Species of large sea reptile
"Chelonia" redirects here. For the synonym of the order Testudines, see
Turtle .
Green sea turtle
A green sea turtle swimming above a Hawaiian coral reef
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Reptilia
Order:
Testudines
Suborder:
Cryptodira
Superfamily:
Chelonioidea
Family:
Cheloniidae
Subfamily:
Cheloniinae
Genus:
Chelonia Brongniart , 1800
Species:
C. mydas
Binomial name
Chelonia mydas
Synonyms [3]
Testudo mydas Linnaeus, 1758
Testudo macropus Walbaum , 1782 (nomen illegitimum )
Testudo viridis Schneider , 1783
Testudo japonica Thunberg , 1787
Testudo marina vulgaris Lacépède , 1788
Testudo viridisquamosa Lacépède, 1788
Testudo mydas macropus Suckow , 1798
Chelonia mydas — Brongniart , 1800
Testudo chloronotos Bechstein , 1800
Testudo cepediana Daudin , 1801
Testudo rugosa Daudin, 1801
Chelone mydas — Brongniart, 1805
Chelonia japonica — Schweigger , 1812
Chelonia virgata Schweigger, 1812
Caretta cepedii Merrem , 1820
Caretta esculenta Merrem, 1820
Caretta thunbergii Merrem, 1820
Caretta mydas — Fitzinger , 1826
Caretta virgata — Fitzinger, 1826
Chelonia lachrymata Cuvier , 1829
Chelonia maculosa Cuvier, 1829
Chelonia midas [sic] ex errore
)
Chelonia mydas var. japonica — Gray , 1831
Chelonia esculenta — Wiegmann & Ruthe , 1832
Chelonia bicarinata Lesson
, 1834
Chelonia marmorata A.M.C. Duméril & Bibron , 1835
Chelonia (Chelonia ) cepedeana [sic] Fitzinger, 1835 (ex errore )
Chelonia viridis — Temminck & Schlegel , 1835
Mydas mydas — Cocteau
, 1838
Mydasea mydas — Gervais , 1843
Euchelonia mydas — Tschudi , 1846
Megemys mydas — Gistel , 1848
Chelonia lacrymata [sic] Agassiz, 1857 (ex errore )
Chelonia formosa Girard , 1858
Chelonia tenuis Girard, 1858
Euchelys macropus — Girard, 1858
Chelone macropus — Strauch , 1862
Chelone maculosa — Strauch, 1862
Chelone marmorata — Strauch, 1862
Chelone virgata — Strauch, 1862
Chelone viridis — Strauch, 1862
Chelonia albiventer Nardo , 1864
Thalassiochelys albiventer — Günther , 1865
Chelonia agassizii Bocourt , 1868
Mydas viridis — Gray, 1870
Chelone midas — Cope , 1871
Chelonia lata Philippi , 1887
Chelone mydas — Boulenger , 1889
Chelonia mydas mydas — Mertens & L. Müller , 1928
Caretta thunbergi [sic] H.M. Smith , 1931 (ex errore )
Chelonia mydas agassizii — Carr , 1952
Chelonia mydas agassizi [sic] Schmidt , 1953 (ex errore )
Chelonia mydas carrinegra Caldwell , 1962
Chelonia agazisii [sic] Tamayo , 1962 (ex errore )
Testudo nigrita Tamayo, 1962
Chelonia agassizi — Carr, 1967
Chelonia mydus [sic] Nutaphand , 1979 (ex errore )
Chelonia mydas carinegra [sic] Nutaphand, 1979 (ex errore )
Testudo chloronotus [sic] H.M. Smith & R.B. Smith , 1980 (ex errore )
Chelone albiventer — Márquez, 1990
Caretta thumbergii [sic] Sharma , 1998 (ex errore )
Chelonia mydas viridis — Karl & Bowen , 1999
The green sea turtle (Chelonia mydas ), also known as the green turtle , black (sea) turtle or Pacific green turtle , not to the color of its carapace, which is olive to black.
The
dorsoventrally flattened body of
C. mydas is covered by a large, teardrop-shaped carapace; it has a pair of large,
paddle -like
flippers . It is usually lightly colored, although in the eastern Pacific populations, parts of the carapace can be almost black. Unlike other members of its family, such as the
hawksbill sea turtle ,
C. mydas is mostly
herbivorous . The adults usually inhabit shallow
lagoons , feeding mostly on various species of
seagrasses .
