Blog Post By: Christine Segnari, Sea Turtle Intern
One of the most unique parts of Edisto Beach State Park is the interactions between Loggerhead Sea Turtles and the public. Beachgoers, who come from the campground, resorts, or locals to the island, will begin to see these majestic ocean creatures around the beginning of May, and those who do not see the turtles will see the nests they lay in the cover of night. In the early hours of the morning, people can see turtle tracks leading to a pit of thrown sand, which is where the nest is located. During our Dawn Patrols, many members of the public have come up to us and recounted their experience seeing a turtle laying her eggs and how incredible it was to witness. The first nest was found on May 7, 2022, and as of May 29, 2022, there have now been 63 recorded nests on Edisto State Park Beach. When female Loggerhead turtles come ashore to nest, they lay an average 120 eggs per nest and 3-5 nests per season. Therefore, it is incredibly important that when the public do see sea turtles nesting, they are cautious and stay 20 ft. away from the turtle. Using red light instead of white light ensures that the turtle will not be disturbed. On Wednesday night (May 25th), I was out with one of the Sea Turtle Patrol volunteers. We had just finished with our Night Patrol and had decided to head home. However, a man came to our office and excitedly told us that there was a sea turtle coming ashore to lay her eggs. I could not believe my ears; I had been an intern for a week and a half by this point, and I had not yet seen a turtle nesting. This was one of the things I was most looking forward to. We kept at least a 20 ft. distance while watching the turtle climb the challenging scarp (where the beach is eroded). We had our lights completely off for most of the time, but occasionally, we would turn on our red lights to see the turtle continue the process of nesting. This experience was amazing, and the couple we shared this moment with made it even better. They were familiar with the nesting protocol; therefore, the turtle wasn’t disturbed before I and the other volunteer arrived at that location. Knowing the correct way to interact with a nesting turtle would allow for a successful nest with minimum disturbance, which is essential due to the amount of turtles that come onto Edisto Beach State Park to nest.
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Blog Post By: Sarah Glover, Sea Turtle Intern
My name is Sarah Glover, and I am one of the 2022 Sea Turtle Interns here at Edisto Beach State Park! I am a rising senior at the College of Charleston, where I am majoring in marine biology and minoring in environmental and sustainability studies. It has been an exciting first couple weeks full of turtle activity! On one of my first days, we spent six hours on the beach during dawn patrol. We found two false crawls and five nests, two of which we relocated. Relocation is necessary in certain circumstances and does not harm the success rate of the eggs if done carefully. One of the relocated nests was just below the high tide line, which means it was at risk of experiencing too many wash overs from the tide. The other one was right on the edge of a scarp, leaving it vulnerable to erosion. We also found a diamondback terrapin, a turtle species that lives in the creeks and nests on the beach. After watching her for a while and trying to release her into the wild, we decided she needed some extra care (she was exhausted, overheated, and malnourished) and took her to the Environmental Learning Center. She is currently at the South Carolina Aquarium being rehabilitated. My favorite experience so far was when we saw a loggerhead sea turtle on our night patrol a few nights ago! We were able to watch as she emerged from the water, made her way all the way to the dunes, dug her egg chamber, and finally laid her eggs. This was my first time seeing a sea turtle in the wild and it was such an incredible thing to witness! I am very excited for my summer as an intern here at EBSP learning about and helping protect loggerhead sea turtles! Blog Post By: Dalton Moore, Sea Turtle Intern
Hello, my name is Dalton Moore! I am a sea turtle intern for the summer here at Edisto Beach State Park. I am a Marine Biology major at the University of South Carolina to further my career through conservational biology or research. Edisto has always been like a second home to me, so I was very ecstatic to receive the opportunity to do something so unique in such a familiar place! When you typically hear “’ Tis the Season,” it is usually a holiday reference. But I am here to provide another way of celebration. THE SEA TURTLES ARE BACK! Here on Edisto Island, we predominantly see Loggerhead Sea Turtles allocate nests along the shorelines near estuaries. The Loggerhead turtles are known to use the earth’s magnetic fields for nesting within 40-50 miles of where they were initially hatchlings. The season for nesting began in early May and will continue until September. Numerous female sea turtles will push themselves onto the beach. Typically, beginning to create a hole between the high tide line and the dune front that is approximately 18-24 inches deep. However, this is not always the case. Some may lay their nest below the tidal line and become washed over. Either way, the female turtle will then presume to deposit an average of 100 eggs. After her egg chamber is laid, she will then cover the eggs with sand using her flippers in an attempt to erase the signs of her nest. She will then return to the ocean but return 3-5 more times that season to a similar location to lay more nests. As a member of the Turtle Patrol, I work with my fellow interns and our coordinator Leah to help identify and document the nest. Within our first two weeks, we have already established 23 nests and 13 false crawls. 