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!

We had an adventurous night walk on Tuesday with a downpour on the walk back to the office and one turtle seen! On our way back from the inlet, Ashlyn came across some campers who witnessed an emerging turtle. The campers did the right thing by keeping a distance and staying still in the dark. Unfortunately this turtle did not find a place to nest and ended up completing a false crawl. The night walk group got to witness her as she went back into the ocean. She had an old injury to her carapace and her rear flipper, so perhaps that was part of her problem in successfully nesting.

The following morning we found 1 new nest and 1 false crawl. We also completed an inventory and found the most unusual find of all, a two-headed hatchling! See below for pictures taken during the patrol.

​Blog Post By: Karoline, Sea Turtle Intern 
​
While on my way to set up for the night walk on Saturday, I received a call from Leah saying that if we hurried, we could potentially catch a boil on the beach! A boil is when the hatchlings emerge from the nest, something that I had never seen until last night. Haley (an Environmental Learning Center intern and sea turtle volunteer) and I put the pedal to the medal, parked the car, and sprinted to the beach. We were expecting to immediately have the hatchlings emerge, but as we know, turtles work on turtle time, so of course that didn’t happen. We arrived at the scene breathless, only to have to sit and wait for 45 minutes. The good thing about the wait, however, was it gave our night walk participants time to arrive and see the hatchlings! Once the little hatchling at the top who I nicknamed the “scout” hatchling seemed to give the “all clear” to the rest of the nest, they all came up and easily made their way to the water. Our night walk participants did a great job and let the hatchlings do their thing!  

​All summer I have been waiting and hoping to see a boil. I’ve even come and looked for hatchlings on my night off! Knowing how our turtles are, I’m sure they thought it would be funny to take their time and hatch right at the start of a night walk  After an exciting start to the walk, we came back to the Wi-Fi room for the presentation. We finished up with some great questions from the group, and then headed out to the beach. This was my first night going out ahead of the group looking for turtles and hatchlings, and I was very excited. I checked all the nests on my way up the beach, while still looking for adult turtle tracks. Finally, when I got to mile marker 0.8 there was an awesome person walking the beach who showed me that there was a turtle in the dunes! I slowly crept up and found that she was laying! The group approached, and we saw a beautiful big turtle lay nest number 185. After she finished, she made her way down to the water and we said our goodbyes. Then, on the way back to the white office building, I saw another track, and lo and behold there was another turtle laying right by the white building! This nest was number 183. I kept an eye on her as the night walk group left, as it was already becoming a late night. It was an awesome “circle of life” night walk with some fantastic night walk survivors!  

On our way to the inlet we spotted turtle tracks but unfortunately she had already turned around and left, creating a false crawl. Walking down just a bit further, we got word that the turtle had already come ashore and then left, leaving a new nest behind. On our way back from the inlet, another track was seen but this time it was just one incoming track. Ashlyn spotted the turtle, still creating her body pit. We patiently waited as she dug her egg chamber before getting a closer look. This turtle situated herself underneath the light screen of nest 10! So while she was nesting, we pulled up some of the light screen stakes. Then while she was covering, she was being extra feisty and was breaking the stakes of nest 10! We got to watch her return to the ocean after successfully laying her eggs. 

The following morning we found three new nests, 2 false crawls and another nest hatched. The nest we saw during our night walk program is marked as nest 179 on our beach. See below for pictures taken from the morning patrol.

The turtles evaded us yet again as we returned from the inlet without a sighting. We still had a fun night walk! We got startled by scurrying ghost crabs, discussed horseshoe crabs, checked out constellations and looked for bioluminescence before a wave soaked all of us!

The following morning they found two new nests and one nest that had emerged! We are now up to 174 nests on the state park beach. See below for pictures taken during the dawn patrol.

Blog Post By: Ashlyn, Sea Turtle Intern

Setting the scene: On every beach spanning the Atlantic Coast from North Carolina to Florida, night patrollers would be walking the beach from dusk until dawn, attempting to encounter every nesting loggerhead that emerges from the ocean to nest along the dunes. Tags must be given to each turtle encountered with thorough documentation occurring throughout the night, and fingers must be crossed that no turtles evade the nightly patrol. A logistical catastrophe.
 
Tagging studies on nesting beaches, the historical common practice to estimate nesting frequencies among other population demographic parameters, cannot obtain the magnitude of samples required for confident determination of sea turtle population demographics. Therefore, Dr. Brain Shamblin and his team at University of Georgia, altered the precedent. Since 2010, the Edisto Beach State Park beach along with beaches all along the Southeastern Coastline have participated in Dr. Shamblin’s genetic study of loggerhead sea turtles, allowing for a deeper understanding of loggerhead nesting population demographics, furthering sea turtle conservation efforts.
 