[9] The turtles bite off the tips of the blades of seagrass, which keeps the grass healthy.
Like other sea turtles, green sea turtles migrate long distances between feeding grounds and hatching beaches. Many islands worldwide are known as Turtle Island due to green sea turtles nesting on their beaches. Females crawl out on beaches, dig nests, and lay eggs during the night. Later, hatchlings emerge, and scramble into the water. Those that reach maturity may live to 90 years in the wild.[6]
C. mydas is listed as
habitat loss
by eliminating nesting beaches.
Taxonomy
The green sea turtle is a member of the
Natator (flatback) was further removed from the other genera than previously believed.
[12]
The species was originally described by
junior synonym
of
C. mydas .
The species' common name does not derive from any particular green external coloration of the turtle. Its name comes from the greenish color of the turtles' fat, which is only found in a layer between their inner organs and their shell.[21] As a species found worldwide, the green turtle has many local names. In the Hawaiian language it is called honu ,[22] [23] and it is locally known as a symbol of good luck and longevity.[24]
Green sea turtle swimming over the sand plateau at playa Grandi,
Curaçao
Female returning to the sea after nesting in
Redang Island ,
Malaysia
Immature
Hawaiian C. mydas
Swimming in a
Mexican coral reef
Heading for the ocean on a beach at the
Pu'uhonua o Honaunau National Historical Park
Green sea turtle near
Marsa Alam ,
Egypt
Green sea turtle near
Marsa Alam ,
Egypt
Green sea turtle
Coming up for a breath
A green sea turtle at
Key West , US
Description
plastron
Taxidermied shell of Chelonia mydas
Its appearance is that of a typical sea turtle . C. mydas has a dorsoventrally flattened body, a beaked head at the end of a short neck, and paddle-like arms well-adapted for swimming.[25] Adult green turtles grow to 1.5 metres (5 ft) long.[26] The average weight of mature individuals is 68–190 kg (150–419 lb) and the average carapace length is 78–112 cm (31–44 in).[27] They are considerd the second largest sea turtle in the United States, with Leatherback Sea Turtle being the largest.[28]
Exceptional specimens can weigh 315 kg (694 lb) or even more, with the largest known C. mydas having weighed 395 kg (871 lb) and measured 153 cm (60 in) in carapace length.[29]
Anatomically, a few characteristics distinguish the green turtle from the other members of its family. Unlike its close relative the
plastron and its shell. Mature
C. mydas front appendages have only a single claw (as opposed to the hawksbill two), although a second claw is sometimes prominent in young specimens.
[31]
The carapace of the turtle has various color patterns that change over time. Hatchlings of Chelonia mydas , like those of other marine turtles, have mostly black carapaces and light-colored plastrons. Carapaces of juveniles turn dark brown to olive, while those of mature adults are either entirely brown, spotted or marbled with variegated rays. Underneath, the turtle's plastron is hued yellow. C. mydas limbs are dark-colored and lined with yellow, and are usually marked with a large dark brown spot in the center of each appendage.[6] [32]
Distribution
Green sea turtle nesting populations (contradicted in article)
The
subpopulations are the Atlantic and the eastern Pacific subpopulations. Each population is genetically distinct, with its own set of nesting and feeding grounds within the population's known range.
[6] One of the genetic differences between the two subpopulations is the type of mitochondrial DNA found in individual's cells. Individuals from rookeries in the Atlantic Ocean and Mediterranean Sea have a similar type of mitochondrial DNA, and individuals from the Pacific and Indian Oceans have another type of mitochondrial DNA.
[33] Their native range includes tropical to subtropical waters along continental coasts and islands between 30°N and 30°S. Since green sea turtles are a migrating species, their global distribution spans into the open ocean. The differences in mitochondrial DNA more than likely stems from the populations being isolated from each other by the southern tips of both South America and Africa with no warm waters for the green sea turtles to migrate through. The green sea turtle is estimated to inhabit coastal areas of more than 140 countries, with nesting sites in over 80 countries worldwide throughout the year. In the United States Atlantic coast, green sea turtles can be found from Texas and north to Massachusetts. In the United States Pacific coast, they have been found from southern California north to the southernmost tip of Alaska. The largest populations of green sea turtles within the United States coastline are in the Hawaiian Islands and
Florida . Globally, the largest populations of sea turtles are in the
Great Barrier Reef in Australia, and the
Caribbean Sea .
