she reached softer sand where she could hollow out an egg chamber for her babies-to-be.  Rear limbs that bear the brunt of digging were worn raw scratching through chipped gravel.  She had covered the nest with every bit of sand she could find and tapped down the soil to protect her clutch.  Now she lay motionless.

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Fourteen Future Hatchlings Weighing 95 Grams (3.4 Ounces)

This turtle had been marked #2728 when we first saw her in July 2006.  We had last observed her on June 25th when a group of kids found her basking on the flooded Lieutenant Island causeway as she prepared to embark on her first nesting run of the year 23 days ago.

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Nest Protected with Predator Excluder

We immediately cleaned her wounds to prevent infection and rehydrated her.  Since her nest lay in such a vulnerable location, a parking pad, we relocated her eggs to a safe, sandy dune where we covered them with a predator excluder.  We wanted to do our part to compensate for what humans had already done to her and to protect these babies she had fought so hard to save.  Thanks to this little bit of extra “scale tipping,” the odds that her eggs would become turtles increased from a meager one in a thousand to better than one in ten.
 
The lost of mature, breeding females to a threatened species, such as diamondback terrapins, is a terrible blow to their recovery.  Because of the cold, late spring, turtle nesting was delayed on Cape Cod by a week to ten days, pushing peak nesting into the 4th of July weekend.  The result was more than a dozen squished turtles that were run over by heavy summer traffic on the Outer Cape.  The impact on a late maturing, long-lived and diminishing population like turtles can be devastating.  It takes a mature female terrapin twenty to forty years of full reproduction to replace just herself.  Losing a dozen mature females in a single season will have a negative impact on the Wellfleet Bay population for decades.
 

Turtle Wins Epic Struggle to Save Offspring

With a bit of turtle TLC, Terrapin #2728 snapped to life and by mid afternoon she headed back into the healing salt marsh channels of Wellfleet Bay.  We have recorded injuries similar to hers throughout our three decade longitudinal study of terrapins on the Outer Cape.  Having survived the initial trauma without loss of limb function, she has a good chance of recovery.  If humans can be even a tad more vigilant in such an environmentally sensitive area as Lieutenant Island, she may survive long enough to bring terrapins back from the brink of extinction.  Her potential babies incubating under the warm sands of Turtle Point will have their say about the future of the species, too … if humans give them a chance.
 

Young Female Terrapin Nests for the First Time

Tuesday, July 7th, 2009

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Ten Perfect Diamondback Terrapin Eggs

While responding to the deadly incident on Lieutenant Island on July 3rd (see Two Tragic Turtle Accidents on Lieutenant Island), the Turtle Journal team rescued a very young female terrapin on her very first nesting run.  She crossed the road at nearly the same spot as the two mature turtles that were run over a few minutes earlier. 

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Young Female Terrapin #9754

Female terrapins on the Outer Cape reach nesting maturity around 8 or 9 years old when they reach a mass of 625 to 650 grams.  Captured for the first time, Terrapin #9754 measured 15.45 cm straight-line carapace length and 14.2 cm plastron length.  She weighed 651 grams.  Based on our 30 year longitudinal study of terrapins on Outer Cape Cod, we know this sized turtle would be nesting for the first time.

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Turtle Point with Five Terrapins and Two Nests

She was removed from busy holiday roads of west Lieutenant Island along with four other more mature female terrapins, all of which were moved to isolated Turtle Point for a better chance to nest safely.  While the other four scooted into the marsh for safety and upland areas in search of an appropriate nesting spot, Terrapin 9754 immediately began to dig a nest directly in front of us.  She thrust her nose into the sand, tossed some dirt over her shell with her front limbs, then moved her rear legs into the shallow pit to begin digging her nest in earnest.

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Young Female Terrapin Digs and Covers Her First Nest

We were able to document the entire nesting process and found very interesting how much of this process is driven by instinct rather than behavior learned over time through practice.  She dug her nest, deposited her eggs and danced the final camouflage steps to cover and disguise the nest location.

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Ten Eggs Weighed 56 Grams Total

Terrapin 9754 dropped from 651 grams to 591 grams after nesting.  To complete the scientific package, we harvested the eggs which measured about 3.1 cm long and weighed about 5.6 grams each for a total of 56 grams for all ten eggs.  The eggs were returned to the nest and covered with a predator excluder to protect them while they incubate in the warm Turtle Point sand.  The Turtle Journal team will be watching Nest #132 very carefully around Labor Day Weekend to get a peek at her first live hatchlings.  Stay tuned to Turtle Journal (www.turtlejournal.com) for the rest of the story.