Author Archives: Wellfleet Bay

Connecting the Dots …. and Reducing Stress for Sanctuary’s Box Turtles

This post was contributed by volunteer Tim O’Brien who’s currently doing a study of eastern box turtles and works to conserve other threatened and endangered turtles.

In 2018 we instituted a non-permanent paint dot marking system for the sanctuary’s eastern box turtles. Here’s why.

There’s anecdotal evidence suggesting that repeated handling of box turtles over time can soften their predator response mechanism. I see this in some of our older resident turtles who have been exposed to decades of day campers and public programs. This could be an issue if a turtle encounters a predator and does not fully and quickly withdraw into its shell.

Unlike most turtles, a box turtle can pull its head and appendages fully into its shell. A hinge in its bottom shell folds up to close off the front, practically sealing the animal in a perfect box. Predators apparently get tired of waiting for a turtle to emerge and abandon it.

Each year we try to process (measure and weigh) every box turtle on the sanctuary at the beginning of the season and again at the end of the season. Often, turtles are captured and processed by interns and volunteers who may not know that the turtle has already been worked up and entered into the data base in a given year. Some turtles are inadvertently processed many times in a year, sometimes even on the same day! It can be stressful to them. To help alleviate this problem, we instituted a paint dot system this year to minimize handling of turtles.

Most of our box turtles are permanently identified using a variation of the Cagle marking system (making tiny notches in the marginal scutes with with a small file). This allows us to uniquely identify the turtle for life.  But what we needed was a short term way to determine whether or not a turtle had been processed in a given year. So now in addition to reading the permanent scute notches, we put a small dot of non-toxic, water-based paint on a vertebral scute that corresponds to the month the turtle was processed. Each of the five vertebral scutes correlates to a month (May – Sept).

Turtles can be active for more months than it has vertebral scutes. So if a turtle is found in April, the paint dot would still go on the first scute for May. Same thing for a turtle found in October; the dot would share the September scute. (Drawing by Tim O’Brien).

The color of the paint denotes the year and we will change the color every year. We use paint colors with earth tones to somewhat blend in with the turtles natural carapace colors. For example, V2 (the second vertebral scute) corresponds to the month of June and yellow was the paint color for 2018. So a small paint dot on V2 indicates that the turtle has had its initial processing of 2018 in June and there is no need to handle this turtle again until the fall. The paint dots seem to last the season, but can easily be scratched off for next year. We used this system all season in 2018 and it seemed to work fine.

Can you tell when this turtle was last handled? Hint: the turtle is facing us. (Photo by Tim O’Brien).

We hope that using this new system will prevent over-handling of our resident box turtles so they can live comfortably and be as safe from predators as possible!

A box turtle demonstrates the predator response for which it got its name. (Photo by Tim O’Brien).

Picturing a Sea Turtle Necropsy

We often say that the sea turtle necropsies we conduct each Saturday in winter at the Woods Hole Oceanographic Institution are not for everyone. It’s a long day, there’s a lot of standing, the lab is chilly, and there are dozens of dead turtles being cut open.

But those conditions have not discouraged sea turtle volunteer Karen Strauss, a gifted photographer. She’s been documenting these sessions for seven years. In that time, Karen and her camera have captured some compelling and informative images.

One of the headlines from of this year’s sessions are the visible plastics discovered in some turtles.

Remains of what appears to have been a plastic shopping bag. (Photo by Karen Strauss).

There’s been growing public concern about the massive amount of plastics that end up in the world’s oceans. Karen’s pictures provide a sample of that problem and, as she says, make the abstract real. “When you show photos of balloons in a turtle’s stomach, the problem goes from something people have heard about to something more tangible.”

Remains of plastic balloon fill a turtle’s stomach (Photo by Karen Strauss).

This year, Karen and camera were on hand to document the lobster bands found in a Kemp’s ridley’s intestines. These bands are placed on the lobsters’ claws when they go to market so they don’t use them on each other or anyone handling them.

Lobster claw bands are a common plastic found on Cape Cod beaches. (Photo by Karen Strauss).

