The loggerhead sea turtle, also known as the leatherback sea turtle, is one of the largest sea turtle species in existence. It has a flexible shell and a large head relative to its body, giving it its common name. These turtles inhabit tropical and subtropical waters around the world, primarily found in warm climates. They are known for their ability to dive to great depths and feed on jellyfish, jellyfish, and other gelatinous animals. Furthermore, loggerhead sea turtles are known for undertaking long ocean migrations in search of suitable nesting sites.
Where does the loggerhead turtle live?
The loggerhead sea turtle, also known as the hawksbill sea turtle, is a species of sea turtle found in tropical and subtropical waters around the world. It primarily inhabits the Atlantic, Indian, and Pacific oceans.
These turtles prefer to live in warmer, shallower waters, near coral reefs and estuaries. They are known for making long migrations throughout the year, following ocean currents and seeking warmer waters to breed.
Furthermore, loggerhead turtles are very docile and solitary animals, spending most of their time swimming in search of food. They feed primarily on jellyfish, jellyfish, and small fish.
They are solitary and peaceful animals that spend most of their time swimming in search of food.
Discover the curiosity of the loggerhead turtle and be amazed by its peculiarity.
The loggerhead turtle, also known as the leatherback turtle, is a fascinating species that inhabits tropical and subtropical seas around the world. Its main characteristic is the impressive size of its head in relation to its body, which gives it a unique and curious appearance. Furthermore, it has a flexible and resistant shell, adapted to withstand the pressures of the ocean's depths.
These turtles are known for their migratory behavior, traveling long distances in search of food and breeding grounds. They feed primarily on jellyfish, helping to control the population of these marine organisms. Furthermore, loggerhead turtles are excellent swimmers, reaching impressive speeds during their journeys through the ocean.
An interesting fact about the loggerhead turtle is that it is the largest turtle in the world, reaching over two meters in length and weighing over 900 kilograms. Despite their imposing size, these turtles are docile and harmless, preferring to avoid contact with humans whenever possible.
However, the loggerhead turtle faces several challenges in its natural habitat, including ocean pollution, overfishing, and the destruction of its breeding grounds. Therefore, it is essential that conservation measures be adopted to protect this incredible species and ensure its future survival.
What is the typical behavior of a turtle in its natural environment?
Loggerhead turtles are fascinating animals that primarily inhabit the world's tropical and subtropical waters. These creatures have unique characteristics that distinguish them from other turtle species, such as their large head relative to their body and their remarkable diving ability.
In their natural habitat, loggerhead turtles are known for being agile and graceful swimmers. They spend most of their time in the water, where they feed on crustaceans, mollusks, and other small marine animals. During the day, can be seen swimming in search of food or resting in shallower areas. At noite, prefer to move in deeper waters, where they feel safer from predators.
Another characteristic of loggerhead turtles is their ability to blend in with the marine environment. Their dark shell and elongated head help them blend in with the seaweed and rocks on the seabed, making them less visible to potential predators. This ability to mimic is essential for the survival of these animals in the wild.
Additionally, loggerhead turtles are known to be excellent swimmers, able to travel long distances in search of food or during their seasonal migrations. This ability to resist to great challenges and adapting to different environmental conditions is one of the reasons why these animals have survived for millions of years.
These unique characteristics make them fascinating creatures that deserve to be protected and preserved in their natural habitats.
Turtles' natural environment: where they live and adapt to their habitat.
The loggerhead sea turtle, also known as the leatherback sea turtle, is a species of sea turtle found in various oceans around the world. They are known for their large size and their smooth, flexible shell, which resembles leather. Loggerhead sea turtles are adapted to live in marine environments, where they spend most of their lives.
These turtles are capable of adapting to a variety of marine habitats, from tropical to colder waters. They are found primarily in coastal regions, where they feed on a variety of marine animals, such as jellyfish, algae, and mollusks. Loggerhead turtles are also known for undertaking long migrations around the world, traveling vast distances in search of food and breeding grounds.