[34]
Atlantic subpopulation
The green sea turtle can generally be found throughout the
North Atlantic
islands.
In the Caribbean, major nesting sites have been identified on
Notable locations in South America include secluded beaches in Suriname and French Guiana .[39] In the Southern Atlantic Ocean, the most notable nesting grounds for Chelonia mydas are found on the island of Ascension ,[25] hosts 6,000–13,000 turtle nests.[40] [41] [42]
Indo-Pacific subpopulation
About to break the surface for air at Kona , Hawaii
In the Pacific , its range reaches as far north as the southern coast of Alaska and as far south as Chile in the east. The turtle's distribution in the western Pacific reaches north to Japan and southern parts of Russia 's Pacific coast, and as far south as the northern tip of New Zealand and a few islands south of Tasmania . Significant nesting grounds are scattered throughout the entire Pacific region, including Mexico , the Hawaiian Islands , the South Pacific , the northern coast of Australia , and Southeast Asia . Major Indian Ocean nesting colonies include India , Pakistan , Sri Lanka and other coastal countries.[43]
The turtles can also be found throughout the Indian Ocean ; the east coast of the African continent hosts a few nesting grounds, including islands in the waters around Madagascar .[43]
Specific nesting grounds
Nesting grounds are found all along the Mexican coast. These turtles feed in seagrass pastures in the Gulf of California .[44] Green turtles belonging to the distinct Hawaiian subpopulation nest at the protected French Frigate Shoals some 800 kilometers (500 mi) west of the Hawaiian Islands.[23]
In the
In December 2007, fishermen using a
hulbot-hulbot (a type of
fish net) accidentally caught an 80 kg (180 lb), 93 cm (37 in) long and 82 cm (32 in) wide turtle off Barangay Bolong,
Zamboanga City ,
Philippines . December is breeding season near the Bolong beach.
[46]
Off the north-eastern and northern coasts of Australia, the
Major nesting sites are common on either side of the
Galápagos green turtle
Green Sea Turtle Swimming in the Galápagos
The population that has often been known as the Galápagos green turtle have been recorded and observed in the Galápagos as far back as the 17th century by
Galápagos giant tortoises.
[56] Only over the last 30 years have extensive studies been performed covering the behaviors of the Galápagos green turtles. Much of the debate that has surrounded them recently is over the binomial classification of the species.
[57] At one point the name
Chelonia agassizii was applied to this population as a separate species.
[18] Analysis of
mitochondrial and
nuclear DNA of 15 nesting beaches,
[57] however, has demonstrated that there is not only no significant distinction of this population but that it would be paraphyletic to recognise it. As such the species name
Chelonia agassizzii is considered a junior synonym of
Chelonia mydas [57] as such it is considered as a local variant of the populations of the East Pacific waters and those of other nesting areas.
[57]
The morphological distinctiveness of the Galápagos green turtle has given rise to the debate,[18] but evidence of taxonomic distinctiveness is best served using the combination of multiple datasets. The two most notable morphological distinctions are the considerably smaller adult size and the much darker pigmentation of the carapace, plastron, and extremities.[18] Other distinctions are the curving of the carapace above each hind flipper, the more dome-shaped carapace, and the very long tail of adult males.[58]
Three possibilities have arisen from their unique characteristics: agassizii is a separate species from C. mydas , it is a subspecies of green sea turtle, or it is simply a color mutation.[58] These facts have led to the debate over binomial separation however due to the significance of the DNA testing results there have been no distinctions made at this time.[57] At a meeting for sea turtle scientists and their collaborators in 2000, the evidence for the taxonomic position of the Galápagos green turtle was reviewed and a majority among the participants supported treating it as a population or subspecies of the green turtle (instead of a separate species).[59] However, this is possibly a case of political taxonomy. As such the three major international checklists that cover turtles of the world Reptile Database [60] the checklist of Fritz and Havas (2007)[3] and the IUCN Checklist (TTWG 2017)[61] all consider this a junior synonym.