20 of the 23 were successfully laid and registered as in situ nests, which means the nest was not removed. However, 3 of the 23 were relocated in an attempt to avoid erosion of the nest from tidal waves. It was essential to move the eggs carefully one by one to prevent disturbance and rotation of the egg, which could disturb the developmental stage of the sea turtle. Overall, the beginning of the season has been tremendous and suggests that we may have a busier season compared to the previous season, where the first nest in Edisto Beach was not documented until May 15th, 2021. I am beyond excited to work with my fellow staff to provide exponential success with nesting turtles and, eventually, hatchlings! Dalton MooreMy name is Dalton Moore. I am a rising senior at the University of South Carolina. I am majoring in Marine Science in attempt to further my career through conservational biology and/or research. My hobbies include anything related to the outdoors whether it be going to the beach, golfing, hiking, etc. I have always lived near Edisto Island and with every chance I had, came to visit the beautiful coastal area. I look forward to working with the other interns to provide help and knowledge to this wonderful internship opportunity. Christine SegnariHi, my name is Christine Segnari (she/her)! I am studying Wildlife Conservation and Water Systems & Sustainability at Virginia Tech. In the future, I want to work with marine life in tagging, research, and rehabilitation. In my spare time, I enjoy reading or watching Netflix. Sarah GloverHi, my name is Sarah! I’m from Lawrenceville, GA. I’m a rising senior at the College of Charleston, where I am majoring in Marine Biology and minoring in Environmental and Sustainability Studies! I also volunteer at the South Carolina Aquarium as a Conservation Assistant. In my free time, I enjoy reading, learning calligraphy, and practicing photography. I fell in love with sea turtles during a school field trip to Jekyll Island in seventh grade, and I am so excited to be working with and learning more about them this summer! The turtles have been keeping us busy! We are already at nest 10 on Edisto Beach State Park. Last season we did not find our first nest until May 15th, so we are well ahead of schedule with our nest count. Did the season just start earlier this year or will it be another big season? Stay tuned to find out!
Our interns have begun turtle training and will be introduced on the blog soon! They will be writing blog posts to share as well, either on a topic that fascinates them or their personal experiences. We are so thankful for their help and are excited for them to get to experience our Edisto turtles! We are very excited to share that the first nest at Edisto Beach State Park has been found on May 7th! Along with the first nest, two false crawls were documented. A false crawl can be natural, where the sea turtle did not find the right spot to nest, but it can also be due to human disturbance. Be sure to keep a distance of 20ft if you happen upon a sea turtle and keep all lights out (unless the color red). Thank you for helping us to keep a safe place for the sea turtles to nest! What are your guesses for the total season count?! Will it be another record year? Time will tell. So stay tuned to the blog to find out! Our popular sea turtle night walk program will run every Tuesday, Thursday and Saturday in June and July, beginning June 7th. Our reservation system has moved online this year. To learn more about the night walk program and to register, please visit: https://southcarolinaparks.com/products/10002569
When out for a walk on Edisto Beach State Park, you may come across one of these posts. These posts are to mark our buried temperature loggers. This season we have buried six temperature loggers along our 1.5 mile stretch of beach. If you scroll a few posts down, you will come across more information on why temperature is important and how it can influence the sea turtle hatchlings.
We are excited to begin collecting sand temperature data this season and are looking forward to learning more! We are hosting a beach clean-up on Earth Day, Friday April 22nd. We will meet up at the white office building in the day-use area of our park. It will be a great way to celebrate Earth Day and help to create a squeaky clean beach before the arrival of our sea turtles.
We will begin around 9am and you can pick up as much or as little as you would like! Looking forward to seeing you then! We are happy to share that the shorebird fencing was installed today. It runs for roughly half a mile down the beach to Jeremy's Inlet. Last season we had several Wilson's Plovers and Least Terns nest successfully. These species are also considered threatened, as their population is lower then it should be. Just a reminder that if you are visiting the beach, to stay out of this roped off area and to keep your dogs on a leash, as even a friendly and good behaving dog can frighten the shorebirds. These birds are highly susceptible to disturbance and will choose to leave and nest elsewhere if they deem the area unsuitable. Thank you for caring for the other species that nest on the beach! Do you know the difference between shorebirds and seabirds? Diet - They have different diets. Shorebirds prefer to feed on invertebrates found in the soil, whereas seabirds feed on fish Nesting - Shorebirds are solitary nesters, whereas seabirds prefer to nest in colonies Defense - Shorebirds use camouflage and distraction to protect the nest, whereas seabirds defend nests by dive bombing, calling loudly, etc. The Wilson's Plover is a shorebird and the Least Tern is a seabird. This past Tuesday, we received a call to the Environmental Learning Center about a possible sea turtle in distress. The lady that called it in spotted it on the town beach side and noticed the turtle could be seen at the surface for over an hour but it was 60 yards offshore.