Loggerhead turtles are incredible animals, able to adapt to diverse environmental conditions and survive in challenging marine environments. Their ability to move and feed in diverse habitats makes them a unique and fascinating species. It's important to protect these turtles and their natural habitats to ensure their future survival.
Loggerhead turtle: characteristics, habitat and behavior
A turtle big head ( Caretta caretta ) is an oceanic animal that belongs to the Cheloniidae family. This species is one of the largest sea turtles, weighing up to 200 kg. It has a huge head and a very strong and powerful jaw.
Its shell is formed by non-overlapping plates, where the nuchal plate connects to the first dorsal plate. The upper part and head of the loggerhead turtle are orange-yellow or reddish-brown, while the underside is light yellow.
One aspect that sets it apart from other species in its genus is the two claws on each fin. These claws are used to carry food, tear flesh, and help break down the hard exoskeleton of some prey, such as crabs and bivalves.
Caretta caretta It is widely distributed in the Mediterranean Sea and the Pacific, Indian, and Atlantic Oceans. Although the loggerhead turtle can move quickly in marine waters, on land its movement is slow.
Males rarely leave the water, while females do so exclusively to nest and lay eggs.
Features
– Adaptations
Respiratory system
The loggerhead's respiratory system is adapted for deep-sea diving. This animal has lungs, so it needs to emerge from the water to receive oxygen, but it doesn't need to surface frequently.
This species has very unique organic modifications, not found in other sea turtles. For example, they have the ability to adjust their breathing rate.
This allows you to recover faster after diving and makes your oxygen supply more efficient. It also has the ability to store more oxygen because there are more red blood cells in your body.
Salt processing
A Caretta caretta can drink saltwater without becoming dehydrated or causing any kind of organic change. The reason is that they can process seawater, secreting the excess through the salt glands located behind their eyes.
The lacrimal glands help maintain osmotic balance by eliminating excess salt from seawater intake. When this substance is released through the ocular ducts, it appears as if the loggerhead turtle is crying.
Swimming and diving
One of the most notable adaptations of the loggerhead turtle is the modification of its front limbs. These, evolutionarily, became fins, allowing it to swim.
On the other hand, the neck and legs are not retractable. This is a great advantage for fast swimming. Likewise, this species is a deep-sea diver and can do so for up to 20 minutes. Furthermore, when resting, they can go hours without breathing.
This is possible thanks to the rapid gas exchange that occurs in the lungs. Furthermore, blood is redirected from areas with low oxygen demand to vital organs such as the brain, heart, and central nervous system.
Despite the pressure the animal experiences during the dive, oxygen is efficiently supplied to all body tissues. Another factor that helps the loggerhead turtle remain submerged for long periods is its low metabolic rate.
- Size
This species is the second largest in the world, after the leatherback turtle. The female is generally larger than the male, but has a longer tail, which can measure up to 30 centimeters.
As adults, loggerhead turtles can weigh between 80 and 200 kg, measuring between 70 and 115 centimeters. The maximum recorded weight is 545 kg, with a length of 213 centimeters.
- Shell
The shell serves as external protection against predators, although these animals cannot retract their legs or head. The shell is divided into two parts: the back and the plastron, which forms the underside. It is composed of large, non-overlapping scutes or plates.
The nuchal shield is in contact with the first rib cage. The posterior region is delimited by 11 or 12 pairs of plates. In the midline of the back, there are five vertebral shields, delimited by five pairs of rib plates.
The neck shield is located at the base of the head. The connection between the shell and the plastron is made possible by three pairs of inframarginal shields. The lower part pairs the humeral, pectoral, abdominal, anal, gular, and femoral shields.
The male usually has a wider shell than the female, as well as a curved claw on each of its front legs. This structure usually has a large amount of attached epibiota, accounting for over 50 species of invertebrates.
– Coloring
The sides of the body and neck are brown on the upper area and yellow on the sides and underside.
The male is often browner and yellower on the head than the female. The juvenile is reddish brown to dark brown on the shell, with a cream to brown plastron.
– Sexual dimorphism
There are notable differences between males and females, which are evident in adulthood. The male has longer claws, tail, and head than the female. The male's shell is less domed, and the plastron is shorter, likely to accommodate its long tail.