Habitat
Green sea turtles move across three habitat types, depending on their life stage . They lay eggs on beaches. Mature turtles spend most of their time in shallow, coastal waters with lush seagrass beds. Adults frequent inshore bays, lagoons, and shoals with lush seagrass meadows . Entire generations often migrate between one pair of feeding and nesting areas.[25] Green sea turtles, Chelonia mydas , are classified as an aquatic species and are distributed around the globe in warm tropical to subtropical waters. The environmental parameter that limits the distribution of the turtles is ocean temperatures below 7 to 10 degrees Celsius.[62] Within their geographical range, the green sea turtles generally stay near continental and island coastlines. Near the coastlines, the green sea turtles live within shallow bays and protected shores. In these protected shores and bays, the green sea turtle habitats include coral reefs, salt marshes, and nearshore seagrass beds. The coral reefs provide red, brown, and green algae for their diet and give protection from predators and rough storms within the ocean. The salt marshes and seagrass beds contain seaweed and grass vegetation, allowing ample habitat for the sea turtles.[34]
Turtles spend most of their first five years in convergence zones within the bare open ocean that surround them.pelagic waters.
[64] [65] Green sea turtles typically swim at 2.5–3 km/h (1.6–1.9 mph).
[66]
Ecology and behavior
Swimming, Hawaii
As one of the first sea turtle species studied, much of what is known of sea turtle ecology comes from studies of green turtles. The ecology of C. mydas changes drastically with each stage of its life history. Newly emerged hatchlings are
herbivorous
grazers.
Diet
Predators and parasites
Only some human beings and the larger
Green sea turtles have a variety of parasites including barnacles , leeches , protozoans , cestodes , and nematodes . Barnacles attach to the carapace, and leeches to the flippers and skin of the turtles, causing damage to the soft tissues and leading to blood loss. Protozoans, cestodes and nematodes lead to many turtle deaths because of the infections in the liver and intestinal tract they cause. The greatest disease threat to the turtle population is fibropapilloma , which produces lethal tumor growth on scales, lungs, stomach, and kidneys. Fibropapilloma is caused by a herpesvirus that is transmitted by leeches such as Ozobranchus branchiatus , a species of leech which feeds almost entirely on green sea turtles.[62] [77]
Life cycle
Hatchling
Green sea turtles migrate long distances between feeding sites and nesting sites; some swim more than 2,600 kilometres (1,600 mi) to reach their spawning grounds. Beaches in Southeast Asia, India, islands in the western Pacific, and Central America are where green sea turtles breed.[7] Mature turtles often return to the exact beach from which they hatched. Females usually mate every two to four years. Males, on the other hand, visit the breeding areas every year, attempting to mate.[78] Mating seasons vary between populations. For most C. mydas in the Caribbean , mating season is from June to September.[25] The French Guiana nesting subpopulation nests from March to June.[39] In the tropics, green turtles nest throughout the year, although some subpopulations prefer particular times of the year. In Pakistan , Indian Ocean turtles nest year-round, but prefer the months of July to December.[53]
Returning tracks from a female green sea turtle that had nested on Ilha do Fogo, Mozambique
Sea turtles return to the beaches on which they were born to lay their own eggs. The reason for returning to native beaches may be that it guarantees the turtles an environment that has the necessary components for their nesting to be successful. These include a sandy beach, easy access for the hatchlings to get to the ocean, the right incubation temperatures, and low probability of predators that may feed on their eggs. Over time these turtles have evolved these tendencies to return to an area that has provided reproductive success for many generations. Their ability to return to their birthplace is known as natal homing .[79] The males also return to their birthplaces in order to mate. These males that return to their homes know they will be able to find mates because the females born there also return to breed. By doing this, the green sea turtles are able to improve their reproductive success and is why they are willing to expend the energy to travel thousands of miles across the ocean in order to reproduce.