I grabbed my binoculars to see if I could get a better look. Well it was not just one sea turtle but two! It was mating loggerhead sea turtles. They continued drifting down the beach until they were in front of the state park campground. Another hour passed until they finally departed under the sea. This is a rare sight from the beach and we were lucky to have our Assistant Interpreter, Brandi, out and ready with her telephoto lens to capture it! With this sight, we sure are hoping for a busy nesting season. It is less than a month away now until our daily patrols begin! This past week was a week of informative and inspiring turtles talks! I had the opportunity to attend the Wider Caribbean Sea Turtle Conservation Network (WIDECAST) conference and then attended the International Sea Turtle Symposium (ISTS). It was a week filled with new sea turtle research and initiatives being done around the world. The ISTS was held virtually from Australia. Next year it is hopefully to be held in-person again in Cartagena, Colombia. It was nice to still be able to connect virtually but a trip to Cartagena next year sounds appealing! I think travelling is on everyone's mind now that things are starting to feel normal again. I am feeling very inspired and motivated as we get closer and closer to the beginning of our nesting season! Hello fellow turtle enthusiasts and blog readers!
I am excited to share that I am back for the 2022 nesting season at Edisto Beach State Park. This will be my 7th year leading the program as the Sea Turtle Specialist and my 10th year since my first sea turtle internship (which was here at the park!). I am looking forward to getting things organized for the upcoming nesting season. Will it be another record year? Here's hoping! Over the next month, I will be sorting supplies, working on new projects, prepping for our upcoming nest adoptions, attending sea turtle conferences, installing shorebird fencing and so much more! It will be a busy month and then May will be here before we know it. We are looking forward to interviewing and hiring our summer interns. Stay tuned to the blog to follow along for our 2022 sea turtle nesting season! If you are reading this, it means you have seen one of the labelled posts on Edisto Beach State Park! Thanks for scanning the QR code to learn more about it! This post is used as a marker for one of the buried temperature data loggers. Prior to the start of the 2022 Loggerhead (Caretta caretta) sea turtle nesting season, we installed sand temperature loggers in randomized locations along our 1.5-mile stretch of beach. We chose locations just above the Spring high tide line and locations closer to the dunes, where sea turtle nesting is most likely to occur. These temperature loggers will provide helpful insight into the temperatures that the incubating loggerhead sea turtle eggs will experience this season. Why is sand temperature important? Sea turtles, like most reptiles, have temperature-dependent sex determination (TSD). It has been determined that the warmer the sand during incubation, the more likely female hatchlings will be produced and the cooler the sand during incubation, the more likely male hatchlings will be produced. This pivotal temperature is approximately 29 degrees Celsius (84.2 degrees Fahrenheit) (Mrosovsky 1988). The most influential temperature on the sex determination process occurs during the middle third of incubation (Ackerman 1997). Loggerhead sea turtle incubation times can range from 45-70 days. The temperature the eggs experience during incubation will also influence developmental times, hatchling fitness and hatching and emergence success (Fisher et al. 2014). There are many other factors aside from sand temperature that can influence sea turtle hatchlings. Accumulated precipitation and humidity are considered to be the other climatic forces on the hatchling success (Montero et al. 2018). Although the temperature readings alone will not give a complete representation, beginning the collection of this data may assist future and greater-scale research projects in the state of South Carolina. References:
Ackerman, R. A., (1997). The nest environment and the embryonic development of sea turtles. In: The Biology of Sea Turtles (eds Lutz PL, Musick JA), pp. 83–106. CRC Press, Boca Raton. Fisher, L. R., Godfrey, M. H., & Owens, D. W., (2014). Incubation Temperature Effects on Hatchling Performance in the Loggerhead Sea Turtle (Caretta Caretta). PLoS One,9 (12), e114880. https://doi.org/10.1371/journal.pone.0114880 Montero, N., Ceriani, S. A., Graham, K., & Fuentes, M. M. P. B., (2018). Influences of the Local Climate on Loggerhead Hatchling Production in North Florida: Implications From Climate Change. Front. Mar. Sci. 5:262. https://doi.org/10.3389/fmars.2018.00262 Mrosovsky, N. (1988). Pivotal temperatures for loggerhead turtles (Caretta caretta) from northern and southern nesting beaches. Canadian Journal of Zoology, 66: 661-669. https://doi.org/10.1139/z88-098 Welcome to our new and improved YouTube channel! Miss Murtle and I are working on creating more fun educational content to share. We plan to upload a new video for every Turtle Tuesday! This videos will be fun educational talks, showcase our travels and the various permitted work out on the beach.