Rather than a focus on directly on the mother turtle, focus shifts to the eggs to obtain information about the mother. From each nest discovered on the beach, a single egg is obtained from the clutch within 15 hours of oviposition. In its entirety, the egg contains both the mother’s and father’s genetic material; however, the shell of the egg contains genetic information solely from the mother. For this reason, the yolk contents of the egg are sacrificed, and the shell of the egg is preserved in a 70% ethanol solution to allow for the isolation of DNA from the eggshell of the mother loggerhead sea turtle. Genotypes are derived from a single-locus from the unincubated egg shell, with an accuracy rate of 97.6% to the genotype that would have been derived if taken directly from a skin sample of the mother loggerhead.
 
The development of this single locus genotype frequenting technique serves as a groundbreaking noninvasive method in furthering our understanding of sea turtle population demographics. This methodology additionally is applicable to other marine turtle populations in which direct interception of the nesting female is logistically not feasible when genetics studies are being conducted.
 
For more information regarding the nesting patterns of loggerheads on the EBSP beach, visit www.seaturtle.org for maps and data information. For more information regarding the genetic extraction process within the laboratory, visit the website of Dr. Brain Shamblin for links to his published works.

We had a walk to the inlet under a starry sky with plenty of shooting stars! Unfortunately our wishes to see a nesting turtle did not come to fruition, as we returned back to the office without seeing a turtle. There were plenty of fun things to check out along the way including bioluminescence, ghost crabs, fossils and a black-tipped shark.

The next morning our dawn patrol team found 4 new nests and 3 false crawls! These turtles must have come ashore to nest within the hours of 12am and 6am as they evaded us on our walk. We are excited to be up to 164 nests now on our beach! Check out the pictures below taken from our patrol team.

Blog Post By: Karoline, Sea Turtle Intern
​
On June 23 around 2 pm, Leah received a call from a worried beach goer about some turtle eggs that were exposed on the scarp at the inlet. After asking for some more information before going to check it out, she received a video of the nest, and sure enough there were exposed eggs! Turtle patrol is always ready for action, so we jumped in the turtle cart and headed to the scene of the crime. But, after a once over of the inlet, there were no eggs to be found…

Feeling confused, we looked again more closely, and this time found some tiny little white ovals exposed on the scarp. We then realized that the perspective on the video had made the eggs look like they could be sea turtle size (which are about ping pong ball size), but in reality the eggs were much too small to be from a sea turtle. After our revelation that these were not sea turtle eggs, we came to the conclusion that they must be eggs laid by a diamondback terrapin! Diamondback terrapin eggs are oval shaped, pinkish-white, leathery, and about 1 inch long. Though the eggs weren’t laid by a sea turtle, Turtle Patrol is always ready to help a turtle nest in need, and these eggs had to be moved out of the sun ASAP! So, we grabbed our relocation bucket and got to work. This was definitely the quickest relocation I have ever been a part of, since female diamondback terrapins are about nine inches long, compared to our female loggerheads that are about three feet long. Diamondback terrapins nest May through early July at night, similar to our sea turtles that nest May-August at night. Sea turtle nests are about 18-24 inches deep, so it was light work for us to dig a new diamondback terrapin nest in a more secure spot in the dunes with a depth of 4-8 inches. A typical diamondback terrapin nest will also have about 4-8 eggs in a clutch, whereas our loggerhead sea turtles have about 120 eggs per nest. Our nest in need of a relocation had 8! After moving the eggs, we cut up a small section of our sea turtle screens and used some sticks as posts to hold the screen. We then put some orange tape around our little nest and bid it farewell!

Typical egg incubation for diamondback terrapins is about 60-85 days, depending on soil temperature and nest depth. Loggerhead incubation is a bit shorter, about 45-60 days. So, in a couple months or so, we will hopefully have some healthy diamondback terrapin hatchlings make their way from their beautiful new nest to some brackish creeks! If there was to be a prolonged cold snap within the next 60-85 days, however, the hatchlings may decide to “overwinter” in the sand and hatch next spring! 

​Like our loggerheads, females can lay several clutches during one breeding season, so let’s hope this diamondback terrapin’s next nest is in a better location! We loved working on this nest and can’t wait to see the results of our miniature relocation. Thank you to the person who reported it to us! 

Sources:
https://www.chesapeakebay.net/discover/field-guide/entry/diamondback_terrapin 
https://animaldiversity.org/accounts/Malaclemys_terrapin/#:~:text=The%20oval%20eggs%20are%201,and%20covered%20with%20leathery%20shells. 