Karen’s work also reveals the elegance of sea turtle physiology, such as the small organs that work with the larger ones, which allow the animal to perform a basic life function, such as eating. “One of my favorite structures in a sea turtle are the papillae that line the esophagus,” she says. A picture of a piece of sea lettuce trapped in the papillae of a green sea turtle’s esophagus stayed with her. ” You think about this as maybe the last thing this herbivore ate.”

The ivory-colored papillae line the turtle’s esophagus and serve to keep food moving toward the digestive tract even when the turtle expels water through its mouth. (Photo by Karen Strauss).

Karen says she understands why some people may not find a sea turtle necropsy appealing. But instead of seeing dead turtles, Karen says she sees a special opportunity.

Wellfleet Bay is very fortunate to have use of a state of the art necropsy suite on the Quisset campus of the Woods Hole Oceanographic Institute. (Photo by Carol “Krill” Carson).

“Every year, we have the largest collection of juvenile Kemp’s ridleys—basically healthy animals that have died only because of cold-stunning.” The necropsy sessions are attended by academic and government scientists engaged in research which ultimately could result in better conservation for an endangered species. The sessions, she notes, are also valuable for students. “We’re training the next generation of scientists by giving them a rare experience.”

Bridgewater University masters student Michael Rizzo examines a tissue sample. (Photo by Krill Carson).

No matter how many pictures she’s taken during Wellfleet Bay necropsy sessions, Karen says it’s the chance to learn that keeps her coming back each winter. “Just when I’m about ready to say we’ve seen it all, we find something new.”

Karen and her camera focused, yes, on an intestine. (photo by Krill Carson).

Close-up or macro photography is very challenging. To get a good picture of a turtle’s digestive tract that had a balloon string running through it, Karen had to merge 18 or more pictures together into a massive single image that showed both the full length of the intestines as well as all the detail. “Looking so closely at a turtle’s anatomy has given me the chance to learn so much more”, Karen says. ” I love to find out how things work.”

This post was contributed by Wellfleet Bay sea turtle volunteer Karen Strauss. We’re grateful that Karen works hard to document our necropsies so well and that she’s so generous in sharing her terrific work.  Our thanks, too, to Carol “Krill” Carson of the New England Coastal Wildlife Alliance for sharing her picture of Karen and many dozens of others over the years.

Sea Turtle Conference Allows Researchers to Learn and Compare Notes

This post was contributed by Wellfleet Bay sea turtle research associate Karen Dourdeville.

Recently, I was fortunate to be able to attend the International Sea Turtle Society Symposium, in Charleston, SC, one of the largest sea turtle meetings in the world.

The annual symposium is truly an international event, and it’s exciting and invigorating to meet “sea turtle people” from many different countries and to hear about some of the good science occurring with sea turtles all over the world.  The symposium also drives home the urgent conservation needs that many sea turtle populations are facing.  Attendees are very interested in research here in the northwest Atlantic sea turtle feeding grounds—which include the waters of the Cape and Islands.

Karen Dourdeville (right) at the Sea Turtle Society Symposium with New England Aquarium sea turtle rescue partners, Connie Merigo (left) and Linda Lory
(far left).

One big plus from the symposium is looking for new ways that WBWS sea turtle work can be put to research/conservation use, such as possibly contributing samples from our dead cold-stuns toward a study of a blood test for sexing sea turtles. At the moment, determining the sex of an immature sea turtle generally can’t be done unless the turtle is necropsied.

I attended two workshops. One focused on learning more about male sea turtles, which are difficult to study because they don’t come ashore to nest. Research on males would help give a better picture of overall sex ratios and male reproductive behavior, both of which are crucial to achieving a sustainable sea turtle population.

The other workshop discussed proposed changes to the US Endangered Species Act, which has protected many species, including sea turtles, since the act was passed in 1973. These changes could take effect as early as this summer. One of the biggest changes under consideration would weaken the definition of a “take”, that is, the number of turtles injured or killed, for instance, as by-catch in commercial fishing or human activity on nesting beaches.