Mating behaviour is similar to other marine turtles. Female turtles control the process. A few populations practice polyandry , although this does not seem to benefit hatchlings.[80] After mating in the water, the female moves above the beach's high tide line, where she digs a hole 28–56 centimetres (11–22 in) in depth with her hind flippers and deposits her eggs. The hole is then covered up again.[81] Clutch size ranges between 85 and 200, depending on the age of the female. This process takes about an hour to an hour and a half. After the nest is completely covered, she returns to the sea. The female will do this 3 to 5 times in one season.[7]
The eggs are round and white, and about 45 mm (1.8 in) in diameter. The hatchlings remain buried for days until they all emerge together at night.[81] The temperature of the nest determines the sex of the turtles at around the 20–40 day mark. Green Sea Turtles are type 1a, meaning males develop at cooler temperatures while females are produced under hot temperatures.[82] [83] At around 50 to 70 days,[84] the eggs hatch during the night, and the hatchlings instinctively head directly into the water. This is the most dangerous time in a turtle's life. As they walk, predators, such as gulls and crabs , feed on them. A significant percentage never make it to the ocean. Little is known of the initial life history of newly hatched sea turtles.[25] Juveniles spend three to five years in the open ocean before they settle as still-immature juveniles into their permanent shallow-water lifestyle.[64] [65] It is speculated that they take twenty to fifty years to reach sexual maturity . Individuals live up to eighty years in the wild.[6] It is estimated that only 1% of hatchlings reach sexual maturity.
Each year on
South Atlantic,
C. mydas females create 6,000 to 25,000 nests. They are among the largest green turtles in the world; many are more than 1 metre (3 ft 3 in) in length and weigh up to 300 kilograms (660 lb).
[85]
Breathing and sleep
Sea turtles spend almost all their lives submerged, but must breathe air for the oxygen needed to meet the demands of vigorous activity. With a single explosive exhalation and rapid inhalation, sea turtles can quickly replace the air in their lungs. The lungs permit a rapid exchange of oxygen and prevent gases from being trapped during deep dives. Sea turtle blood can deliver oxygen efficiently to body tissues even at the pressures encountered during diving. During routine activity, green and loggerhead turtles dive for about four to five minutes, and surface to breathe for one to three seconds.
Turtles can rest or sleep underwater for several hours at a time, but submergence time is much shorter while diving for food or to escape predators. Breath-holding ability is affected by activity and stress, which is why turtles quickly drown in shrimp trawlers and other fishing gear.[31] During the night while sleeping and to protect themselves from potential predators, the adults wedge themselves under rocks below the surface and under ledges in reefs and coastal rocks. Many green sea turtles have been observed in returning to the same sleeping location night after night.[34]
Physiology and sensory modalities
Green sea turtles tend to have good vision, well adapted to a life at sea. The turtles can see many colors, but are most sensitive to light from violet to yellow or wavelengths of 400 to 600 nanometers. They do not see many colors in the orange to red portion of the light spectrum. On land, however, the sea turtles are nearsighted because the lenses in the eyes are spherical and adjusted to refraction underwater.[34] Sea turtles have no external ear and only one ear bone, called the columella. With one ear bone, the turtles can hear only low frequency sounds, from 200 to 700 Hz. Sounds can also be detected through vibrations of the head, backbone, and shell. The nose of the turtle has two external openings and connects to the roof of the mouth through internal openings. The lower surface of the nasal passage has two sets of sensory cells called the Jacobson's organ. The turtle can use this organ to smell by pumping water in and out of its nose.[62]
Since green sea turtles migrate long distances during breeding seasons, they have special adaptive systems in order to navigate. In the open ocean, the turtles navigate using wave directions, sun light, and temperatures. The sea turtles also contain an internal magnetic compass. They can detect magnetic information by using magnetic forces acting on the magnetic crystals in their brains. Through these crystals, they can sense the intensity of Earth's magnetic field and are able to make their way back to their nesting grounds or preferred feeding grounds.[62]
Natal homing is an animal's ability to return to its birthplace in order to reproduce. Natal homing is found in all species of sea turtles and in other animals such as salmon. How these turtles are able to return to their birthplace is an interesting phenomenon. Many researchers believe that sea turtles use a process called imprinting, which is a special type of learning that occurs when turtles first hatch that allows them to recognize their native beach. There are two types of imprinting that are thought to be the reason turtles can find these beaches. The first is the chemical imprinting hypothesis. This hypothesis states that much like salmon, sea turtles are able to use olfactory cues and senses to smell their way home. However, a problem with this hypothesis is that some turtles travel thousands of miles to return to their native beaches, and the scents from that area are not likely to travel and be distinguishable from that distance.