​

We had another successful night walk on Thursday! On our way to the inlet we got to witness a very large turtle head back into the ocean after completing a false crawl. On our way back to the WIFI room, we had another turtle ashore! She crawled to a very high scarp so we were unsure if she would be able to get above it. There was another turtle further down that just finished laying her eggs, so we quietly passed by the one turtle to witness the successful nester cover and return to the ocean.

The one false crawl had suspicious tracks that almost looked parallel, as if a green turtle was the one responsible! I have sent the photos to DNR for confirmation. I believe it is still a loggerhead but it would be neat if it was a green wanting to nest on our beach. Hopefully this turtle will return to nest successfully!

The following morning we found 1 new nest and 2 false crawls. The nest we saw during our night walk is marked as nest 158 on our beach! See below for pictures taken during the morning patrol.

We had an eventful night walk on Tuesday! As soon as we started to walk, I noticed a dark form crawling out of the ocean between myself and our night walk group! We had a turtle emerging. We thought this may be the shortest night walk to date but unfortunately she decided it was not the spot for her. We got to watch her once she was crawling back into the ocean.

Further down the beach, tracks were seen but the turtles had already come and gone, also completing false crawls. Continuing our trek towards the ocean, another crawl was seen but this time there was only one incoming track. We waited and waited and waited while this turtle was completing her egg chamber. We wondered why it was taking her so long. Finally once she was laying we were able to see that she was missing part of her rear left flipper! No wonder she had a harder time digging. We watched as she covered her eggs and then returned to the ocean.

The following morning, our patrol team marked this nest as 153! This nest was situated too close to the scarp and below the Spring high tide line so a relocation was needed. They carefully moved her 101 eggs to a safer location. In total, our patrol team found 2 new nests and 7 false crawls.

We had a successful program on Saturday night! On our way to the inlet we spotted one turtle and watched her as she crawled into the ocean. Unfortunately this turtle did not nest and was returning after completing a false crawl. On our way back from the inlet, more turtle tracks were spotted near the campground! This time the turtle was ashore and was laying eggs! We got to witness her lay her eggs, cover and then return to the ocean. On our way back there was another emerging turtle! To make sure we did not disturb her, we took a detour through the campground to get back to the WIFI room. 

The following morning, our dawn patrol team found 5 new nests and 3 false crawls. The nest we saw during our night walk program is marked as nest 146 on our beach.

I apologize for the later blog post but this past weekend was a busy one at the park! I hope everyone had a great July 4th weekend!

Blog Post By: Chase, Sea Turtle Intern

When I tell people I’m an “environmental geoscientist'', they typically look at me kind of puzzled - what does the rock guy have to do with turtles?  

Well, surprisingly enough: a lot.

To start, geoscience is a much broader study than geology. Geoscience is an expansion; it is not just the rocks and erosion of geology, but also climate, habitats, food webs, water resources, and the interactions between Earth’s many systems in order to sustain life. 
​

Geoscience is green. It is the study of the ways things connect and web together. It is also rocks and sediments and oceans, but as a geoscientist, I focus on how those rocks, sediments, and oceans interact together to create an ecosystem.

Most importantly, geoscientists focus on the intersections of what we call Earth’s Four Systems: the hydrosphere (the Earth’s water resources), biosphere (everything that lives), atmosphere (climate, weather, and other air-related processes), and lithosphere (rocks and plates). Geoscience is the study of the Earth, meaning that geoscientists must fully understand the ways that the many systems interact with one another, and the results of those interactions.

For example, loggerhead sea turtles, part of the biosphere, live in the ocean, part of the hydrosphere, then nest on our beach, part of the lithosphere, in the right climate, part of the atmosphere. Whereas a geologist might observe the sand, or a climatologist might observe the temperature of the nests, a geoscientist looks at the way that the sand affects the temperature of the nest, which then affects the hatchlings, who, as a keystone species, affect the quality of Earth’s water systems. 

To simplify things, geoscientists study the Earth as a big picture - how one thing affects another, and how the planet relies on those interconnections in order to survive.

For our sea turtles, geoscience plays many roles. Geoscientists can provide insight into the way that the beach erodes and changes, creating and altering sea turtles’ nesting. They observe the turtles’ predators, like ghost crabs and racoons, noting how the effects of the predation not just on sea turtles but also on the predators’ populations. They monitor how storms affect the beachfront and how they inhibit nesting sea turtles. 

I research the ways that our planet and its changing face affect our turtles, and vice-versa. 

Geoscience, although bearing the same prefix as geology, has a different focus than other branches of study. Geoscience is Earth Science. It is the study of Earth’s fickle connections, and the way that life itself interacts with the planet. It is the branch between biology and geology - the science connecting life to earth.