Despite some of the sobering news on the conservation front, it was gratifying to talk to staff from different sea turtle rehab facilities who care for some of the Cape Cod cold-stuns. Five of our cold-stunned loggerheads are in rehab at the South Carolina Aquarium, and hopefully they will all be released in the coming months.

Sea Turtle Conservation in Your Backyard: Cape’s Cold-stun Season Inspires Local Students

While hundreds of cold-stunned sea turtles were being rescued from local bayside beaches this  fall, Outer Cape school children–most of whom live within 15 minutes or less from a bay beach—are getting front row seats for what’s become a unique natural phenomenon that occurs practically in their own backyards.

Chatham third graders on a sea turtle patrol at Crosby Landing in Brewster. (Photo by Sheila Hoogeboom)

In a special curriculum developed by Wellfleet Bay educators, students from Truro to Chatham have been learning about sea turtles, how to respond when turtles strand on local beaches in the fall, as well as what causes turtles to come ashore.

Truro second graders engage in a sea turtle life cycle game in their classroom.

The program, which for some schools can run for a full year, covers fundamentals about reptiles, sea turtle species, adaptations, and life history. It also includes field experiences at the wildlife sanctuary and on the beach.

On the day they were patrolling for cold-stunned turtles, Chatham students got lucky: they happened to be at Crosby Beach on Brewster’s bayside when they got word someone had found a turtle.

Wellfleet Bay turtle staff member Ben Thyng pulls a Kemp’s ridley from seaweed which the rescuer had placed over the turtle for protection. The driftwood stick in foreground was used to show Ben where to find the turtle.

During a visit to the sanctuary, Wellfleet fifth grade students had a chance to see the sanctuary’s sea turtle “ICU” where staff members measure and weigh turtles before their ride to the New England Aquarium for rehabilitation. Like the staff, the kids kept their voices low, which is standard protocol for helping to reduce turtle stress.

Having the chance to see a sea turtle at such close range initiates discussions about broader topics: sea turtle biology, the threats turtles face from vessel strikes, entanglements, and marine plastics, and the role of climate change in the cold-stun phenomenon. Despite the many challenges facing turtles, Cape kids learn they have a special opportunity to help protect them.

Practicing sea turtle rescue with a plastic turtle.

Our thanks to these organizations for making Wellfleet Bay’s sea turtle curriculum possible in our local schools:

Wellfleet SPAT- (Shellfish Promotion and Tasting)

The Chatham Fund of the Cape Cod Foundation

Mass Cultural Council – STARS Residency
(Students and Teachers working with ArtistsScientists, and Scholars)

Sizing up a Sea Turtle Season

Wellfleet Bay has been rescuing sea turtles for more than 30 years and almost every season has its memorable moments.

Sea turtle staffer Elora Grahame is happy to be processing one of the few live turtles that stranded following a killer Thanksgiving weekend.

Unfortunately, the 2018 cold-stun season will likely be remembered in large part for the Thanksgiving Day week-end deep freeze that killed scores of turtles, most of which would have been successfully rescued under normal conditions.

Over Thanksgiving weekend most bayside beaches between Eastham and Dennis were frozen above the high tide line. At one point we had to tell our dedicated volunteers to stand down because of the dangerous walking conditions.

A very few lucky turtles managed to make it through that ice box weekend, including this Kemp’s ridley who turned out to be a repeat customer. After stranding here last year and being successfully released in August, this young turtle managed to find its way back into Cape Cod Bay where it got trapped again!

Kemp’s ridley number 985113002181787 must love Cape Cod Bay, the New England Aquarium or both! This time it may have earned a free trip to Florida.

2018 was also our second busiest cold-stun season ever—with 800 turtles recovered, a little more than half of them alive.

Martha Nolan, who took part in a Cape Cod Field School on marine animal rescues, carefully holds a cold-stunned Kemp’s ridley. Photo by Carol “Krill” Carson.

