All dolphin photography taken under MMPA Permit #21938-03.
May not be used for commercial purposes.
![]() By Mira Johnson, Field Assistant Like many coasts along Florida, the Nature Coast is home to many resident bottlenose dolphins. But what makes this area an exceptionally remarkable field site for the Cedar Key Dolphin Project is the unique behavior called Driver-Barrier foraging, which is known to only take place there. Driver-Barrier foraging behavior is a role-specialized foraging tactic performed by bottlenose dolphins to catch mullet. The behavior fittingly received the name, Driver-Barrier, for its involvement of one individual serving the role of Driver and one or more as Barrier(s) to forage. The interaction begins with a Driver rapidly circling a school of mullet in a clockwise direction. As the driver herds the mullet, Barrier dolphins position themselves by the outlet of the closing circle to meet the Driver. Once trapped in the circle, in an attempt to flee, the mullet leap out of the water where the dolphins await the fish with their heads above the surface (see diagram on the right). What a crazy way to catch fish! But just how do these dolphins coordinate such a complex interaction? This is one of the many questions we are hoping to answer by studying Driver-Barrier using techniques such as video, photography, acoustics, and GPS. Video recordings (i.e., hand held camera, drone, and Insta 360) and photographs help us identify individual dolphins as drivers or barriers and determine how many fish they catch. To investigate the use of vocalizations during Driver-Barrier events, we also submerge hydrophones (underwater microphones) in the water. This device allows us to record whistles that we otherwise cannot hear from the surface! The GPS lets us pinpoint where the Driver-Barrier behavior happens, while the drone allows us to obtain an aerial view of the behavior. Observing from this unique perspective has been very helpful in understanding how the Driver and Barrier work together to herd fish. To see Driver-Barrier in action, watch our video at YouTube! From our research, we have learned a lot about this fascinating role-specialized behavior. One of the things we have learned from using acoustics is that echolocation is likely the cue used to coordinate Driver-Barrier behavior. During a Driver-Barrier event, there is a notable lack of whistles which suggests that dolphins must be relying on some other cue than vocalizations to coordinate movement. It is unlikely that the primary cue is visual, as the low water clarity in which Driver-Barrier takes place makes for poor visibility. Therefore, it is thought that dolphins are listening to and reacting to each other's clicks.
Interesting! So echolocation does seem to help coordinate this behavior. But then the question becomes, who is responding to who? Research suggests that Barriers are likely listening to the Driver’s echolocation to coordinate movement and timing. However, whether the Barriers are using the driver’s echolocation directly or indirectly (i.e., eavesdropping) is still unclear. As you can see, although there is a lot that we have learned from studying Driver-Barrier, there is still much to be uncovered. As we look forward to this field season, we hope to continue to gather data on Driver-Barrier that will hopefully help us answer some of our next questions, like 1) does every Driver and Barrier work a foraging event in the same way or are there differences in technique? 2) How do dolphins learn this behavior? Is it from their cohorts or from their mothers? All good research leads to more and more questions to be answered! To learn more about Driver-Barrier, please feel free to read some of the publications by Dr. Gazda and colleagues referenced below. You can find PDFs in our publications section on our website. Hamilton, R. A., S. K. Gazda, S. L. King, and R. C. Connor. 2022. Bottlenose dolphin communication during a role-specialized group foraging task. Behavioural Processes. 104691. https://doi.org/10.1016/j.beproc.2022.104691 Gazda, S.K. 2016. Driver-barrier feeding behavior in Bottlenose dolphins (Tursiops truncatus): new insights from a longitudinal study. Marine Mammal Science. doi: 10.1111/mms.12314 (PDF) Gazda, S.K., R.C. Connor, R.K. Edgar, and F. Cox. 2005. A division of labour with role specialization in group-hunting bottlenose dolphins (Tursiops truncatus) off Cedar Key, Florida. Proceedings of the Royal Society of London Series B-Biological Sciences. 272: 135–140.
