As one of the largest predators to have ever lived, megalodon captures people's imagination - and for good reason. But was this apex predator simply a beefed-up great white shark, and is it still lurking in the dark depths of the ocean?
The earliest megalodon fossils (Otodus megalodon, previously known as Carcharodon or Carcharocles megalodon) date to 20 million years ago. For the next 13 million years the enormous shark dominated the oceans until becoming extinct just 3.6 million years ago.
Estimates suggest megalodon actually grew to between 15 and 18 metres in length, three times longer than the largest recorded great white shark. It may have been comparable in length to today's biggest whale sharks, the largest of which has measured in at 18.8 metres.
Emma explains, 'With its large serrated teeth megalodon would have eaten meat - most likely whales and large fish, and probably other sharks. If you are that big you need to eat a lot of food, so large prey is required.'
Humans have been measured with a bite force of around 1,317 Newtons (N), while great white sharks have been predicted to be able to bite down with a force of 18,216N. Researchers have estimated that megalodon had a bite of between 108,514 and 182,201N.
O. megalodon likely had a much shorter nose, or rostrum, when compared with the great white, with a flatter, almost squashed jaw. Like the blue shark, it also had extra-long pectoral fins to support its weight and size.
'A lot of reconstructions have megalodon looking like a bigger version of the great white shark because for a long time people thought they were related,' explains Emma. 'We now know that this is not the case, and megalodon is actually from a different lineage of shark of which megalodon was the last member.'
The oldest definitive ancestor of megalodon is a 55-million-year-old shark known as Otodus obliquus, which grew to around 10 metres in length. But the evolutionary history of this shark is thought to stretch back to Cretalamna appendiculata, dating to 105 million years old - making the lineage of megalodon over 100 million years old.
'As we've found more and more fossils, we've realised that the ancestor to the great white shark lived alongside megalodon. Some scientists think they might even have been in competition with each other,' says Emma.
Sharks continually produce teeth throughout their entire lives. Depending on what they eat, sharks lose a set of teeth every one to two weeks, getting through up to 40,000 teeth in their lifetime. This means that shark teeth are continuously raining down onto the ocean floor, increasing the chance that they will get fossilised.
As the adult sharks were dependent on tropical waters, the drop in ocean temperatures likely resulted in a significant loss of habitat. It may also have resulted in the megalodon's prey either going extinct or adapting to the cooler waters and moving to where the sharks could not follow.
A study from 2022 suggests that competition with great white sharks for food may also have contributed to megalodon's downfall. Studies of fossilised megalodon and great white teeth show that their diets overlapped.
The sharks would leave telltale bite marks on other large marine animals, and their huge teeth would continue littering the ocean floors in their tens of thousands. Not to mention that as a warm-water species, megalodon would not be able to survive in the cold waters of the deep, where it would have a better chance of going unnoticed.
The program lasts for approximately 90 minutes and includes an educational and engaging orientation on the biology, care, training, study, and conservation of different shark and ray species; an exclusive behind the scenes look at the shark habitat; an immersive encounter experience, and presentation of a souvenir photograph.
Guests will have the opportunity to have an intimate, up-close experience with sharks and rays. There are a variety of activities that can take place at the discretion of the Aquarium staff while interacting with and even touching the animals. Participating in training techniques and feeding may be part of the experience if it is appropriate to do so based upon the discretion of the program staff. Each program is tailored to ensure a safe and engaging experience for both our animals and our guests. As a result, each program may be a little different.
Governor Kathy Hochul today announced measures in place to protect beachgoers from sharks at Long Island State Park beaches this summer. The New York State Office of Parks, Recreation and Historic Preservation, Department of Environmental Conservation and the New York State Police will increase surveillance including drone, watercraft and helicopter monitoring along the Long Island State Park Beaches. These measures build upon the Governor's actions taken to address and enhance beachgoers' safety with an increase in shark sightings last summer.