We’ll also remember the year for giving us  the biggest loggerhead we ever rescued—a nearly 300 pound female pulled from Great Island in Wellfleet. Lucky for her (and us) she stranded the day before the Thanksgiving cold front arrived.


Thanks to that National Park Service truck and ranger Chris Anderson, this big girl was successfully moved off Great Island in Wellfleet and transported to the New England Aquarium where she continues to recover. Photo by Elora Grahame.

Our work doesn’t stop when sea turtles no longer come ashore.

Soon, our Saturdays will be spent at the Woods Hole Oceanographic Institution for necropsies of the turtles that didn’t survive their ordeals. These sessions increasingly are attended by government, academic, and other scientists working to fill in the many gaps in what is known about sea turtle biology and life history. Each year, our necropsies collect more and more samples for research aimed at shedding light on where young sea turtles are traveling, foraging, what they’re eating, and at what stage of their lives.

Roksana Majewska of North-West University in South Africa has been looking at species of diatoms, single cell algae with silica walls, that attach to sea turtles. Wellfleet Bay has been providing her samples from cold-stunned sea turtles on Cape Cod. The kinds of diatoms that live on sea turtle shell and skin may eventually provide information about turtles’ movements. Here, Roksana takes samples from a nesting olive ridley in Central America.

Losing a lot of turtles to an early season cold snap was the toughest part of the fall. But it certainly helps to know that at least several hundred of these critically endangered sea turtles survived and that the rescue program is supporting conservation research as well as unique field opportunities for students.


Monomoy Regional High School students deploy a surface drifter off Sesuit Harbor in Dennis. The drifter project, designed to improve our understanding of currents in Cape Cod Bay, is now in its sixth year. This fall more than a half dozen drifters were released, many of them washing up on the same beaches turtles did. Photo by Ben Thyng.

Saving a Sea Turtle for the First Time: A Student Shares her Story

When my biology professor announced that the class had a weekend trip dedicated to rescuing cold-stunned sea turtles in Wellfleet, we were thrilled! We discussed six papers, and read more than twenty about the physical and biological factors of cold-stunning to prepare for the trip. But reading these papers could never have prepared me for the breathtaking feeling of rescuing sea turtles in real life.

The first thing that Unity College tells its new students during convocation is that we are going to make a difference. Attending a school that focuses on being environmentally conscious and encourages experiential learning inspires a future focused on protecting the blue planet. But sea turtles are charismatic megafauna.They are the celebrities of National Geographic and often serve as a poster child for plastics pollution mitigation. When you live in New England, you never think you are going to see those tropical species in person. Mass Audubon gave us that opportunity.

After a five-hour drive from Maine on a Friday afternoon, and being up even later for preparatory lectures on cold-stunned turtle procedures, you would think a 5:00 a.m. wake-up call would produce groggy young adults. But the last thing you could see in our eyes was regret. Everyone was cheerfully stuffing hand warmers into their gloves and socks to get ready for the surveys ahead.

Unity students walk the high tide line and watch the water’s edge for stranded sea turtles.

After two hours of marching through the sand, we were disappointed we didn’t find anything. I felt sorry for turtles that couldn’t make it to shore, and were instead freezing in the bay. As we were gearing up to head back to the Wellfleet Bay Wildlife Sanctuary, our guide, Bob Prescott, received a call about a sea turtle found in Brewster.

It’s always good to have a group on the beach to rescue a loggerhead.

He asked us if we had room in one of our vans for a 90 pound loggerhead. We guaranteed that we had plenty of room!

Putting advance preparation into action!

Like wildlife paramedics we loaded the lethargic turtle into our trunk and carefully remembered our brief training. Loading the turtle. Fifty-five degrees. Carapace upright. Flippers comfortable. Be quiet. Is this happening? I was scared to drive because I kept thinking that if we hit a pothole, the turtle would die, and I’d go to jail for killing a member of an endangered species!

The loggerhead is unloaded before being weighed, measured and assigned a number by Wellfleet
Bay staff. Photo by Cheryl Frederick.