Definition of sex
Like other turtles, in Caretta caretta, Sex determination depends on temperature. Thus, the temperature at which the egg develops during the middle third of the incubation period will influence whether the offspring will be female or male.
The incubation temperature is that at which an equal ratio of males to females can occur.
This can vary depending on the geographic location, although it is generally between 28 and 30 ° C. For example, in South Africa, the core temperature is 29,7 ° C, while in Australia it is 28,2 ° C.
Experts indicate that temperatures between 24 and 26°C generally produce males, and those between 32 and 34°C tend to produce females. Outside these ranges, eggs are not viable.
predators
Predation is one of the most common causes of death for loggerhead embryos. These can be attacked by birds, canines, crabs, or insects.
In Türkiye, the darkling beetle ( Pimelia sp .) It attacks 36% of nests, while in Cyprus, 15% are preyed upon by dipterans Sarcotachina aegyptiaca However, in the first 24 hours of life, 90% of the chicks are consumed by fish, birds, crustaceans and mammals.
Juveniles and adults are preyed upon by killer whales, large sharks, and sperm whales. Thus, in the Mediterranean Sea, the jaquetón ( Carcharodon carcharias ) is a shark that ferociously attacks Caretta caretta . In addition, monk seals ( monachus monachus ) attack loggerhead turtles in areas close to Mediterranean nesting beaches.
Defense strategies
The researchers did not describe any defense strategy for this species, other than the hardness of its shell. However, in neonates, the behavior of associating with vegetation or floating plants stands out, where they tend to hide from the threat of predators.
This defensive behavior is due, among other things, to the fact that the offspring's shell is not fully ossified. Therefore, it is easy for them to be attacked or eaten by a predator.
Another strategy to avoid threats is carried out by the female, who takes more than an hour to cover the nest where she laid her eggs.
To achieve this camouflage, the female's front flippers remove the sand, creating a large area of several square meters around the nest. This makes it difficult to identify the exact location of the eggs visually and olfactorily.
Habitat and distribution
This species spends most of its life in shallow coastal waters and the open ocean. It rarely comes ashore except when the female needs to build her nest and lay eggs.
The waters where it lives have surface temperatures ranging from 13,3°C to 28°C during non-nesting times. When the female is building her nest, the appropriate temperature is between 27°C and 28°C.
In the Atlantic Ocean, loggerhead turtle age is a key factor influencing habitat preference. Thus, juveniles are often located in shallow estuaries with limited access to the ocean. Adults, on the other hand, do not nest in this area.
In this sea turtle's habitat, algae Sargassum play a very important role, as they are home to up to 100 different species of animals that feed Caretta caretta . Prey includes crab larvae, hydrozoan colonies and fish eggs.
The loggerhead sea turtle inhabits the Indian, Atlantic, Pacific, and Mediterranean oceans. Thus, it nests across a wide geographic range, more extensive than any other sea turtle.
Atlantic Ocean
In the Atlantic Ocean, it is highly concentrated in the Gulf of Mexico and the southeastern coast of North America. On the African and European coasts, the population of Caretta caretta is quite low. The loggerhead turtles that inhabit this ocean generally feed from Brazil to Canada.
The nesting area extends north to Virginia and south to Brazil, with the Cape Verde Islands to the east. However, Florida is considered a favorite nesting spot, with a total of over 67.000 nests annually.
The Indian Ocean
In relation to the Indian Ocean, to hunt its prey, the loggerhead turtle travels along the entire African coast, the Arabian Sea and the Arabian Peninsula.
In Africa, this species breeds from the Bazaruto Archipelago (Mozambique) to the St. Lucia Estuary (South Africa). Oman, located on the Arabian Peninsula, is the largest nesting site in the Indian Ocean.
Pacific Ocean
The Pacific loggerhead sea turtle lives in tropical and temperate regions. It feeds in the southwest Pacific, the East China Sea, and the Baja California Peninsula. The most frequent nesting areas are Japan, eastern Australia, and the Great Barrier Reef.
