How Sea Turtles Use Magnetic Plates as GPS to Navigate

Tranquil and majestic, spotting a sea turtle in the tropics is at the top of most travelers’ list. Perhaps it’s because they pose no threat – unlike other aquatic species, such as sharks, snakes, and, in some instances, rays – or it’s because watching them swim is like spotting an eagle glide through the air; they symbolize grace and elegance, with a healthy dose of fascination.

Introduction

Loggerhead sea turtle deep in the ocean. Image by wrangel via Depositphotos.

Often frolicking within turquoise waters, surrounded by vibrant fish, which through the lens of goggles is reminiscent of a kaleidoscope, you’ll find them in most of the world’s radiant reefs, islands, and oceans, from the serene Sumatran coastline to the exuberant Great Barrier Reef.

If you find yourself swimming alongside one, more often than not, it signifies that you’re exploring a beautiful nook of the world; safe to say, judging by their usual living quarters, sea turtles don’t have bad taste.

Where Do They Roam?

It would be wrong to claim they always live in the same proximity. When born, before embarking on a challenging and noble pilgrimage, they endure what many believe to be their most dangerous yet shortest test – going from their freshly hatched shell to the ocean.

Migrants

Green sea turtle moving out of the water. Image via Depositphotos

A treacherous and vulnerable migration, it’s a renowned feeding frenzy for multiple predators, meaning only a few make it into the deep blue, but once they do, similarly to whales, which are hundreds of times their size, sea turtles go-on to cover expansive distances, travelling thousands of kilometres and reaching several oceans and continents in their lifetime, showcasing resilience and determination. When it’s time to breed, they usually return to where life began. And that’s where the magnetic plates come into play.

How Do Sea Turtles Use Magnetic Plates?

Remarkably and unbeknown to scientists until now, a recent study headed by University of North Carolina professor Kenneth Lohmann suggests that sea turtles, through identifying the magnetic field’s intensity and its inclination angle, utilize magnetic plates to navigate back home, with most sea turtles beaching about 40 to 50 miles from where they hatched – often decades later and after traveling from the other side of the world.

This phenomenal instinct, which Lohmann suggests several birds and fish like salmon have been utilizing for centuries, is referred to as magnetoreception – a natural GPS that taps into the movements of tectonic plates.

The Different Types of Sea Turtles and Their Migratory Routes

Sea turtles are known for their impressive long-distance migrations, and the distances they travel can vary depending on species, age, and life stage. Here are some general insights into the migratory behaviors of different sea turtle species:

Loggerhead Turtles

Loggerhead sea turtle in the ocean. Image by wrangel via Depositphotos.

Loggerhead turtles are known to undertake long migrations across ocean basins. They have been recorded traveling thousands of miles between nesting and feeding areas. Some loggerhead turtles tagged in the United States have been found to travel to the Mediterranean Sea and vice versa.

Green Turtles

sea turtle — Green Sea Turtle. Image via Depositphotos

Green turtles are known to migrate long distances between their feeding and nesting grounds. For example, green turtles that nest in Ascension Island in the South Atlantic have been tracked traveling to feeding areas off the coast of Brazil.

Leatherback Turtles

leatherback sea turtle — Leatherback sea turtle. Image by Jakob Owens via Unsplash

Leatherback turtles are the largest of all sea turtles and highly migratory. They can travel vast distances and are known to cross entire ocean basins. Some leatherback turtles tagged in the Pacific have been recorded traveling to the Atlantic Ocean.

Hawksbill Turtles

Hawksbill sea turtle dive swim in the deep blue ocean. Image via Depositphotos

Hawksbill turtles also undertake significant migrations, moving between nesting and feeding areas. Their movements can vary, but they generally cover substantial distances.

Kemp’s Ridley Turtles

A large Kemp’s Ridley Sea Turtle – Lepidochelys kempii. Image via Depositphotos

Kemp’s ridley turtles are known for mass nesting events called arribadas. They primarily inhabit the Gulf of Mexico and migrate along the Atlantic coast. They have been found to travel long distance.

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Freddie Hiney

Author at Animals Around The Globe

Freddie is a writer and digital marketing professional with a First-Class Honours degree in Marketing and Journalism. Influenced by his father, an internationally published journalist, and author, Freddie's love for writing is deeply ingrained. He appreciates thought-provoking, clear, raw, and honest writing, always infused with hope.

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