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![]() By Jolinde Vlaeyen, Lab Manager Have you ever wondered if dolphins have conversations like we do? This is exactly what we are aiming to answer with this year’s field season! We will dive into the environment of the Cedar Keys’ bottlenose dolphin population to investigate how these intelligent mammals take turns during their underwater "conversations”. Why dolphins? I am currently a PhD student with the Comparative BioCognition lab in Osnabrück, Germany, where we all investigate turn-taking abilities in different species, with the goal to show that humans are not so unique in this aspect of communication. Specifically, I am doing this, while comparing wild bonobos, who I followed for 10 months in the middle of the jungle in the Democratic Republic of Congo, and wild dolphins, here around the Cedar Keys. Most of my research has been on primates in the past, but when I came to the CKDP as a field assistant for the first time in 2018, I saw so many similarities between dolphins and primates! Except for the different environment they live in, and a 95 million-year evolutionary gap, dolphins exhibit remarkable similarities in behavior and cognitive abilities. For example, both dolphins and bonobos live in fission-fusion societies, meaning they meet different individuals on a daily basis. The Human-Dolphin Connection Turn-taking is a cornerstone of human communication. When we talk, we follow structured rules about who speaks when, ensuring our conversations flow smoothly. This seamless exchange happens in a blink of an eye, showcasing our cognitive skills. But is this ability unique to humans? Recent studies suggest otherwise, pointing to similar behaviors in birds and social mammals. Now, for the first time, we will be investigating what turn-taking looks like in bottlenose dolphins, a species known for its complex vocalizations and social behaviors. Dolphins use distinct whistles, unique to each individual, to communicate, and often respond to each other within a second—much like humans. They also adjust their vocalizations based on their social context, suggesting advanced communication skills. What do we want to learn? We want to answer the question of whether bottlenose dolphins exhibit elements of human conversational turn-taking during their social interactions. For example, how quickly do dolphins respond, and will this be similar when using different methods(e.g. vocal vs gestures)? Will dolphins respond to a specific signal with the exact same response all the time, and if they do not receive an appropriate response the first time, will they elaborate and/or repeat a signal? Do dolphins use cues to make the recipient understand that it's their turn to respond? Therefore, we will look at dolphin communication in different contexts, such as mother-calf interactions, or group foraging and traveling. Specifically, we will look into four elements of turn-taking that are based on what we see in humans: 1. WHO takes the next turn; 2. HOW turns are organized; 3. WHEN responses occur; and 4. WHAT the next turn should be. How will we do this? To explore dolphin turn-taking, we will use a variety of tools:
Be sure to follow us on Facebook, Instagram, X, and TikTok to see updates about the dolphins’ signature whistles. We hope to share examples there soon! By Mira Johnson, 2024 Field Assistant
Hello! My name is Mira Johnson, and I am excited to be one of the CKDP field assistants this summer! I recently graduated from Lawrence University where I majored in Biology with a special interest in marine mammal behavior. My interest in marine animals began at a young age over many trips to the Monterey Bay Aquarium and tidepools of California while visiting my grandparents during winter break. In my second year of college, I participated in my university’s small Marine Program where I had the opportunity to conduct a study on the cleaning behavior of reef fish. This experience confirmed my interest in marine biology as the field I wanted to pursue further while awakening in me a newfound interest in animal behavior. Living in the Midwest, most of my research experience in animal behavior has been on terrestrial wildlife and freshwater organisms. The summer of my sophomore year I had the opportunity to work with the Wisconsin Department of Natural Resources Snapshot program to conduct research using camera traps to study wildlife populations. This study was where I was first introduced to cameras as a useful tool in the study of animal behavior. The following summer, I worked as a Lawrence Summer Research Fellow at the Center for Limnology Trout Lake Station. There I conducted a study that experimented with infrared videography to study the migration patterns of freshwater zooplankton in northern WI lakes. I am very excited to be drawing upon the methods I practiced in these previous experiences (i.e., photo identification, data entry, fieldwork, etc.) and applying them to my interest in marine mammal behavior. Spending a summer working with the CKDP team seems like the perfect introduction to what it is like to study marine mammal behavior before committing to a graduate program in the next few years. As I am interested in cameras as a tool for studying animal behavior, what I am most excited about this summer is learning about how audio recordings and drone footage can be used to quantify behavior. I am curious to learn about how these various techniques can be used to study how dolphins communicate and engage in coordinated or synchronized behaviors. Working with the CKDP this summer is a fantastic opportunity to grow my understanding of communication and cooperative foraging tactics in bottlenose dolphins through hands-on field and lab work. I can’t wait to be part of the team and hope to get the chance to observe driver-barrier foraging in action! By Carrie Cramer, returning Field Assistant I’m so excited to return to CKDP for my second summer as a field assistant! There is a lot to look forward to this season. I’m most excited to get back on the water and observe lots of fascinating dolphin behaviors! I’m also really excited that CKDP was able to acquire a new boat, which will hopefully allow for plenty of field days to collect all of the data needed for the ongoing research projects.