Be sure to subscribe to our channel to follow along and learn more about sea turtles! Thank you to our wonderful summer interns for another successful season! Thank you to our educational interns, Haley and Stefani and our sea turtle interns, Ashlyn, Karoline and Chase. You all greatly benefited our program and were such a pleasure to work with. We wish you the best and look forward to seeing what you get up to!
Check out the hit song of the 2021 summer, "Lightsss" by Miss Murtle and her friends (aka our awesome summer interns). Check it out below and feel free to share! Blog Post By: Ashlyn, Sea Turtle Intern
This season, countless campers, vacationers, volunteers, and friends of the turtle patrol have gotten to witness the miracles of both mature loggerhead sea turtles emerging onto land to nest and hatchlings emerging from the sand to make their first crawl back to the ocean. It is the process we don’t necessarily get a chance to witness, however, that is the most miraculous of all in my sight. In those 45-60 days of incubation, in between the time a clutch of eggs is laid and the baby turtles hatch, that embryonic development occurs. That clutch of eggs goes from shell and yolk to a fully formed turtle in less than two months. That in itself is something to marvel over! But what exactly is occurring in that short period of time? The embryonic development of sea turtles can be broken into 31 unique and complex stages! These 31 stages, however, can be categorized into five overall developmental processes. 1. Fertilization—Gastrulation—Early Neurulation After fertilization has occurred, the zygote forms a blastocyst, a multilayered cluster of cells. Reorganization of this cell cluster occurs quickly, as cells move along a central line termed the primitive streak, folding to form three primary dermal layers: the endoderm, ectoderm, and mesoderm. Neurulation initiates in this early stage of development, as cells fold to prepare for the head and spinal cord development. 2. Neurulation—Somitogenesis The neural tube, the precursor of the spinal cord region develops at this stage. The head, brain, heart, and blood vessels begin to develop. Specialized precursor cells called somites begin to form clusters. These somites will eventually differentiate into important structures within the body such as muscles, skin, cartilage, and vertebrae. 3. Somitogenesis—Organogenesis The embryonic cell layers become more complex during this stage, giving rise to tissues and organs. 4. Early Growth All the major bodily organs and systems continue to grow and develop. The limbs, ribs, carapace develop. 5. Late growth—Hatching Growth of the organs and systems comes to completion as the developed sea turtle prepares to hatch from the chamber and emerge onto the beach. In this final embryonic development stage, pigmentation completes and the remaining nutritional yolk decreases. I can discover and mark a sea turtle nest in May and watch the hatchlings emerge in July. But digging deeper, understanding the mechanism for developmental transformation, allows me to gain an even greater appreciation for the circle of life that I have been a witness to all summer long. Perhaps science and miracles go hand in hand. We had our first nest inventory program on Wednesday August 4th and it was a huge success! We had a large crowd close to 200 individuals that we were able to spread out so everyone could see us. We inventoried two nests to determine the nest success. These nests had emerged four days prior. We then counted the hatched eggs, unhatched eggs and on occasions also find live hatchlings. We rooted for one tired looking hatchling as it made it's way into the ocean.
Then on our way back to the office building for one last inventory, we had nest 72 about to emerge! We did not have to wait long and over a hundred hatchlings emerged and made their mad dash to the ocean! We finished the program with one more nest inventory! I was continually asked how often that happens where we also get to witness a nest emerge...and that is a first! I definitely cannot promise any future programs to have this many hatchlings seen but you never know what you may see on one of our programs! Check out below for more information on our nest inventory programs. Our last night walk of the season was a success! We witnessed 4 straggler hatchlings emerge from nest 53 as soon as we walked out onto the beach. Then we had 1 straggler found in nest 49. We continued our walk towards the inlet with the hopes of witnessing an adult nesting. There were no adults found but we did witness a full nest emerge with possible over a hundred hatchlings making their way to the ocean! Our night walks have come to an end this season! We are grateful for the help of our interns and volunteers who have helped to make them happen. I also want to thank all of our participants for their passion for sea turtles and our program! The following morning we found one new nest and for nests that had emerged! See below for pictures taken during the dawn patrol. Our Thursday night walk was a success! We witnessed nest 58 "boil" when the hatchlings emerged all together and headed to the ocean! We walked towards the inlet with the hopes of seeing a nesting adult but unfortunately none were found. There was another nest that was ready to emerge but it was already 12am. A few of our groups witnessed this nest emerge and the rest took the long walk back to the WIFI room, excited to have seen hatchlings.
