Species of turtle in the family Cheloniidae
 ;templatestyles src="Template:Taxobox/core/styles.css" / ;
The olive ridley sea turtle (Lepidochelys olivacea), also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae. The species is the second-smallest and most abundant of all sea turtles found in the world. "L. olivacea" is found in warm and tropical waters, primarily in the Pacific and Indian Oceans, but also in the warm waters of the Atlantic Ocean.
This turtle and the related Kemp's ridley sea turtle are best known for their unique synchronised mass nestings called "arribadas", where thousands of females come together on the same beach to lay eggs.
Taxonomy.
The olive ridley sea turtle may have been first described as "Testudo mydas minor" by Georg Adolf Suckow in 1798. It was later described and named "Chelonia multiscutata" by Heinrich Kuhl in 1820. Still later, it was described and named "Chelonia olivacea" by Johann Friedrich von Eschscholtz in 1829. The species was placed in the subgenus "Lepidochelys" by Leopold Fitzinger in 1843. After "Lepidochelys" was elevated to full genus status, the species was called "Lepidochelys olivacea" by Charles Frédéric Girard in 1858. Because Eschscholtz was the first to propose the specific epithet "olivacea", he is credited as the binomial authority or taxon author in the valid name "Lepidochelys olivacea" (Eschscholtz, 1829). The parentheses indicate that the species was originally described in a different genus.
The generic name, "Lepidochelys", is derived from the Greek words "lepidos", meaning scale, and "chelys", which translates to turtle. This could possibly be a reference to the supernumerary costal scutes characteristic of this genus. The etymology of the English vernacular name "olive" is somewhat easier to resolve, as its carapace is olive green in color. However, the origin of "ridley" is unknown, perhaps derived from "riddle". "Lepidochelys" is the only genus of sea turtles containing more than one extant species: "L. olivacea" and the closely related "L. kempii" (Kemp's ridley).
Description.
Growing to about in carapace length (measured along the curve), the olive ridley sea turtle gets its common name from its olive-colored carapace, which is heart-shaped and rounded. Males and females grow to the same size, but females have a slightly more rounded carapace as compared to males. The heart-shaped carapace is characterized by four pairs of pore-bearing inframarginal scutes on the bridge, two pairs of prefrontals, and up to nine lateral scutes per side. "L. olivacea" is unique in that it can have variable and asymmetrical lateral scute counts, ranging from five to nine plates on each side, with six to eight being most commonly observed. Each side of the carapace has 12–14 marginal scutes.
The carapace is flattened dorsally and highest anterior to the bridge. it has a medium-sized, broad head that appears triangular from above. The head's concave sides are most obvious on the upper part of the short snout. It has paddle-like fore limbs, each having two anterior claws. The upper parts are grayish-green to olive in color, but sometimes appear reddish due to algae growing on the carapace. The bridge and hingeless plastron of an adult vary from greenish white in younger individuals to a creamy yellow in older specimens (maximum age is up to 50 years).
Hatchlings are dark gray with a pale yolk scar, but appear all black when wet. Carapace length of hatchlings ranges from . A thin, white line borders the carapace, as well as the trailing edge of the fore and hind flippers. Both hatchlings and juveniles have serrated posterior marginal scutes, which become smooth with age. Juveniles also have three dorsal keels; the central longitudinal keel gives younger turtles a serrated profile, which remains until sexual maturity is reached.
The olive ridley sea turtle rarely weighs over 50 kg (110 lb). Adults studied in Oaxaca, Mexico, ranged from ; adult females weighed an average of (n=58), while adult males weighed significantly less, averaging (n=17). Hatchlings usually weigh between .
Adults are sexually dimorphic. The mature male has a longer and thicker tail, which is used for copulation, and the presence of enlarged and hooked claws on the male's front flippers allows him to grasp the female's carapace during copulation. The male also has a longer, more tapered carapace than the female, which has a rounded, dome-like carapace. The male also has a more concave plastron, believed to be another adaptation for mating. The plastron of the male may also be softer than that of the female.
Distribution.