I can’t wait to see what drone footage we are able to capture this year. This provides a unique visual perspective on dolphin behaviors, such as communication through physical interactions and cooperation during “driver-barrier” foraging. While observing these events from the boat is very exciting, the drone footage can give us a much clearer view of the scene, which allows us to more effectively document and study the behaviors. I’m also looking forward to collecting more acoustic data. Some of my favorite moments from last year were listening to vocalizations picked up by the hydrophones in real time during dolphin sightings. Sometimes, we’re lucky enough to see a dolphin produce a stream of bubbles, which indicates that they are vocalizing. We can then potentially use this observation to identify the individual’s unique “signature whistle” vocalization pattern in the concurrent acoustic recording. Several new “young of the year” have already been spotted on pre-season field trips this spring. I’m looking forward to figuring out who their mothers are and monitoring them throughout their vulnerable first year of life. I hope that we will also come across many of the calves born last year. I’m interested to see how much they’ve grown and changed. They have likely gained new nicks, notches, and scars on their dorsal fins, which we use to identify them. Some of the most valuable learning experiences I had last field season came from working with the CKDP team to tackle all of the unexpected challenges that arise during fieldwork. I feel very fortunate to be able to continue learning from this team while contributing to CKDP’s incredible research! By Jolinde Vlaeyen, Lab Manager After a rather challenging field season last year, the CKDP is gearing up to resume data collection on the unique dolphin population residing around the Cedar Keys. Working with wild animals always requires adaptability, but encountering unusually large dolphin groups made data collection particularly tricky last year. Additionally, technical issues with our equipment, including drone malfunctions and boat engine troubles, added to the setbacks, leading to frustrating delays in data collection. Despite these obstacles, with the community's help, we were able to overcome the challenges and gather valuable insights, including exciting observations of new behaviors and vocalizations.
This year, we are hopeful, as it started with quite some positive news. So far, we secured three (!) grants, which is making this summer’s field season possible. We sold our previous boat (which will be highly missed) and acquired a new one, upgraded some of the equipment, meaning that we are hopeful that this year’s field season, our primary concerns will now be limited to the unpredictable elements and the behavior of the dolphins—both factors beyond our control, but familiar challenges nonetheless. We are also thrilled to welcome back a familiar face to the team: Carrie, a returning field assistant who contributed invaluable efforts last year, particularly in photo-identification tasks that continue year-round. Additionally, we welcome Mira, our second field assistant to this summer’s team! The CKDP has managed to go out on the water a few times before the start of the field season, which have yielded sightings of many dolphin calves, marking a promising start to the season! Now, we eagerly embark on the task which we call “calf mysteries”, which is basically associating calves with their mothers, which is not always the easiest thing to do! Calves are supposed to be with their mothers at all times, but other dolphins enjoy being around the calves as well, so it is always easier to see the calved and their mothers multiple times for us to be sure who the mother is. Altogether, this deepens our understanding of dolphin life histories through long term ongoing observation. As with last year, our focus remains on deciphering the communication patterns among dolphins. While much is known about their vocalizations, regarded for their cognitive complexity, there's still a gap in our understanding of non-vocal forms of communication—a parallel to human conversations that involve gestures and body language. Specifically, we're intrigued by the extent to which dolphin interactions mirror our own, encompassing vocalizations, body signals, and gestures. Our daily routine on the water involves actively seeking out dolphin groups, capturing vital data such as group size, location, and the presence of calves. We deploy underwater microphones (hydrophones) to record vocalizations, including the distinctive "signature whistle" unique to each dolphin, facilitating individual identification. Simultaneously, drone technology affords us a bird's-eye view, capturing intricate body movements and gestures that elude observation from the boat. Identifying dolphins by their dorsal fins, we meticulously photograph each individual—a task requiring skill and patience, especially when confronted with groups numbering 40 or more. This year, we will also focus on expanding our aerial footage to document the various foraging techniques employed by the dolphins, including the unique "driver-barrier" method, wherein dolphins collaborate to catch mullet above the water's surface. This will allow us to compare such foraging techniques with other dolphin populations along the Florida coast. As we look forward to the upcoming season, we remain optimistic that we will achieve even greater success in our research endeavors! Continuing on the them of the last blog post, we asked the field assistants to answer a fun "exit interview" about their experiences this summer! Here are Nemo's answers!