"With New Yorkers and visitors alike preparing to enjoy our beautiful Long Island beaches all summer long, their safety is our top priority," Governor Hochul said. "This year we are taking further action to protect beachgoers by increasing surveillance to monitor for shark activity near beaches off the South Shore. I encourage all New Yorkers to listen to local authorities, follow guidance and take precautions to ensure a safe and responsible beach trip this summer."
The New York State Office of Parks, Recreation and Historic Preservation (State Parks) held a pre-season meeting in April with beachfront municipalities and local agencies to provide the latest information on shark activity in New York State and discuss coordinated beachfront notifications. State Park Police and Department of Environmental Conservation Police Officers will coordinate patrols at the request of specific parks in the event of a probable shark sighting.
New York State Parks Commissioner Erik Kulleseid said, "The action being taken along the South Shore of Long Island will give us eyes in the sky and along the coastline. Over the past two seasons, we've learned that drones are the most effective mechanism to detect environmental conditions that could attribute to shark activity. We are expanding patrols with drones and watercraft to help prevent the rare occurrences of negative shark interactions with swimmers, surfers, surf fishermen, and boaters at our beaches."
New York State Department of Environmental Conservation Commissioner Basil Seggos said, New York's ocean beaches and coastline are part of a wild and natural marine ecosystem. Sharks are a vital part of this ecosystem, and they play an essential role in maintaining a healthy and balanced ocean. Human-shark interactions are relatively rare events in New York, however, all beachgoers should follow DEC's shark safety guidance to minimize their risk of negative interactions with sharks."
What sharks do have in common is the role they play in their ecosystems. Most sharks are apex predators and sit at the top of the food chain. They play a vital role in keeping the ecosystem healthy by feeding on animals that are lower in the food chain.
While the majority of shark species have sustainable populations, a number of them have been shrinking at an alarming rate. For these species, overfishing, bycatch, and shark finning are contributing factors in their decline.
Candidates for the Bachelor of Arts in Dance are required to attend Shark Preview Weekend in order to audition for course-level placement. If you are interested in completing your dance major placement audition, please email the Shark Preview team at sharkp...@nova.edu with your preferred Shark Preview Weekend audition date. If an in-person audition is not possible, students may request an online audition where they send in a video and schedule an online interview by emailing Elana Lanczi at lan...@nova.edu.
Candidates for the Bachelor of Arts in Art + Design are required to submit a portfolio review and interview during an upcoming Shark Preview Weekend. If you are interested in completing your portfolio review, email the Shark Preview team at sharkp...@nova.edu with your preferred Shark Preview Weekend date. If an in-person portfolio review is not an possible for you, please schedule a virtual review by emailing Kandy G Lopez-Moreno, associate professor of art and design at klo...@nova.edu.
Candidates for the Bachelor of Arts in Music are required to attend Shark Preview Weekend in order to audition. If you are interested in completing your music major placement audition, please email the Shark Preview team at sharkp...@nova.edu with your preferred Shark Preview Weekend audition date. If an in-person audition is not possible, students may request an online audition where they send in a video and schedule an online interview by emailing Dr. Bill Adams at wad...@nova.edu.
The Out to Sea Shark Dive takes you under water inside a metal cage to come face-to-fin with sand tiger sharks, brown sharks, and Atlantic goliath groupers. Our state-of-the-art air helmets allow you to comfortably submerge underwater without diver certification.
Sharks are often considered apex predators at the top of an ecosystem's food web, like Shark Alley's sandbar and sand tiger sharks, which have very few predators as adults. Many other shark species occupy the middle levels of food webs where they feed on smaller fishes and can fall prey to larger or older sharks themselves. Regardless of where in the food web they are, sharks and rays directly control a prey species' population by hunting.
They have indirect impacts, too, as their presence in a habitat can keep other animals away. Depending on which species steer clear of a shark's territory, there can be far-reaching effects, like seagrass beds flourishing in the absence of grazing fish. It is vital that humans recognize the subtle ways these cartilaginous fishes affect their habitats, especially since an estimated third of shark and ray species are threatened due to overfishing.
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