Sea Turtles: Their Secrets, Migration, and How to Protect Them

Sea turtles have been exploring the oceans for millions of years, playing a crucial role in marine ecosystems. From their impressive life cycle to their long migrations, these reptiles are fascinating due to their resilience and adaptability.

Characteristics of Sea Turtles

Sea turtles are cold-blooded reptiles, meaning they rely on the surrounding temperature to regulate their body heat. Unlike land turtles, their shells are adapted for marine life, with a hydrodynamic design and specialized flippers that allow them to swim long distances in search of food. Their sense of direction is remarkable, allowing them to migrate thousands of kilometers with great accuracy.

The Reproductive Process

Sea turtles hatch from soft, leathery eggs that are laid by females in the sand of nesting beaches. The temperature of the sand greatly influences the sex of the hatchlings, with cooler temperatures producing males and warmer temperatures resulting in females.

When the hatchlings are ready to emerge, they work together to leave the nest and instinctively head toward the ocean, a process that usually occurs at night to avoid predators and when the sand is cooler. However, many still fail to reach the water due to natural predators like birds and crabs, and human interference, such as artificial lighting that disorients them.

Taxonomy of Sea Turtles

Sea turtles belong to the Class Sauropsida, the Order Testudines, and the Superfamily Chelonioidea. There are currently seven recognized species distributed in two families:

Family Dermochelyidae: Contains only one species, the leatherback turtle (Dermochelys coriacea), which is distinguished by its flexible shell and large size.
Family Cheloniidae: Includes the other six species, characterized by hard shells and a variety of feeding habits.

The Seven Species of Sea Turtles

Sea turtles inhabit various oceanic habitats and show specific adaptations depending on the species:

Leatherback Turtle (Dermochelys coriacea): The largest of all, with a flexible shell and a diet mainly consisting of jellyfish. It can migrate extremely long distances and endure colder temperatures than other species.
Kemp’s Ridley Turtle (Lepidochelys kempii): Small with a rounded shell, it is one of the most endangered due to incidental fishing and the degradation of nesting beaches.
Olive Ridley Turtle (Lepidochelys olivacea): The most abundant, famous for its massive arribadas on beaches. Although its population is large, it still faces threats from illegal hunting and habitat loss.
Green Turtle (Chelonia mydas): Primarily herbivorous with a shell of brown-green tones. It is crucial for maintaining marine ecosystems as it controls the growth of seagrass meadows. They are called “green” because of the color of their fat, which comes from their diet. Some have dark gray shells, known as “black” turtles.
Hawksbill Turtle (Eretmochelys imbricata): Distinguished by its hawk-like beak and thick, overlapping shields, it prefers coral reefs. It is highly exploited for its shell, which has been used by local communities in the manufacture and sale of crafts.
Loggerhead Turtle (Caretta caretta): This species has a relatively large head compared to its body. It is characterized by strong jaws used to feed on hard-shelled invertebrates like crabs and mollusks.
Flatback Turtle (Natator depressus): Its flattened shell gives it its name and is endemic to Australia.

Leatherback turtle (Dermochelys coriacea), the only species in the Dermochelyidae family, during a patrol with Turtle Love researchers at Playa Tres, Limón, Costa Rica. Image taken by ECO.360. Photograph taken under scientific research permits.

Migration

From the moment they hatch, sea turtles embark on an amazing journey. Males generally do not return to the coast, while females do return to the region where they were born to complete their nesting rituals. Migration routes vary by species. Knowledge of these routes comes from technologies like satellite transmitters and genetic studies that track their movements and understand their migratory patterns. Thanks to satellite transmitters attached to their shells, scientists can monitor their movements in real-time, identify key feeding and breeding areas, and assess the effects of climate change on their routes. Additionally, genetic studies allow scientists to analyze the DNA of turtles to understand their origins and global population connections.

Every day, information about these routes continues to be learned and updated, which is essential for conservation. With this data, marine protected areas can be established, fishing activities can be regulated to reduce bycatch, and more effective strategies for protecting these endangered species can be designed.

Threats and How to Protect Them

Sea turtles face numerous dangers, such as solid waste pollution, incidental fishing, and climate change. Some actions that can be taken to protect them include:

Reducing plastic use to prevent it from reaching the ocean and affecting marine species.
Participating in conservation programs and volunteering, helping with data collection in sea turtle monitoring and other species.
Supporting responsible tourism by choosing wildlife-friendly activities.
Respecting nesting beaches by avoiding the installation of inappropriate artificial lighting and preventing waste on beaches.
Sharing information on social media to raise awareness and promote positive changes to live in harmony with the environment.

Sea turtles are essential to the balance of marine ecosystems. However, their survival largely depends on human actions. Protecting their habitats, reducing pollution, and supporting natural conservation initiatives are key steps in ensuring their future. Every small effort counts, and with education and commitment, make a difference.

Be part of the change with Turtle Love and help conserve these amazing species! ¡Donate here and contribute to their conservation!

References:

https://dialnet.unirioja.es/descarga/articulo/7094694.pdf

https://www.dgcs.unam.mx/boletin/bdboletin/2024_962.html