But we made it to Wellfleet Bay and with the staff’s help, were able to process it and measure its straight and curved carapace lengths, widths, and weight.

Large calipers are used to get straight line measurements for a turtle. 

Then, the loggerhead was ready to take its next step towards rehabilitation in Quincy at the New England Aquarium.

Smaller calipers for smaller turtles.

We were able to process a few Kemp’s ridley sea turtles that had been brought to the sanctuary, observe a professional Kemp’s ridley necropsy, and do another beach survey.

But nothing compared to that first feeling of rescuing a sea turtle for the first time. Upon reflection, I am forever grateful to Wellfleet Audubon and Unity College for providing this rare opportunity to interact with marine life. It made me feel like an educated biologist-in-training and am so glad I’m able to spread the mission of protecting biodiversity. Thank you, Wellfleet Bay!

This blog post was contributed by Jordan Baker, a marine biology major at Unity College in Unity, Maine.

Sea Turtle Season Offers Several Surprises and One Deep Freeze

The idea that this fall’s cold-stun sea turtle period could be a memorable one occurred to us when turtles began stranding about 2 weeks earlier than usual, in mid-October.

Sea turtle staffer Ben Thyng nets a Kemp’s ridley during a school boating trip off Dennis.

Only days before rescuing our first cold, immobile turtles, we’d found several live, swimming turtles out at sea—a pretty unusual occurrence. Our marine life cruise off Dennis netted one lively Kemp’s ridley. A second ridley was discovered not long after that during another school research trip off Dennis. Both turtles represented a special opportunity to study active sea turtles in the period before they likely would have become cold-stunned.

Then two more surprises happened.

Wellfleet Bay volunteer Sandy McKeen with stranded live leatherback at Ellis Landing in Brewster. (Photo by Jay Hubbell).

Two young leatherback sea turtles, which are not typically susceptible to cold-stunning in part due to their very large size, stranded in Brewster and Eastham within two weeks of each other. While most leatherbacks that come ashore are dead, both of these turtles were alive.

New England Aquarium staff surround the Eastham leatherback to assess vital signs, such as heart rate and respiration and to administer emergency care.

Each animal required special assistance and many hands to get moved from the beach and into a vehicle for trips to the New England Aquarium’s Animal Care Center. Unfortunately, neither leatherback survived.

A week before Thanksgiving, traditionally a busy period for strandings, the forecast called for conditions that we knew would be deadly for sea turtles trapped in Cape Cod Bay. Overnight temperatures in the teens combined with northwest winds of at least 30 miles an hour practically guaranteed scores of turtles would come ashore and that most would not be alive.

The cold arrived the night before Thanksgiving. On the day before, 87 turtles stranded.  Most were alive. By Thanksgiving afternoon, 82 turtles had come ashore and all but about 5 were dead. The dead ones were like blocks of ice, many of them appearing to have frozen as they made a final attempt at swimming. It was depressing.

This deceased Kemp’s ridley, like many that came in, looked like it had been frozen in place.

The “flash-freeze” event made national and even international news over the holiday weekend. While the turtle die-off was certainly part of the cold weather story, in some cases it was reported as an isolated event and not in the context of the hundreds of sea turtles that already had been stranding due to the bay’s normally cooling waters.

It’s that larger context that offers a slightly brighter picture. As air temperatures began to moderate after the holiday, the number of live turtles we recovered from beaches started to increase again. And they’re bigger turtles. The loggerheads are starting to come ashore, including this massive mature loggerhead sea turtle, possibly the largest ever to strand in Massachusetts:

Of course this hefty turtle had to come ashore on Wellfleet’s 6 mile-long Great Island! Thank goodness for Chris Anderson of the Cape Cod National Seashore and his truck! And our friends at the New England Coastal Wildlife Alliance who helped us lift!

This fall has had so many twists and turns that we hesitate to offer any more predictions. But it does appear we’re headed for another big year. Not as big as the 1200 turtles recovered in the fall of 2014, but likely our second biggest cold-stun period ever. In the meantime, we’re continuing to do our best to help as many live turtles get the life-saving care they need to return to the sea.