However, the main nesting site is Yakushima Island, which receives up to 40% of loggerhead turtle visits. Populations living in the eastern Pacific are clustered off the coast of Baja California, making it a very favorable feeding area.
Mediterranean Sea
In the Mediterranean Sea, there are almost 45% of the juvenile population that migrated from the Atlantic. The adult typically visits these waters in the summer and spring months. To find their food, Caretta caretta goes to the Adriatic Sea and the Alboran Sea.
As for nesting sites, the most common are Turkey, the coasts of Cyprus and Greece, which, with more than 3.000 nests per year, is the most visited location by this sea turtle.
Danger of extinction
The loggerhead turtle population is declining, which has led the IUCN to classify it as a vulnerable species.
In the United States, the National Marine Fisheries Service and the Fish and Wildlife Service classify the loggerhead sea turtle as a threatened animal under the Endangered Species Act.
– Threats
Bycatch
Juvenile species form groups off the coast of Baja California Sur, Mexico. In these areas, coastal fishing activities increase the risk of death.
Fishermen in the area frequently report accidentally catching this species using longlines, traps, dredges, and gillnets. These traps can cause the animal to become entangled and drown.
Hunting
Previously, this species was hunted for eggs and meat. However, due to legal regulations, its consumption has declined significantly. Despite this, in Mexico, loggerhead turtle eggs are a common dish, attributed to their aphrodisiac effects.
Habitat degradation
The development of the coastal region is a factor that directly affects the natural habitat of Caretta caretta . Thus, the construction of dredges, tourist infrastructure, docks, marinas or urbanizations modifies the environment, bringing serious consequences for nesting and egg laying.
Thus, the construction of tall buildings reduces the amount of sunlight that affects the sand. This lowers the average temperature of the loggerhead turtle egg-laying site, resulting in variations in the sex ratio of the hatchlings.
On the other hand, the artificial lighting used in various infrastructures interferes with settlement and the ability of young to reach the water's edge. Since they hatch at night, the natural process is for light reflected from the sea to guide them to the water.
In this case, they are driven, confused, and disoriented by artificial light, to areas other than the sea, such as populated areas. This exposes the hatchlings to dehydration, causing their death.
Pollution
Every year, tons of plastic are dumped into the ocean, causing loggerhead turtles to ingest some of these items, such as bags and sedans. This has serious consequences for the animal, which can die from suffocation or organic problems.
Similarly, oil spills and chemical waste pollute the water, causing habitat fragmentation and the death of this turtle.
Climate change
Variations in climatic temperatures can affect the sex ratio, as this factor determines whether the fertilized egg will be female or male. Thus, according to studies, in some nesting sites, exposure to high temperatures produced between 87 and 99% female offspring.
– Actions for your protection
Caretta caretta is listed in Appendix I of CITES, so its trade is restricted. Similarly, many countries and various protectionist organizations work to protect the loggerhead turtle.
For example, the Sea Turtle Association in Japan supports sea turtle conservation. Similarly, the Marine Research Foundation works to conserve this species in Oman.
As a result of national and international agreements, some of the threats have been reduced. Among these is the reduction in the collection of eggs and adults in several nesting areas located around the world.
Taxonomy and subspecies
Animal Kingdom.
Subkingdom: Bilateria.
Filum: Cordate.
Subfilter: Vertebrate.
Superclass: Tetrapoda.
Class: Reptilia
Order: Testudines.
Suborder: Cryptodira.
Superfamily: Chelonioidea.
Family: Cheloniidae.
Subfamily: Carettinae.
Genre: Caretta.
Species: Caretta caretta.
Playback
Loggerhead turtles are sexually mature as adults, and their shells measure over 90 centimeters in length. This occurs between approximately 17 and 33 years of age.
Courtship involves various behaviors, including caresses, biting, and fin and head movements. Experts indicate that the female produces pheromones that signal to the male that she is ready to mate.
Before mating, the male approaches the female, attempting to mount her. Initially, he might resist, but then they begin to surround each other. If multiple males attempt to mate, the female moves away, allowing them to fight among themselves.