The following morning, we found that 5 nests emerged! No new adult crawls were found. Blog Post By: Ashlyn, Sea Turtle Intern
Before you ask—no, I wasn’t scheduled for dawn patrol that morning. And by that morning, I think you know that I am talking about the morning that a hatchling loggerhead sea turtle with two heads was discovered here at Edisto Beach State Park. Ask the rest of the turtle team—Leah, Chase, or Karoline—who were all on patrol that morning, about their firsthand account. All I know is that my alarm clock that early morning was a stream of text messages of pictures of this turtle marvel, rather than my typical ringing sound. At first glance of those pictures that flooded my message inbox that morning, my mind sparked with curiosity at this turtle anomaly. How often does the presence of two heads in a single individual occur? Is this common among reptile hatchlings? The head is one of the most complex structures of the body, derived from three primary dermal layers and specialized neural crest cells. The development of the head region of the body during embryogenesis is quite complex, involving hundreds of genes interacting to regulation the proliferation, migration, and differentiation of cells. Within all of these regulatory processes, there is susceptibility to dysregulation, as is to be suspected. In fact, the highest reported mutations in green, loggerhead and, olive ridley sea turtles are craniofacial malformations. The development of brain, cranium, and facial region are interconnected and complex, as the signaling pathways during development have extremely complex regulators and growth factors. Among marine reptiles, sea turtles in particular have a history of reported bicephaly, or the presence of two heads in a single individual. Bicephaly is an umbrella term, describing developmental alterations such as the duplication of head structures, incomplete splitting of zygotes (conjoined twins), or terminal bifucation of the notochord while neurulation is taking place. Research suggests that sea turtles with this condition have an extremely short life expectancy, only hours or days. The rarity of observing this phenomenon has limited our scientific understanding of potential causes of the presence of two heads. It is believed, however, that a combination of genetic, environmental, and developmental causes may all play a role. More research regarding bicephaly in reptiles has been focused on snakes, as the most reported malformation in wild and captive snakes is indeed the presence of two heads. While still a relatively new direction in the field, preliminary research suggests incubation temperatures, inbreeding depression, hybridization, chemical toxins, and environmental pollution all are associated with snake bicephaly. In short, no—no I did not witness the two headed turtle that has been circulating the news this week firsthand. But yes—yes I did marvel and research and marvel yet again at the wonderful anomaly that crawled on our beach. We are in our final week of night walks for this season! We were a little wary about our walk portion of the night walk as a thunderstorm was in Beaufort and it appeared it may decide to make its way towards Edisto. We kept an eye on the weather as we started the walk with the hopes of seeing a turtle before any lightning drove us off the beach. We made our way towards the inlet and then turned around without a sighting yet. It did appear a few nests had already had hatchlings emerge prior to our walk. On the way back to the WIFI room, a turtle was spotted emerging from the ocean. Unfortunately, lightning had become too close to stay out on the beach, so we quietly passed by the turtle and took a detour through the campground. The following morning our dawn patrol team found three new nests and five nests that had signs of emergence! The turtle we saw was nest 196 on our state park beach. See below for a few more photos. We had a wonderful night walk on Saturday, with the hopes of seeing a nest emerge or a turtle come ashore to nest! Unfortunately, we did not get to see any turtle activity during our program. There had been a couple nests that had already emerged prior to us walking. It is always a guessing game as to when they will decide to make their mad dash to the ocean. The following morning there were no new nests or false crawls but the interns and volunteers found that 5 nests emerged!
We had an exciting start to our night walk program on Thursday! One of the nests showed possible signs of emergence, so we brought the night walk group onto the beach as soon as they arrived. We did not have to wait too long and the sand started to "boil" with emerging hatchlings. They successfully made their way across the beach and into the ocean as we cheered them on.
After the hatchlings successfully made it into the water, we went back to the WIFI room for the presentation. Following the presentation, we proceeded to walk the beach in the hopes of seeing a nesting adult sea turtle. Unfortunately no other turtle activity was found but it was a beautiful walk under a bright moon! The following morning our turtle patrol found that three nests showed signs of emergence and no adult tracks or nests were found! |
Leah SchwartzentruberSea Turtle Biologist Archives
September 2023
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