How do I report turtle activity or turtles in trouble?
How many different types of sea turtle are there?
When do sea turtles start to breed?
When do sea turtles nest in Barbados?
How is the nest chamber created?
How long do the eggs incubate?
How do the hatchlings get out of the sand?
How do the hatchlings make it to the sea?
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How do I report turtle activity or turtles in trouble?
Call the Turtle Hotline: 230-0142
How many different types of sea turtle are there?
There are seven different species of sea turtles globally, each of which has a scientific name and a common name. The common name is often a description of some characteristic of the turtle's body. For example, the four most common species in the eastern Caribbean are:
- The green turtle (Chelonia mydas): named for the green colour of its body fat.
- The hawksbill turtle (Eretmochelys imbricata): named because of its narrow head and large beak that resembles the beak of a hawk.
- The leatherback turtle (Dermochelys coriacea): this is the only sea turtle without a bony shell. Its back is covered with a layer of tough, rubbery skin that resembles leather.
- The loggerhead turtle (Caretta caretta): this turtle has an exceptionally large head.
The other three species are the olive ridley turtle (Lepidochelys olivacea), the Kemp’s ridley turtle (Lepidochelys kempii) and the flatback turtle (Natator depressus).
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Hatchlings eat plankton, organic matter, and algae, which float on or near the surface of the ocean. Juvenile and adult hawksbills feed off of the reef systems. They primarily eat a variety of sponges. Juvenile and adult green turtles feed on sea grass and algae. Very little is known about juvenile leatherbacks, |
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When do sea turtles start to breed?
It is thought that female hawksbills in the Caribbean do not start to breed until they are approximately 25-30 years old and adult male hawksbill turtles begin to mate a bit earlier, between 20-25 years. Green turtles are believed to begin breeding at approximately 26-31 years old, while leatherbacks begin mating much earlier than other species, between 9-15 years.
There are no visible external differences between males and females until they reach adulthood. The tail and the size of claws are the only discriminating features between adult male sea turtles and adult females. All juveniles, male or female, have a short tail (a tail that is shorter than, or even with the end of its shell) and short claws that are just visible at the leading edge of the front and hind flippers. However, as the male reaches adulthood, his tail will grow so that it extends well past the end of the shell, and his claws become long and hooked. Adult females, like juvenile sea turtles, have a short tail, and small claws.
When do sea turtles nest in Barbados?
Most hawksbill turtles in Barbados nest during the peak season between mid-May through mid to late October. However, nesting has been documented in every month of the year.
The nesting season for leatherback turtles in Barbados is between February and July.
The first record of green turtles nesting in Barbados was in 2005. It is currently believed that their nesting season is the same as that for hawksbills.
Hawksbill: 75-100 centimetres or 30-39 inches.
Green: 80-125 centimetres or 32-48 inches.
Leatherback: 132-180 centimetres or 52-71 inches.
Hawksbill: 150-220 pounds or 68-100 kilograms.
Green: 144-507 pounds or 65-230 kilograms.
Leatherback: 550-2000 pounds or 250-907 kilograms.
How is the nest chamber created? The female begins the nesting process by using her front and rear flippers to throw away the dry sand around her. She forms a shallow pit around her to prevent the dry sand from constantly filling up the nest cavity that she is trying to dig. Once she has created a 'body pit' she then uses her rear flippers to excavate a nest cavity. She alternates between her right rear and left rear flippers to scoop sand from the nesting chamber. This sand is brought to the surface and is thrown to the side of the nest. She will dig until her rear flippers can no longer reach the deepest portion of the nest. Digging may be abandoned at times due to solid objects such as roots and rocks that prevent her from digging or expanding the nest cavity, as well as movement and/or light disturbances which may scare her back to the sea. |
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The female hawksbill digs a nest chamber in the sand which is approximately 45 centimetres or 18 inches deep.
The female green digs a nest chamber in the sand which is approximately 80 centimetres or 31 inches deep.
The female leatherback digs a nest chamber in the sand which is approximately 100 centimetres or 39 inches deep.
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A female hawksbill turtle lays an average of 4 clutches of eggs each breeding season. Each clutch of eggs contains an average of 150 eggs. A female green turtle lays an average of 4 clutches of eggs each breeding season. Each clutch of eggs contains an average of 110 eggs. A female leatherback turtle lays an average of 7 clutches of eggs each breeding season. Each clutch of eggs contains an average of 85 eggs. These turtles do not breed every year, rather every 2-4 years. |
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How long do the eggs incubate?
Dependent on sand temperature, the eggs will incubate in the sand for 55-75 days, with an average of 60 days incubation period.
How do the hatchlings get out of the sand?
In most cases, all the turtle eggs hatch at the same time. All the hatchlings instinctively know to crawl upwards. With the help of all 100-150 of the scrambling hatchlings, they slowly make their way up to the surface. It takes between 2-4 days for the hatchlings to emerge from the sand. They gauge their emergence on a cooling sand temperature, which usually indicates nightfall.
How do the hatchlings make it to the sea?
When the hatchlings emerge from the sand, they look for the brightest horizon. Naturally, this horizon should ALWAYS be the seaward horizon, with or without a moon. In cases where there are brighter lights inland, the hatchlings will orient themselves toward these lights, rather than the seaward horizon, and will travel inland. Here they succumb to predators such as crabs, are run over on roads, or die from dehydration.
Once the hatchlings make it to the sea, they will begin a 'swimming frenzy' where they swim frantically for approximately 72 hours. They will be picked up and carried by the major currents of the North Atlantic. It is thought that they float on the surface of the ocean for the next 3-4 years, hiding in floating seaweed and travelling wherever the currents take them, before returning to near-shore waters.
Sea turtles may live for 60+ years. Currently, there is no method to accurately age adult turtles.
How is the sex of a sea turtle determined?
Studies have determined that the sand temperature during incubation determines the sex of the sea turtle. Warmer temperatures will result in a greater proportion of female hatchlings, where as cooler temperatures will produce a larger number of male hatchlings.
Sea turtles migrate using the earth's magnetic field. As a hatchling, the turtle imprints on the location where it was born. Although the hawksbill turtles spend the next 20-30 years away from their natal beach, when sexually mature, they are able to migrate back to that site, and if it is a female, they will most likely nest within a short distance of where they themselves were born 30 years earlier.
As of 1998, the Government of Barbados enacted a total moratorium on sea turtle harvesting. It is completely illegal to catch any species of sea turtle, or possess any turtle product (i.e. meat, shell, eggs) in Barbados. Penalties include fines up to $50,000 Barbados dollars and/or two years in jail. However, each country has its own laws, and in some places it is still legal to harvest sea turtles during certain times of the year.
Why are sea turtles threatened?
Hawksbill and leatherback sea turtles are critically endangered, while green turtles are endangered. This is primarily due to over-harvesting by man for the shell, meat and eggs. Tortoiseshell jewellery is made from the hawksbill shell, while canned turtle soup was once made using green turtle meat. Over the last century, sea turtle populations have significantly declined due to over-exploitation. Population recovery is an extremely slow process. It is estimated that only 1 in every 1,000 hatchlings will survive to adulthood, which is not reached until 25-30 years of age. It is only then that turtles can begin to reproduce. A large number of turtles are also accidentally caught and drowned in fishing nets and in long-line fishing gear. Nesting beaches are also under threat. Beachfront developments, including sea walls, buildings, and boulders, limit the spaces available for nesting females to deposit their eggs. This forces the turtles to nest in sub-optimal areas of the beach where entire clutches may be washed away by high tides. Introduced animals such as mongooses, domestic dogs and cats also can dig into nests, eating eggs or hatchlings.
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