This is a vulnerability for the turtles because such beaches easily erode.  A previous contender, the "Harlech turtle", was purportedly 256.5 cm (8.42 ft) in CCL and 916 kg (2,019 lb) in weight, however recent inspection of its remains housed at the National Museum Cardiff have found that its true CCL is closer to 1.5 m (4.9 ft), casting doubt on the accuracy of the claimed weight, as well. Five species of sea turtles are known to reside in Indian coastal waters and islands.  Dermochelys juveniles spend more of their time in tropical waters than do adults. The foundation established a sanctuary in Costa Rica, the Parque Marino Las Baulas.. The leatherback is the largest turtle in the world, and has a primarily black rubbery skin with pinkish-white coloring on its underside. , They are also the fastest-moving non-avian reptiles. Sea turtles, especially the leatherback, keep jellyfish under control, thereby helping to maintain healthy fish stocks in the oceans. The Seri people, from the Mexican state of Sonora, find the leatherback sea turtle culturally significant because it is one of their five main creators.  Due to their obligate feeding nature, leatherbacks help control jellyfish populations. India has 23.39% of … On Florida's Atlantic coast, some beaches with high turtle nesting density have lost thousands of hatchlings due to artificial light. ... Loggerhead Turtle and the Leatherback turtles and except the Loggerhead Turtle other 4 nest along the Indian coast. Find out about sea turtles' oldest known ancestor, how certain adaptations may have helped the reptiles survive, and the conservation efforts being made to save them.  While nesting beaches have been identified in the region, leatherback populations in the Indian Ocean remain generally unassessed and unevaluated. Several species of sea turtles commonly ingest plastic marine debris, and even small quantities of debris can kill sea turtles by obstructing their digestive tracts. It swims around the globe, crossing the Atlantic and Pacific Ocean and travelling as far north as Alaska and Norway and as far south as the most southern point of New Zealand, South America and South Africa. Leatherback Turtles and Oliver Ridley Turtles have been classified as “Vulnerable”. There are seven extant species worldwide, five of which can be found in the Red Sea: the green turtle, the hawksbill turtle, the loggerhead turtle, the olive ridley turtle and the leatherback turtle. The adult leatherback can reach 4 to 8 feet in length and 500 to 2000 pounds in weight. , Relatives of modern leatherback turtles have existed in relatively the same form since the first true sea turtles evolved over 110 million years ago during the Cretaceous period. Once in the ocean, young leatherbacks still face predation from cephalopods, requiem sharks, and various large fish. The leatherback sea turtle, unlike other sea turtles… Biodiversity of India. , Both the turtle's common and scientific names come from the leathery texture and appearance of its carapace (Dermochelys coriacea literally translates to "Leathery Skin-turtle"). At a distance from sustaining fishing grounds, India’s coastal waters and beaches endow with foraging and nesting sites for a variety of marine species, including sea turtles. Many of the same predators feed on baby turtles as they try to get to the ocean, as well as frigatebirds and varied raptors. , Dead leatherbacks that wash ashore are microecosystems while decomposing. Its carapace is large, elongated and flexible with 7 distinct ridges running the length of the animal. These are the Olive Ridley, Green, Hawksbill, Loggerhead and the Leatherback turtles. Red Sea Turtles are turning overwhelmingly female because of a rise in sea temperatures caused due to anthropogenic climate change. After nightfall, the hatchings dig to the surface and walk to the sea. , Recent estimates of global nesting populations are that 26,000 to 43,000 females nest annually, which is a dramatic decline from the 115,000 estimated in 1980. All flippers are without claws. Leatherback sea turtles are the largest turtle species, and the fourth-heaviest reptiles alive today (3 crocodile species are heavier).. Leatherback turtles are between 1.8 and 2.2 m (6 and 7.2 ft.) in length. Accordingly, there are no prescribed management actions for reducing leatherback sea turtle entanglements, nor are there target levels of reductions in takes. This program strives to help save the world's largest turtle from extinction in Matura Beach, Trinidad, as volunteers work side by side with leading scientists and a local conservation group, Nature Seekers. , Domenico Agostino Vandelli named the species first in 1761 as Testudo coriacea after an animal captured at Ostia and donated to the University of Padua by Pope Clement XIII.  