The second hypothesis is the geomagnetic. This hypothesis states that as it hatches, a young turtle will imprint on the magnetic field of the beach they are born on. This hypothesis strongly correlates to the method which sea turtles use to navigate the earth.[79]
In order to tolerate the constant heat loss in the water, sea turtles have the ability to shunt blood away from tissues that are tolerant of low oxygen levels toward the heart, brain, and central nervous system. Other mechanisms include basking on warm beaches and producing heat through their activity and movements of their muscles. Basking turtles sometimes look like they are crying because behind the turtles eye is the lachrymal gland which stores excess salt from the sea water, which then expels through the turtles eye. In the winter months, turtles living at higher latitudes can hibernate for a short period in the mud.[86]
Unique characteristics and features
Green sea turtles can reach up to 40 miles per hour when swimming, making them the fastest sea turtle.[87] The green sea turtles exhibit sex differences by their development and appearance. As adult turtles, males are easily distinguishable from the females by having a longer tail (visibly extending past the shell) and longer claws on the front flippers. The hatching time and sex of the turtles are determined by the incubation temperature of the nest. Hatchings occur more quickly in nests that are warmer than nests that are in cooler conditions. Warm nesting sites above 30 degrees Celsius favor the development of females, whereas nesting sites below 30 degrees Celsius produce males. The position of the egg in the nest also affects sex-determination. Eggs in the center tend to hatch as females due to the warmer conditions within the nest.[34]
Green sea turtles play an essential role in the ecosystem in which they live. In the seagrass beds, the turtles feed on the seagrass by trimming only the top and leaving the roots of the plant. Through their feeding technique, the turtles help to improve the health and growth of the seagrass beds. The healthy seagrass beds that the turtles provide give habitat and feeding grounds for many species of fish and crustaceans. On the nesting beaches, the green sea turtles provide key nutrients for the ecosystem through their hatched egg shells. In their coral reef habitat, the green sea turtles have a symbiotic interaction with reef fish, including the yellow tang. The yellow tang fish swims along with the turtle and feeds on the algae, barnacles, and parasites on its shell and flippers. This species interaction provides food for the yellow tang and provides a necessary cleaning and smoothing of the turtle's shell. This cleaning helps the turtles swim by reducing the amount of drag and improves their health.[62]
Importance to humans
Key West
, Florida
Historically, the turtles' skin was
calipee, are sought as ingredients for making
turtle soup , a popular 19th-century English and American dish.
[89] [90] [21]
In
Muslims
.
Commercial farms, such as the
Cayman Turtle Farm in the
West Indies , once bred them for commercial sale of turtle meat, turtle oil (rendered from the fat), turtle shell, and turtle leather made from the skin. The farm's initial stock was in large part from "doomed" eggs removed from nests threatened by erosion, flooding, or in chemically hostile soil.
[93] The farms held as many as 100,000 turtles at any one time. When the international markets were closed by regulations that did not allow even farm-bred turtle products to be exported internationally, the surviving farm became primarily a tourist attraction, supporting 11,000 turtles.
[94] Initially started as Mariculture Ltd., then Cayman Turtle Farm Ltd and subsequently branded Boatswain's Beach, in 2010 the farm's brandname was changed to Cayman Turtle Farm: Island Wildlife Encounter.
[95]
Sea turtles are integral to the history and culture of the Cayman Islands . When the islands were first discovered by Christopher Columbus in 1503, he named them "Las Tortugas" because of the abundance of sea turtles in the waters around the islands.[96] Many of the earliest visitors came to the Cayman Islands to capture the turtles as a source of fresh meat during long voyages. The green turtle is a national symbol displayed as part of the coat of arms of the Cayman Islands , which also forms part of the national flag of the Cayman Islands . The country's currency uses a turtle as the watermark in its banknotes.[97] A stylised sea turtle nicknamed "Sir Turtle" is the mascot of the national airline Cayman Airways [98] and is part of the livery of its aircraft.
A ki'i pōhaku (
Conservation
In a public aquarium
In recent decades , sea turtles have moved from unrestricted exploitation to global protection, with individual countries providing additional protection, although serious threats remain unabated.
All populations are considered "threatened".[100] [101]
Threats
Human action presents both intentional and unintentional threats to the species' survival. Intentional threats include continued
tumor-causing disease,
fibropapillomatosis , is also a problem in some populations. The disease kills a sizeable fraction of those it infects, though some individuals seem to resist the disease.