What surprised you about this work? I was pleasantly surprised by how interested people were in the work we’re doing. What surprised you about the dolphins? With the dolphins I was surprised at how much their travel patterns vary. Some individuals stay in pretty much the same spot and some will bounce back and forth between locations, travelling astounding distances in the span of a couple of days. Favorite dolphin experience? My favourite dolphin experience was seeing a newborn baby dolphin a couple of days before the field season wrapped up. Favorite place to boat to (dolphins or no)? In terms of location, my favourite place would be Wacassassa Bay because I loved trying to spot gators chilling by the river. Favorite dolphin of season? My favourite dolphin is Twistie Tie, closely followed by Lulu (LUMM) who I affectionately referred to as Beluga Whale Fin. Most memorable day or moment on the boat I think the most memorable day on the boat was definitely the rescue operation where we tried to get cover netting off of a baby dolphin we had been keeping tabs on all season. The rescue was pulled off pretty successfully with minimal inconvenience to all parties involved, including the dolphins. What would your advice be for future assistants? My advice to future assistants would be to stock up on sunscreen and be prepared to work. It is physically demanding but incredibly rewarding and a fantastic opportunity to observe these intelligent animals in their natural habitat. Key food item for the field A key food item for the field is chocolate. Or anything sweet. Favorite/memorable phrase or saying? A memorable phrase that I won’t ever be able to get out of my mind is ‘up at your 3 o’clock’. (EDITOR'S NOTE: we use a clock system to describe the relative position of the dolphins to the boat) What do you wish you had brought with you this season? I wish I had brought a bigger water bottle with a lid that was easier to open. Most valuable item for the boat? Most valuable item for the boat is a hat. A wide brim hat with protective neck covering because that will protect you from the sun better than anything else. As the weather turns towards fall and we are entering our regular population surveys, it is fun to look back at the summer field season! We asked the field assistants to answer a fun "exit interview" about their experiences! First up is Carrie! Read what she wrote below. Check in later for Nemo's answers!