The victor mates with the female, carrying her off with his curved claws, damaging the couple's shell. Frequently, the other males who failed to mate often bite the male with the female, often damaging his tail and fins.
In most sea turtles, courtship and mating occur near the nest site. In contrast, in loggerhead turtles, mating occurs along the migration route, between the breeding and feeding grounds.
Mating and nesting
Experts indicate that ovulation is induced by mating. Furthermore, the female can store sperm from multiple males in her oviducts until ovulation. For this reason, a litter can have up to seven different fathers.
The nesting process lasts between one and two hours. It usually occurs in open sand areas or near dune grasses, which can be used to camouflage the nest. To lay her eggs, the female leaves the water, climbs onto the beach, and digs into the sand surface, intending to form a pit.
The female digs a chamber in her hind limbs, where she lays between 115 and 125 eggs. After covering them with sand, the mother returns to the sea. On many occasions, the female returns to the same beach where she previously nested.
Incubation lasts between 55 and 65 days, after which the offspring emerge. These can be light brown to black, without the red and yellow hues typical of adults. They weigh about 20 grams and measure 4,6 centimeters.
Food
For most of its life, the loggerhead turtle is carnivorous. Although its feeding behavior is general, as it grows, its diet varies.
Juveniles typically eat sponges, sargassum seaweed, jellyfish, and crustaceans. As juveniles and adults, they feed on clams, snails, horseshoe crabs, sea urchins, and other crustaceans. Occasionally, I might eat carrion.
During its migration to the open sea, it usually hunts floating mollusks, jellyfish, pteropods, flying fish, eggs and floating squid.
Their diet is more extensive than that of other sea turtles, including corals, sponges, polychaete worms, sea feathers, starfish, anemones, and baby turtles, including those of their own species.
We also pack any Caretta caretta can eat algae, such as those belonging to the genus Ulothrix , Ascophyllum e Sargassum . In addition, they feed on some vascular plants. Cymodocea clade , Thalassia e seagrass .
Feeding method
Their powerful jaws allow them to crush the hard exoskeletons of crabs, bivalves, and snails. Their front legs have pseudoclaws that allow them to manipulate food and tear flesh.
Once food is swallowed, mucus-covered papillae found at the front of the esophagus help filter out any foreign matter that has been introduced.
Behavior
migrations
Like the vast majority of sea turtles, loggerheads are migratory. During their lifetime, they use a wide variety of widely separated habitats. When the young leave their nesting beaches, they begin an oceanic phase.
After remaining in the oceans for between 4 and 19 years, they move to areas rich in epileptic and benthic dams, where they feed and grow until they reach maturity (approximately between 10 and 39 years).
Upon reaching sexual maturity, Caretta caretta begins a reproductive migration between foraging and nesting areas. The interval between migrations varies between 2,5 and 3 years.
Communication
In this species, perception is highly developed. By the time the young emerge, they have the ability to analyze their environment. This allows them to determine the direction they should take to reach the ocean. To do this, they rely on the light from the moon reaching the ocean.
When they are in the water, they use magnetic and chemical signals to orient themselves and navigate towards the currents, where they will live the next few years of their lives.
References
- Duermit, L. (2007). Caretta caretta. Animal Diversity Retrieved from animaldiversity.org.
- Wikipedia (2019). The tortoise is a tortoise. Retrieved from en.wikipedia.org.
- Casale, P., Tucker, A.D. (2017). Caretta caretta (amended version of the 2015 assessment). The IUCN Red List of Threatened Species 2017. Retrieved from iucnredlist.org
- Marinebio (2019). Loggerhead sea turtles, Caretta caretta. Retrieved from marinebio.org.
- Lindsay Partymiller (2019). Sea turtle (Caretta caretta). Retrieved from srelherp.uga.edu.
- Lutcavage ME, Lutz PL, Baier H. (1989). Respiratory mechanics of the loggerhead sea turtle Caretta caretta. Retrieved from ncbi.nlm.nih.gov.
- ITIS (2019). Caretta caretta. Retrieved from itis.gov.