[23] [104] [105] In addition, at least in the Southwestern Atlantic (Río de la Plata, Uruguay), exotic invasive species such as the rapa whelk
Rapana venosa , were reported massively bio-fouling immature green turtles, reducing buoyancy, increasing drag, and causing severe injuries to the carapace.
[106] Because of these threats, many populations are in a vulnerable state.
A poached green turtle in Costa Rica
Pacific green turtles' foraging habitats are poorly understood and mostly unknown.[107] These foraging grounds are most likely along the coast of Baja California, Mexico and southern California,[108] in which these turtles have a high risk of incidental capture by coastal fisheries. The main mortality factor for these turtles is the shrimp trawlers in Mexico, in which many of these turtles go undocumented.[108] The only foraging area that has been identified is the San Diego Bay, but it is heavily polluted with metals and PCBs.[108] These contaminants have a negative effect on the ocean environment, and have been shown to cause lesions and sometimes mortality.[108] Green turtles also are threatened by entanglement and ingestion of plastic.[108] In San Diego Bay, an adult green turtle was found dead with monofilament netting tightly packed in its esophagus.[108] In addition there are indications that global climate change is affecting the ability of green turtle populations in Australia to produce males due to their temperature-dependent sex determination and the rising temperatures in the northern Great Barrier Reef region.[109] Construction of new thermal power stations can raise local water temperature, which is also said to be a threat.[110]
Green sea turtles are the most commonly traded species along Java's south coast and are sold in the form of whole, stuffed animals or turtle oil, locally known as "minyak bulus".[111]
The geographer James J. Parsons' book titled The Green Turtle and Man played a special role in the conservation movement to save the species from extinction.[112]
Global initiatives
A confiscated musical instrument made from the shell of a green turtle, on display at Narita International Airport .
The
In 2001, Nicholas Mrosovsky filed a delisting petition, claiming some green turtle populations were large, stable and in some cases, increasing. At the time, the species was listed under the strict EN A1abd criteria. The IUCN Standards and Petitions Subcommittee ruled that visual counts of nesting females could not be considered "direct observation" and thus downgraded the species' status to EN A1bd—retaining the turtle's endangered status.[119]
In 2004, the IUCN reclassified C. mydas as endangered under the EN A2bd criteria, which essentially states the wild populations face a high risk of extinction because of several factors. These factors include a probable population reduction of more than 50% over the past decade as estimated from abundance indices and by projecting exploitation levels.[1]
On 3 May 2007, C. mydas was listed on Appendix I of the
Convention on International Trade in Endangered Species (CITES) as a member of the family
Cheloniidae .
[120] The species was originally listed on Appendix II in 1975. The entire family was moved to Appendix I in 1977, with the exception of the
Australian population of
C. mydas . In 1981, the Australian population joined the rest. The Appendix I listing prohibits commercial international trade in the species (including parts and derivatives).
[121] The
Zoological Society of London has listed the reptile as an
EDGE species .
[122]
The
Mediterranean population is listed as critically endangered.
[6] [21] The eastern Pacific, Hawaiian and Southern California subpopulations are designated threatened. Specific Mexican subpopulations are listed as endangered. The Florida population is listed as endangered. The
World Wide Fund for Nature has labeled populations in Pakistan as "rare and declining".
[54]
Since 1999, The
Apollo Beach, Florida. In the first year, The Florida Aquarium Animal Response Team managed the care of 21 sea turtles, initiated new foraging-readiness testing for release candidates in deep-dive tank, and released 14 animals. In 2020, they also initiated a study to better understand how micro-plastics are impacting the sea turtles in their care. In 2016,
Florida enacted extensive protection measures. Florida Statutes (F.A.C. Rule 68E-1) restrict the take, possession, disturbance, mutilation, destruction, selling, transference, molestation, and harassment of marine turtles, nests or eggs. Protection is also afforded to marine turtle habitat. A specific authorization from Commission staff is required to conduct scientific, conservation, or educational activities that directly involve marine turtles in or collected from
Florida , their nests, hatchlings or parts thereof, regardless of applicant's possession of any federal permit.