What surprised you about this work? I was surprised by how challenging it is to research dolphins in Cedar Key and the surrounding areas! The water is extremely shallow and murky, making it difficult to navigate the boat around obstacles. Some of the places where we frequently spot dolphins are only accessible to us (and the dolphins) at high tide. The murkiness of the water also often makes it impossible to see dolphins underwater, so quick reaction times are necessary to get good pictures of dolphins when they surface. On top of these challenges, the summer heat and humidity is no joke! This experience made me really appreciate how much time and effort goes into field work, and how amazing it is that CKDP is able to collect great data on these animals! What surprised you about the dolphins? I was surprised by how much time these dolphins spend socializing! Observing them in the wild made it clear how incredibly important social behavior is in their lives. I knew that lots of research had been done on how dolphins communicate vocally, but I was surprised to observe how important physical touch is in their communication as well. I was also surprised by how many different specialized techniques these dolphins use to forage. It made me so curious about what environmental and social factors influence how they forage and how these behaviors are learned. Favorite dolphin experience? My favorite experience was following two mom-calf pairs through narrow, mangrove-lined canals in the backwaters of Waccasassa. I always love watching moms and their calves interact with each other, but this experience was extra special because the area was so naturally beautiful and felt very remote from the outside world. When we emerged from the canals into Waccasassa Bay, they joined up with a huge group of socializing dolphins, which was so fun to watch! Favorite place to boat to (dolphins or no)? Waccasassa Bay was my favorite place to boat! It’s within a beautiful nature preserve that gives you a glimpse into what Florida’s Gulf Coast used to look like before development. We saw lots of large social groups of dolphins in this area, which were difficult to collect data on but really interesting to observe! Favorite dolphin of season? On my first field day, I somehow managed to take a picture of Crayfish (CHWE) leaping fully out of the water, right alongside our boat! He or she quickly became my favorite for giving me that fantastic photo op. We saw Crayfish many more times throughout the field season. His or her dorsal fin is easy to identify in the field, with its large triangle-shaped notch and vertical rake marks. Most memorable day or moment on the boat The most memorable day on the boat was definitely the last day of our field season, when CKDP partnered with the Sarasota Dolphin Research Program and UF Marine Animal Rescue to disentangle a calf who had plastic netting wrapped around its body and pectoral fins. We had been monitoring this entangled calf for weeks, so it was really gratifying to finally see it be released from the netting. The situation gave us a unique opportunity to collect data on the mom-calf pair’s behavior and communication before, during, and after the disentanglement, so I’m excited to see what we learn from this. What would your advice be for future assistants? The hardest part of the role for me was dealing with the heat on the boat. Make sure to drink tons of water, reapply sunscreen every two hours, and get comfortable with being drenched in sweat! Any skills related to boating and action photography would be super useful for field assistants, but don’t worry if you don’t have them - I certainly didn’t. Most importantly, stay curious about what you observe and how much more there is to learn about these animals. This is a great learning opportunity, so ask tons of questions and be open to feedback about how you can improve your skills. Key food item for the field Watermelon tastes incredible on the boat! Favorite/memorable phrase or saying? Everyone on the boat yelled “KNUCKLES!” every time the dolphin named Knuckles came up for a breath. I’m not sure why it was so funny, but it got me every time. “Hydrate or diedrate” was also a good one. What do you wish you had brought with you this season? I wish I had brought some long-sleeve fishing shirts or UV protection shirts to help keep me cooler and reduce the need to constantly slather my arms with sunscreen. Most valuable item for the boat? A good pair of polarized sunglasses is absolutely essential for protecting your eyes from the sun and spotting dolphins! They also help you see things underwater, like dolphins, other cool animals, or oyster bars that you are about to run into. ![]() By Stefanie Gazda, President of CKDP One of the many roles that the Cedar Key Dolphin Project plays is to assist in any way possible if an animal is in crisis. Fortunately there are not that many of those calls in our part of the world (likely due to fewer people along the coast and less pollution/trash in the waters). In the middle of July that change and added an extra dimension to our field season. We received a call from UF Marine Animal Rescue (UF-MAR) in mid-July that there was a report of a possibly entangled calf off of the City Beach in Cedar Key. UF-MAR was able to find the dolphin right away, and we joined them shortly afterwards to take photos of the mom and calf to see if we could identify them later on land. We