The leatherback turtle is scarcely larger than any other sea turtle upon hatching, as they average 61.3 mm (2.41 in) in carapace length and weigh around 46 g (1.6 oz) when freshly hatched. Dermochelys coriacea is the only species in genus Dermochelys. The last official count of nesting leatherback females in Brazil yielded only seven females. Despite their lack of a hard shell, the huge adults face fewer serious predators, though they are occasionally overwhelmed and preyed on by very large marine predators such as killer whales, great white sharks, and tiger sharks. Its distinguishing feature is its carapace, which has a smooth, leathery skin that covers a flexible matrix of bone. The major cause of the decline was egg consumption by humans. , Off the Atlantic coast of Canada, leatherback turtles feed in the Gulf of Saint Lawrence near Quebec and as far north as Newfoundland and Labrador. , They are also a major jellyfish predator, which helps keep populations in check. The Leatherback Turtles are the world’s largest living sea turtles. Sea turtles, especially the leatherback, keep jellyfish under control. UPSC Daily Current Affairs 08-December-2020. This subpopulation, however, has effectively been eradicated. Threats to Turtles While other sea turtle species almost always return to their hatching beach, leatherbacks may choose another beach within the region.  Leatherbacks follow their jellyfish prey throughout the day, resulting in turtles "preferring" deeper water in the daytime, and shallower water at night (when the jellyfish rise up the water column). They choose beaches with soft sand because their softer shells and plastrons are easily damaged by hard rocks. Leatherbacks have a unique, warm-bodied physiology and a different type of carapace than “hard shelled” sea turtles. The turtle order, Testudines (or Chelonia), splits into two suborders, Cryptodira and Pleurodira, and then further splits into 13 families, 75 genera and more than 300 species.  Ireland and Wales initiated a joint leatherback conservation effort between Swansea University and University College Cork. Sea Turtles. , Mating takes place at sea. Human-generated light from streetlights and buildings causes hatchlings to become disoriented, crawling toward the light and away from the beach. IUCN Status of these turtles are Hawksbill- Critically endangered Green turtle- Endangered Leatherback- Vulnerable Loggerhead- Vulnerable Olive Ridley- … Fertilization is internal, and multiple males usually mate with a single female. Scientists tracked a leatherback turtle that swam from Jen Womom beach of Tambrauw Regency in West Papua of Indonesia to the U.S. in a 20,000 km (12,000 mi) foraging journey over a period of 647 days. One cause for their endangered state is plastic bags floating in the ocean.  Turtles have a beak, not teeth. There are seven extant species worldwide, five of which can be found in the Red Sea: the green turtle, the hawksbill turtle, the loggerhead turtle, the olive ridley turtle and the leatherback turtle. For example, If you purchase the notes with “Download Validity == 2 Years,” on 01/01/2020, then you will be able to download the Static Files + Current Affairs files till 02/01/2022.  Off the northeastern coast of the South American continent, a few select beaches between French Guiana and Suriname are primary nesting sites of several species of sea turtles, the majority being leatherbacks. FAMILY: Dermochelyidae STATUS: Endangered throughout its range (Federal Register, June 2, 1970). Leatherback sea turtles, Dermochelys coriacea, are highly migratory predators that feed exclusively on gelatinous zooplankton, thus playing a unique role in coastal and pelagic food webs. The leatherback turtle is a species with a cosmopolitan global range. Sea turtles are large, aquatic reptiles with forelimbs specially modified for swimming. Studies on wild D. coriacea discovered individuals may spend as little as 0.1% of the day resting. Many leatherbacks meet an early end due to human activity. They nest at night when the risk of predation and heat stress is lowest.  