In the State of Hawaii , specifically on the Island of Hawai'i (Hawaii County), state representative Faye Hanohano , a Native Hawaiian rights activist, pressed for a measure to delist C. mydas from protected status so that Native Hawaiians could legally harvest the turtles and possibly their eggs as well. The bill, HCR14, was largely overlooked by the media since at that point it was only a local issue. While the bill was passed in the United States House of Representatives , the United States Senate's Committee on Energy and Environment refused to hear it, which meant that the bill did not go on to be heard by the Senate.[123]
Country-specific initiatives
Osaka Aquarium
, profile photo of turtle resting on bottom
In addition to management by global entities such as the
, specific countries around the world have undertaken conservation efforts.
The
Hindu religious ceremonies. While conservationists respect the need for turtles in rituals, they wanted a smaller quota.
[124]
Multiple protected areas of the Philippines have significant green sea turtle nesting and feeding sites. The most notable is Turtle Islands Wildlife Sanctuary , an UNESCO tentative site which encompasses an entire municipality and one of Southeast Asia's most important green sea turtle nesting sites.[125] Other notable sites include the UNESCO tentative site of El Nido-Taytay Management Resource Protected Area and the UNESCO World Heritage Site of Tubbataha Reefs Natural Park. The species is protected under Republic Act 9147 or the Wildlife Resources Conservation and Protection Act, while the sites where they live and nest are protected under the National Integrated Protected Areas System Act.[126]
tourists assist in the release of the baby turtles into the sea.
[127]
The Hawaiian subpopulation has made a remarkable comeback and is now one focus of ecotourism and has become something of a state mascot . Students of Hawaii Preparatory Academy on the Big Island have tagged thousands of specimens since the early 1990s.[23]
In the
Biodiversity Action Plan, due to excess harvesting and
marine pollution .
[128] The Pakistani-branch of the
World Wide Fund for Nature has been initiating projects for secure turtle hatching since the 1980s. However, the population has continued to decline.
[9]
In the Atlantic, conservation initiatives have centered around Caribbean nesting sites. The Tortuguero nesting beaches in Costa Rica have been the subject of egg-collection limits since the 1950s. The Tortuguero National Park was formally established in 1976, in part, to protect that region's nesting grounds.[36] On Ascension Island , which contains some of the most important nesting beaches, an active conservation program has been implemented.[129] Karumbé has been monitoring foraging and developmental areas of juvenile green turtles in Uruguay since 1999.[130]
In Mozambique, there are a number of initiatives to protect sea turtles. In the
WWF Mozambique has established a turtle tagging and protection program. The archipelego is a vital nesting area for green turtles, including
Ilha do Fogo where Fire Island Conservation
[131] manage a turtle monitoring programme, and at Celdeira Island, where several nesting females have been tagged.
Cayman Turtle Farm located in Grand Cayman in the northwest Caribbean Sea is the first farm to have achieved the second generation of green sea turtles bred, laid, hatched, and raised in captivity.
[132] Since its beginning in 1968, the farm has released over 31,000 turtles into the wild,
[96] and each year more captive-bred turtles are released into the
Caribbean Sea from beaches around the island of
Grand Cayman .
[133] Captive-bred turtles released from the farm as hatchlings or yearlings with "living tags," have now begun to return to nest on Grand Cayman as adults.
[134] [135] On February 19, 2012 the farm released the first 2nd-generation captive-bred green sea turtle equipped with a Position Tracking Transponder, or PTT
[136] (also known as a satellite tag).
[137] In addition, the farm provides turtle meat products to the local population for whom turtle has been part of the traditional cuisine for centuries. In so doing, the farm curtails the incentive to take turtles from the wild,
[138] which over the years in addition to the Cayman Turtle Farm's release of captive-bred turtles has enabled an increase in the number of turtles sighted in the waters around the island of
Grand Cayman and nesting on its beaches.
[139]
In the Pacific, green sea turtles nest on the motu (
On
As of June 2020[update] , a project called "The Turtle Cooling Project" is being undertaken by scientists from the
global warming on northern green turtle breeding, in particular the effect of producing more male turtles owing to the higher temperatures. They are working in the area around Raine Island,
Heron Island and Moulter Cay.
[142]
Genetics
The genome of Chelonia mydas was sequenced in 2013 to examine the development and evolution of the turtle body plan.[143]
See also
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External links