were actually able to ID them right away because we had seen them so much this summer: the mom was NLCT (Nail) and the calf was DTNL (Dit), a young of the year (YOY) believed to have been born in March of this year. It's not as simple as it might seem to grab an entangled dolphin and take the line off. First, dolphins are protected by the Marine Mammal Protection Act, and any harassment of a dolphin at that level needs permission from NOAA, even from trained responders. Second, this is a calf under six months old: they are very vulnerable to stress, and there is a risk of causing more harm to the infant by trying to disentangle it without being very strategic about it. Last, we didn't know exactly how entangled the calf was: it was acting like a normal calf, frolicking around its mom and swimming normally. More research was needed, and this is where we came in. While UF-MAR worked on coordinating a response with NOAA, we continued over the next several weeks to monitor the calf and mom. We were able to provide a sighting history of the mom and calf to UF-MAR and the responders: NLCT is known for going in the backwaters along Channel Three and behind Scale Key. For all the years that we've collected data on her (since 2018), she's always around Dog Island, the City Beach, and behind Cedar Key. This was good and bad news. Good news: that she's a resident and doesn't go very far so we'd likely be able to find her again. Bad news: if you've ever gone through Channel Three, you know there is a lot of stuff for a boat to get hung up on. That makes an attempt to disentangle a calf even more difficult if you are dodging oyster bars. While we waited for the schedules of trained personnel, weather, tides, and wind to match up, UF-MAR determined that the material surrounding the calf was cover netting, which is one of the biggest marine debris problems in Cedar Key. CKDP was able to capture drone footage (allowed under our research permit, without which we would have to fly our drone at an altitude of at least 400 feet) and found that the netting was also wrapped around the calf's pectoral fin. We also relied on information from Captain Phil at Tidewater Tours, who told us where and when he saw the calf, whenever he saw them. This gave us more information about their habits and more data for the team. We took behavioral data at every sighting and luckily DTNL appeared to be healthy and vigorous, which was great news. Still, DTNL is a rapidly growing baby and that netting had to come off as soon as possible. Finally, the weather and people all lined up and the Sarasota Dolphin Research Program (SDRP) at Mote Marine Labs sent two trained personnel to disentangle the calf remotely (you can read their account here). Instead of using a net to corral the calf, they would try to grab the line with a long pole. Using a net is difficult even in beautiful waters, but given the combination of the silt in the water in Cedar Key, the oyster bars, and the calf's young age, a pole was the safer choice. On August 9th, CKDP and UF-MAR launched their boats and we searched all along the waterfront. After three hours, the CKDP boat found NLCT and DTNL traveling around Dog Island. While we waited for the UF-MAR boat to approach, we took more behavioral data and photos. Once the UF-MAR boat was on site, the SDRP personnel got to work, carefully approaching mom and calf in a slow and steady manner with the boat while one of them held a long pole with a grapple on the end of it. Within 20 minutes they made their first attempt to grab the line as DTNL approached the boat. DTNL tail-slapped and dove down, but the action of drawing the grapple across the dolphin caused the netting to snap! It's unclear if the grapple made significant contact with the calf, but most likely it was a combination of DTNL flinching, the netting starting to degrade, and contact with the grapple that freed DTNL. After the disentanglement, the CKDP moved in to collect behavioral data to make sure that DTNL was not too stressed out by being touched by the metal grapple pole. Calf and mom continued to surface normally and closely together, which is great. There seems to be some scarring that DTNL has from the netting, which they will likely carry forever, but think of the story they have to tell now!
We will continue to monitor this calf and mom to make sure that both animals are doing well. Many thanks to UF-MAR, SDRP, Tidewater Tours, and those that offered to help us out when our boat was down for maintenance. We are so grateful for your support! We continue to collect data for specific research questions, as well as baseline monitoring of the population, which are invaluable in making operations like this rescue possible. We will be looking for a new (used) boat within the next year, and we are asking for any financial help you can lend us. Your donations are tax-deductible and will go a long way in helping us achieve our long-term research goals by staying on the water. Remote disentanglement was conducted at the request of NOAA, the federal agency responsible for overseeing the stewardship of marine mammals in U.S. waters, under Permit No. 24359 issued to NOAA’s Marine Mammal Health and Stranding Response Program. Dolphin photography taken under MMPA permit 21938-03. May not be used or reproduced. By Jolinde Vlaeyen (PhD Candidate and Lab Manager)