Helping a Little Turtle Face Its First Winter

After a dog disrupted the overwintering process of an eastern box turtle hatchling last week, we were faced with the dilemma of how to put him/her back and allow natural overwintering or brumation to take place.

This baby needs to brumate! An eastern box turtle that hatched in the summer of 2018 is facing its first winter. (Photo by Tim O’Brien).

I tried to research methods others have used to introduce hatchlings into late season brumation, but couldn’t find out very much. So, I crafted my own process based on careful thought and intuition based on my many years as an amateur herpetologist. My plan was to house the hatchling within a paper tube that would deteriorate within the ground, yet afford the little turtle some breathing space until he acclimated.

We cooled the turtle to 50 degrees overnight. The next day I dug a hole next to a brumating adult so I could be reasonably confident this was a good spot.  Since they can’t dig very well, hatchlings likely brumate under leaf litter. But I wasn’t comfortable just placing the little guy under leaves that late in the season. Since most adults brumate at a depth of 10 centimeters or less (about 4 inches), I placed the hatchling at that depth. I decided to use a paper tube plugged each end with soft detritus and some breathing space in the middle.

Box turtles spend the winter about 4 inches below a soft layer of decomposing leaves and soil. (Photo by Tim O’Brien).

I put the turtle in the tube and placed the tube at a 45 degree angle within the hole. This angle would allow him to dig deeper if need be or crawl out if he wanted to. I also placed an Onset temperature logger in the hole at 10cm to record temperatures all winter. As I’ve reported in the past year, I’m currently involved in a study of box turtle brumation which includes recording soil and air temperatures at turtle overwintering spots around the sanctuary.

The paper tube will serve as a sort of house to ensure the hatchling has some initial protection and the ability to move if necessary. (Photo by Tim O’Brien).

I’ll monitor the young turtle throughout the winter since I don’t want the tube to collapse and prevent his emergence in the spring, assuming that he makes it. But I sure hope he does. I’ll keep you posted!

 

This post was contributed by Wellfleet Bay volunteer and box turtle researcher Tim O’Brien.

Bird Study Gives Students a Science Boost

Becoming familiar with the tools of the trade

Fourth graders from the Harwich and Chatham Elementary Schools have been studying birds this fall. But not just for an hour or so or even a day. They’ve been taking part in a year-long curriculum developed by Wellfleet Bay educators which combines a series of in-class lessons with actual field experience and even a chance to watch bird researchers at work.

During an October visit to the sanctuary, the students rotated through several activities, including one about how to identify birds.

Students learn to observe field marks and to use a basic field guide to identify birds. It’s not easy–one person describing a robin can result in someone else selecting an oriole!

In this activity, one student holds a photo of a bird, another tries to describe its field marks, and a third student, with her back to the student describing the bird, uses a kid-friendly field guide to try to determine the species. It can be tricky!

Wellfleet Bay educator Morgan Peck discusses plants that birds use.

The birding curriculum was developed to support state education frameworks for life science, which requires students to understand concepts such as adaptation and ecosystem functions. Having the chance to observe differences in birds’ beaks or to see a bird in the process of making its first (and possibly its last) fall migration makes these abstract ideas more tangible.

Outdoors, students took a walk to identify plants used by birds, such as oaks, pines, and the black cherry tree with its bird-friendly bark:

 

Finally, there was a chance to see bird researchers in action! The sanctuary’s bird banding station catches birds, measures and weighs them, and checks their physical conditions. A small metal band with a unique number is placed on their ankles so that they can be  monitored and studied.

Bird bander and researcher James Junda.

Students learned about the delicate mist nets used to capture songbirds and how the location of the nets (there are 22 in all) helps us to understand how birds are using the sanctuary’s various habitats.

On this particular morning, northern winds had brought in a wave of kinglets, including this Ruby-crowned Kinglet, a bird pretty easy to identify when it displays the red feathers on its head!

Kinglets usually only show their colorful crown feathers when they’re excited or angry. This bird’s probably a bit of both!