We had a long walk and a late night walk but it was filled with turtle encounters! We witnessed the first turtle returning to the ocean after false crawling. Then this same turtle that later got the nickname "shark bite" due to the large chunk missing from her left rear carapace, tried crawling ashore again. We witnessed her from a distance false crawl for the second time. We are not sure why she was completing false crawls as there was no disturbance to her, I guess she was just looking for that right spot!

Then as we walked down the beach a little further, we witnessed a turtle returning to the ocean after successfully completing a nest! This nest had to be relocated in the morning as she nested below the Spring high tide line.

After reaching the inlet, no other turtles were seen nesting but on the way back we got to see a nesting turtle! At this point, it was past midnight and we were all feeling pretty sleepy and tired but we powered through with the excitement of a nesting turtle. We watched as she laid her eggs, covered and then returned to the ocean.

In the morning, we had 4 new nests and 4 false crawls. The nest we saw is marked as nest 140 on our beach. See below for more pictures taken from the dawn patrol team!

We walked all the way to the inlet without a turtle sighting. There was a set of turtle tracks near the campground but unfortunately it was a false crawl. We still had strong turtle vibes and were staying hopeful as we waited at the inlet, hoping that we would get the chance to see one on the way back.

After walking a short while, a sea turtle was emerging! We patiently waited as she created her body pit and dug her egg chamber. We witnessed her lay her eggs, cover and then return to the ocean. Her length of the carapace measured in at 97.7cm (38.5 inches) and no pit tag was found. We watched as she made her way back into the ocean and disappeared under the waves.

The next morning our dawn patrol team found three new nests and 1 false crawl. The nest we saw during our night walk is marked as nest 130 on our beach. It was below the Spring high tide line so we relocated it. We carefully move her 132 eggs to a safer location. See below for more pictures taken during the dawn patrol.

We had a beautiful starry night walk to the inlet with enough of a breeze to keep the bugs at bay. It was more of a challenging walk with the incoming high tide but we were still able to make it to Jeremy's inlet. Once there, we waited for a few minutes to hopefully let a turtle come ashore. The inlet is a great place to find fossils and one of our participants was able to find a shark tooth in the dark!

There was one turtle that tried to emerge next to the Pavilion stairs but she was unable to find a suitable location. Our night walk group was still able to see her tiny crawl that she left in the sand from her U-turn. Hopefully she was able to find a more suitable place to nest.

The following morning we found one new nest and two false crawls. The new nest is marked as 124 on our beach. See below for pictures taken from the patrol this morning!

Blog Post By: Karoline, Sea Turtle Intern

        Something we often do during dawn patrol is debate relocations. This week, we had several members of the public approach us with questions as we were debating. We don’t take relocations lightly, and oftentimes will be on the fence as to whether or not it is in the nest’s best interest to move it. We always err on the side of caution, which means we will only relocate nests if absolutely necessary. We like to think that in general, the mother knows best, but unfortunately sometimes the nests are just too close to the water to leave in-situ (in its original location).
            Relocations are a powerful and necessary conservation tool for turtle patrols, but they come with their own risks. The main concern we have when moving eggs is rotation, as rotation of the egg can cause the embryo to detach itself from the shell. It’s up to us to decide if the benefit of moving a nest outweighs the risk of rotation or not. The most common cause for relocations is the nest being “too low”, meaning it is below the high tide line. When a nest is below the high tide line, it is at risk of being washed over by the water too many times. Too many wash overs can suffocate the nest and decrease hatching success. On dawn patrol, the main questions are usually: How many wash overs will this nest go through if it stays where it is, and how many wash overs are too many? Even though our instinct and educated debates are usually very accurate in determining the amount of wash overs a nest will receive, I was wondering if there is any research or perhaps a scientific method that could determine a nest’s wash over risk. And, as it turns out, there is!
            Researchers at Florida State University have created a model that does exactly that. The model is currently able to predict the amount of harmful wash overs a nest will receive with 83% accuracy. The model combines the beach slope and wave data to calculate harmful wash overs on the beach. With data from calculated wash overs, researchers then created a risk map, which predicted where nests on the beach were most at risk. Creating a new risk map for a nesting beach every year may sound like a lot of work, but researchers have found that the “time-averaged model” was more accurate than the most recent model from the year before. So, just creating one risk map could benefit a nesting beach for multiple years. That is, however, if the beach is not changed by big hurricanes or storms. In that case, a new map would be needed in addition to the average model.
            With a risk map, we could look at the specific percent risk of harmful wash overs for each nest, giving us more detailed data to use in our dawn patrol debates. Hopefully, the risk map model will become even more accurate and easy to obtain, making it readily available to turtle patrols everywhere!
Sources:
https://eos.org/articles/predicting-wave-wash-overs-for-sea-turtle-nests
https://www.sciencedirect.com/science/article/abs/pii/S0964569118310202?via%3Dihub