Dolphin research is not all about fun and spending time collecting data on amazing dolphins, it also comes full of challenges, whether it is the behavior of the dolphins, the weather, or all the technicalities of planning a smooth sailing field season. This season especially has been intense with all of these things. One of the challenges that we deal with every season, is working with wild animals, who definitely have a mind of their own. As such, we usually need to adapt following what they do, which is what science is. However, this year the dolphins have been behaving quite different compared to otheryears; we see them very often in the same places, in very big groups (±30), and rarely in small groups. For this year’s data collection, this is rather frustrating, because to answer my research questions, small groups of dolphins are preferred. This way, we can more easily identify who vocalizes, who responds, and see on the camera and drone what is happening underwater. When the dolphins are in big groups, it is rather difficult to follow each individual. Why they are behaving differently this year is still something we’re trying to understand. Other researchers around Cedar Key mentioned that the turtles and the sharks are also behaving differently this year, so my bet is on climate change. Another challenge is the weather. Because we have a small boat and because dolphin spotting becomes harder once the waves become bigger, we can only go out on the water when the weather is near perfection: glassy waters, barely any swell, and no rain. Usually, the mornings in this area are as described, and the wind and/or rain pushes us back on land between 2-4pm. Yet, this year, rain and storms have been too common in the mornings, meaning we cannot go out, and a side effect of this is that the water has been murkier for longer periods, and therefore not easy to see the dolphins through it with the drone. The biggest challenge this year however has been technicalities. We are using a combination of a drone, so we are able to also see what they do from a different angle, as well as acoustic recordings. We have been fighting the drone this season, as it created a lot of issues for us, and some were fixable, others were not. We were able to buy a new one, but that one failed, and then tried another one which also had issues. That drone has been discontinued, so, we decided to buy a different brand, which is not waterproof, meaning we need to be extra careful catching it on the boat. Because we are a small NGO, these decisions need to be taken carefully, because we do not have the money to buy multiple drones at once. The other big issue has been the boat engine, which has had multiple different issues over this season. All of this means a lot of waiting, either for the drones and engine parts to be shipped, and then the fixing itself as well, resulting in days of less or no data collection. What has been amazing is the community feeling in and around Cedar Key. People have generously offered to lend us their boat; while we were fixing our engine at the dock, others have tried to help us out in the nicest ways; and our mechanic has been very helpful and fixing our boat issues fast as possible to get us back to doing research ASAP. I could not be more grateful for how everyone has been involved and helpful! Thanks to this, we have had a great run these past days, have finally been able to get the data we needed, and observed amazing – and maybe even new – behaviors in combination with some vocalizations. Let’s hope this field season ends on this high note! As much as this season has been the most challenging one just yet, this year for me has been the best year with the Cedar Key Dolphin Project, and I will be back next year! Hello! My name is Carrie, and I’m a CKDP field assistant this summer. I can’t believe we’re already almost halfway through the field season! In June, thunderstorms kept us off the water for more days than we would have liked, but we’ve still had many field days so far, and have encountered lots of dolphins on each of these days. Thankfully, we have plenty of data to keep us busy in the lab when we can’t go out! I’d love to give you an idea of what a day in the life of a field assistant is like on field days.
Our day starts at 6 AM, when Jolinde, our field manager, checks the weather radar, wind speed and swell height to make sure that conditions are good for spotting dolphins and staying safe on the boat. We then eat breakfast and pack up the equipment. The “data cooler” holds our DSLR camera, handheld video camera, GPS, datasheets, and lots of spare batteries. Another cooler holds our water bottles, sandwiches for lunch, and an abundance of snacks. We pack the coolers, along with acoustic and drone equipment, into the truck, and hook up the boat trailer. We then head to one of our launch locations. This year, we’ve launched from Cedar Key, the Waccasassa river, and Yankeetown. Jolinde chooses our launch location based on a combination of factors, including weather, expected boat traffic, and water depth. The coastal waters in this region are very shallow, so we are often boating in a meter or less of depth while navigating through obstacles like oyster bars and crab pots. When we get to the boat ramp, we load the equipment into the boat, prepare the boat for launch, and then we are off! While on the water, we’re constantly scanning the horizon for dolphin dorsal fins. We’ve been lucky to have several mornings lately where the water is so