A familiar feeder bird was captured in the mist nets, giving bander James Junda a chance to discuss why songbirds have different leg lengths.

 

Before ending their day at the sanctuary, the students were invited to touch a banded
White-throated Sparrow before it was released. Banding assistant Valerie Bourdeau showed them how to do it carefully.

 

 

Wellfleet Bay school programs coordinator Spring Beckhorn says by focusing on birds, students gain initial insight into how animals function and interact with their habitats.

“Seeing a bird in the hand makes concepts like migration and adaptations for flight come to life for the students, ” she says.  “We hope that this experience will be memorable and maybe even pique their curiosity to continue to learn more about wildlife and its relationship with the rest of the natural world.”


Thank You!

 Wellfleet Bay would like to thank the individuals, foundations, local businesses, and community organizations whose generous support made our 2018 conservation and education programs possible. Gifts and grants allow us to continue to research and protect the unique ecology and wildlife of Cape Cod and educate children about their local environment with hands-on science programs.  Each year, Wellfleet Bay provides classroom lessons and field investigations to nearly 2,100 students on the Outer Cape.

Anonymous (2)

Brewster Conservation Trust

Cape Cod Five Charitable Foundation Trust

Cape Cod Young Professionals

The Chatham Fund of the Cape Cod Foundation

Eversource Energy Foundation

Max and Victoria Dreyfus Foundation

Harwich Conservation Trust

Mary-Louise Eddy and Ruth N. Eddy Foundation

Massachusetts Cultural Council

Massachusetts Environmental Trust

Robert B. Our Co., Inc.

Robert Verity Clem Memorial Scholarship Endowment Fund

Tern Foundation

Tiger Baron Foundation

W. Vernon Whiteley, Inc.

Wellfleet Shellfish Promotion and Tasting―SPAT

Women’s Club of Chatham, Inc.

Wellfleet Bay Leadership Friends and all supporters of the Sanctuary

What’s with All the October Sea Turtles? Flurry of Healthy Turtles Precedes Arrival of Cold Ones

October 22 was the official start to the cold-stun sea turtle season on the Cape, a relatively early start. Four Kemp’s ridleys, the most endangered of all sea turtles, were rescued that day in Eastham and Brewster.

Bob Prescott holds a very small Kemp’s ridley netted from a marine life cruise out of Sesuit Harbor in Dennis.

Given that the bay temperature was still relatively warm, finding our first cold turtles was a bit of a surprise. Still, we had had inklings that the turtles were on their way.

Spotting or finding sea turtles, despite the Cape’s cold-stunning phenomenon, is pretty rare. When sea turtles venture north in the summer, they are usually well offshore. The only time they’re spotted is usually by boat or when they’re killed or injured and wash in.

So two weeks earlier, when two basically healthy Kemp’s ridleys on the same day were recovered on the Brewster flats, we took notice. Then, a week later two ridleys were spotted swimming in the bay during our marine life cruise on the Albatross.  A crewmember managed to net one turtle, despite very choppy sea conditions.

The lively turtle was brought back to our wet lab for weighing and measuring before joining the two Brewster turtles for assessment at the New England Aquarium. This turtle and the others give the aquarium a rare chance to examine sea turtles before they slip into cold-stunning.

The aquarium reported that the internal body temperatures for the turtles were in the range of 72-65 degrees, definitely not cold-stunned, which is usually 50 or below. Then a week later, our first cold turtle washed in with an internal temperature of 47. Cape Cod Bay was still about 57 degrees.

So what’s going on out there? Sanctuary director Bob Prescott, who has decades of cold-stunned sea turtle experience, has offered one educated guess: Recent turtle recoveries have all occurred in areas with extensive tidal flats. Perhaps the warmer turtles spent less time exposed to colder air temperatures (by not being exposed to multiple low tides) but the cold-stunned animals were less fortunate.

When you factor in the many ridley and loggerhead sightings this past summer (which Wellfleet Bay tracks), it does have us thinking the sanctuary will be a busy place this fall.