In 2012, the National Oceanic and Atmospheric Administration designated 41,914 square miles of Pacific Ocean along California, Oregon, and Washington as "critical habitat". Since leatherback sea turtles had been reported to nest only at Espírito Santo's shore, but never in the state of Paraná, this unusual act brought much attention to the area, biologists have been protecting the nests and checking their eggs' temperature, although it might be that none of the eggs are fertile. The group, made up of both youth and elders from the tribe, is called Grupo Tortuguero Comaac.  In the state of Florida, there have been 603 leatherback strandings between 1980 and 2014. Leatherback turtles have the most hydrodynamic body design of any sea turtle, with a large, teardrop-shaped body. , The three major, genetically distinct populations occur in the Atlantic, eastern Pacific, and western Pacific Oceans.  A few hundred nest annually on the eastern coast of Florida. , Their favored breeding beaches are mainland sites facing the deep water, and they seem to avoid those sites protected by coral reefs. Leatherbacks have the widest global distribution of all reptile species, and possibly of any vertebrate.  In Malaysia, where the turtle is practically locally extinct, the eggs are considered a delicacy. Atlantic leatherbacks nest between February and July from South Carolina in the United States to the United States Virgin Islands in the Caribbean and to Suriname and Guyana. It has been listed as an EDGE species by the Zoological Society of London.. The leatherback sea turtle (Dermochelys coriacea), sometimes called the lute turtle or leathery turtle or simply the luth, is the largest of all living turtles and is the fourth-heaviest modern reptile behind three crocodilians.  In 1884, the American naturalist Samuel Garman described the species as Sphargis coriacea schlegelii. 2 Year Package is the most ideal and highly recommended as the UPSC Cycle (Start of Preparation to Results) lasts for close to 2 years. It is also unique among sea turtles, because instead of a bony carapace, it has leather-like outer skin in which is embedded a mosaic of small bones. Leatherback's front flippers can grow up to 2.7 m (8.9 ft) in large specimens, the largest flippers (even in comparison to its body) of any sea turtle.  On the other hand, one scientific paper has claimed that the species can weigh up to 1,000 kg (2,200 lb) without providing more verifiable detail.  In 2008, two turtles nested at Rantau Abang, and unfortunately, the eggs were infertile. However, their sister taxon is the extinct family Protostegidae that included other species that did not have a hard carapace..  In 1816, French zoologist Henri Blainville coined the term Dermochelys. Leatherback Turtle in Northwest Atlantic has been classified as “Endangered”. Leatherback sea turtle conservation has not had the same level of ongoing management. Birds, small mammals, and other opportunists dig up the nests of turtles and consume eggs. Three dead Leatherback Sea Turtles washed ashore in Massachusetts last weekend, Tony LaCasse, spokesperson for the New England Aquarium said. , D. coriacea is listed on CITES Appendix I, which makes export/import of this species (including parts) illegal. Pacific leatherback sea turtles mistake these plastic bags for jellyfish; an estimated one-third of adults have ingested plastic. Instead of scutes, it has thick, leathery skin with embedded minuscule osteoderms. They nest towards the dark and then return to the ocean and the light. The nighttime ritual involves excavating a hole in the sand, depositing around 80 eggs, filling the nest, leaving a large, disturbed area of sand that makes detection by predators difficult, and finally returning to the sea. , D. coriacea exhibits several anatomical characteristics believed to be associated with a life in cold waters, including an extensive covering of brown adipose tissue, temperature-independent swimming muscles, countercurrent heat exchangers between the large front flippers and the core body, and an extensive network of countercurrent heat exchangers surrounding the trachea. Turtle populations could improve seagrass ecosystem health by removing seagrass biomass and preventing sediment formation. et al., 1997. They can be found in the tropic and temperate waters of the Atlantic, Pacific, and Indian Oceans, as well as the Mediterranean Sea.  More typically, they swim at 1.80–10.08 km/h (1.12–6.26 mph). 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