calm and glassy that it’s almost hard to tell where the water ends and the sky begins, and cotton-candy-like clouds are reflected onthe water’s surface. When the water is choppier, though, dorsal fins can be camouflaged by the waves. It’s also easy to confuse other animals for dolphin activity. Ospreys and pelicans plunge into the water, creating huge splashes. Cormorants bob on the surface. Fish cause ripples and splashes, and mullets launch themselves into the air. Boulder-like manatee snouts emerge to take a breath, while sea turtle heads poke out of the water like periscopes. When someone yells, “dolphins!” and we confirm that we have indeed spotted dolphins, we begin to approach them. Boaters are required by law to stay 50 yards away from dolphins, or to continue on their course if dolphins approach their boat. CKDP has a research permit that allows us to approach and follow dolphins at a closer distance. A flag on our boat lets other boaters know that we are performing dolphin research under a permit. When we arrive at the dolphins, we begin a “sighting,” where we collect photo-ID and behavioral data. Sightings can last from five minutes to an hour, and we usually have multiple sightings per day. During a sighting, one field assistant takes photos, with the goal of taking at least one clear photo of both sides of each dolphin’s dorsal fin. Individuals can be identified using the unique pattern of notches on their dorsal fins, caused by other dolphins, sharks, or boats. They can gain more notches throughout their lifetime, but they don’t lose them (unless they are overlapped by new notches). Their scars, which may fade over time, and dorsal fin shapes can also be helpful for identification. Dolphins with “clean” fins, who are usually calves, are the hardest to identify. Taking photos of dolphins can be extremely difficult, because they only surface for about a second and can stay underwater for long periods of time. Some dolphins are more “photogenic” than others, meaning that they tend to surface frequently alongside the boat, making the camera person’s job easy. Dolphins who don’t surface often or frequently change directions can be very challenging to photograph. Calves are especially difficult to capture, because they surface faster than adults. The more dolphins there are, the more difficult it is tokeep track of where they all are and which fins have already been photographed. We have had many chances to practice this so far, because we’ve frequently encountered large groups of 20 or more dolphins socializing. The camera person and boat driver work together to constantly position the boat in places where we can take photos at good angles. Another field assistant is in charge of filling out the datasheet. This is also a collaborative process; everyone on the boat discusses what we are seeing. We record information about the time, location and conditions of the sighting. We also estimate the number of dolphins present in the sighting, distinguishing between adults, calves, and young-of-the-year (YOYs), which are calves that were born this year. We estimate these age categories based on the size and behavior of the dolphins. Calves up to three years old are generally no more than half the size of adult dolphins, and YOYs are even smaller. YOYs don’t have fully developed motor skills, so they often stick their face out of the water when they surface to breathe, and they surface very quickly. YOYs also tend to swim in “baby position” alongside their mom. We also record information about how spread out the dolphins are from each other, whether there are subgroups within a larger group, when dolphins join or depart from the group, and how they are moving around the area. We record information about the activities that the dolphins are performing, which could be traveling, foraging, socializing, or resting. My favorite part of data collection is observing and recording specific foraging and social behaviors. Dolphins in this population have several different foraging techniques, including the cooperative driver-barrier (DB) foraging behavior that is unique to this population, as far as we know. We haven’t gotten a good look at DB yet this season (we are not specifically searching for it this year), but I hope I have a chance to witness it. We have seen other interesting foraging techniques, like “fast swimming,” where dolphins accelerate very fast to chase a fish, sometimes creating a rooster tail at the surface with their dorsal fin. We saw a dolphin named Eller toss a Crevalle Jack fish into the air several times, perhaps to stun it. We’ve seen several dolphins “bottom grubbing,” where they stick their snout into the mud and root around for fish. This requires them to kick their flukes at the surface to keep their body pointed downwards, creating huge splashes. We got to see Nail bottom-grubbing with her YOY watching nearby. My favorite foraging encounter so far was watching Knuckles perform “kerplunking,” where he forcefully dives into the water and holds his body in a curved position so that his tail slaps against the surface as he enters the water, presumably to stun fish. Although this behavior is seen in some other bottlenose dolphin populations, Knuckles is the only individual in this population who has been observed kerplunking. I would love to find out how these dolphins learn these behaviors and how this knowledge is transmitted throughout the population. |