The olive ridley turtle has a circumtropical distribution, living in tropical and warm waters of the Pacific and Indian Oceans from India, Arabia, Japan, and Micronesia south to southern Africa, Australia, and New Zealand. In the Atlantic Ocean, it has been observed off the western coast of Africa and the coasts of northern Brazil, Suriname, Guyana, French Guiana, and Venezuela. Additionally, the olive ridley has been recorded in the Caribbean Sea as far north as Puerto Rico. A female was found alive on an Irish Sea beach on the Isle of Anglesey, Wales, in November 2016, giving this species its northernmost appearance. It was taken in by the nearby Anglesey Sea Zoo, while its health was assessed. A juvenile female was found off the coast of Sussex in 2020. The olive ridley is also found in the eastern Pacific Ocean from the Galápagos Islands and Chile north to the Gulf of California, and along the Pacific coast to at least Oregon. Migratory movements have been studied less intensely in olive ridleys than other species of marine turtles, but they are believed to use the coastal waters of over 80 countries. Historically, this species has been widely regarded as the most abundant sea turtle in the world. More than one million olive ridleys were commercially harvested off the coasts of Mexico in 1968 alone.
The population of Pacific Mexico was estimated to be at least 10 million prior to the era of mass exploitation. More recently, the global population of annual nesting females has been reduced to about two million by 2004, and was further reduced to 852,550 by 2008. This indicated a dramatic decrease of 28 to 32% in the global population within only one generation (i.e., 20 years).
Olive ridley sea turtles are considered the most abundant, yet globally they have declined by more than 30% from historic levels. These turtles are considered endangered because of their few remaining nesting sites in the world. The eastern Pacific turtles have been found to range from Baja California, Mexico, to Chile. Pacific olive ridleys nest around Costa Rica, Mexico, Nicaragua, and the northern Indian Ocean; the breeding colony in Mexico was listed as endangered in the US on July 28, 1978.
Nesting grounds.
Olive ridley turtles exhibit two different nesting behaviours: solitary nesting (the most prevalent) and synchronized mass nesting, termed "arribadas". They are unique among sea turtle species in the latter behaviour, for which they are best known. Females return to the same beach from where they hatched, to lay their eggs. They lay their eggs in conical nests about 1.5 ft deep, which they laboriously dig with their hind flippers. In the Indian Ocean, Arabian Sea near Honavar in Karnataka , the majority of Olive Ridleys nest in two or three large assemblies near Gahirmatha in Odisha. The coast of Odisha in India is one of the largest mass nesting sites for the Olive Ridley, along with the coasts of Mexico and Costa Rica. In 1991, over 600,000 turtles nested along the coast of Odisha in one week. Solitary nesting also occurs in Lothian Island Wildlife Sanctuary in West Bengal &amp; along the Coromandel Coast and Sri Lanka, but in scattered locations. However, olive ridleys are considered a rarity in most areas of the Indian Ocean. Some nesting populations exist in islands of Bangladesh near Cox's Bazar.
They are also rare in the western and central Pacific, with known "arribadas" occurring only within the tropical eastern Pacific, in Central America and Mexico. In Costa Rica, they occur at Nancite and Ostional beach, and a third "arribada" beach seems to be emerging at Corozalito. Two active "arribada" beaches are located in Nicaragua, Chacocente and La Flor, with a smaller "arribada" beach of unknown status on the Pacific coast of Panama. Historically, "arribadas" happened at several beaches in Mexico, but in the present "arribadas" are only observed at Playa Escobilla and Morro Ayuda in Oaxaca, and Ixtapilla in Michoacan.
Although olive ridleys are famed for their "arribadas", most of the known nesting beaches are only frequented by solitarily nesting females and support a relatively small quantity of nests (100 to 3,000 nests). The overall contribution and importance of solitary nesting females to the population may be underestimated by the scientific community as the hatching success rate of nests at arribada beaches is generally low, but high at solitary nesting beaches.
Isolated, irregular nesting events also sporadically occur within the species' range.
Foraging grounds.
Some of the olive ridley's foraging grounds near Southern California are contaminated due to sewage, agricultural runoff, pesticides, solvents, and industrial discharges. These contaminants have been shown to decrease the productivity of the benthic community, which negatively affects these turtles, which feed from these communities. The increasing demand to build marinas and docks near Baja California and Southern California are also negatively affecting the olive ridleys in these areas, where more oil and gasoline will be released into these sensitive habitats. Another threat to these turtles is power plants, which have documented juvenile and subadult turtles becoming entrained and entrapped within the saltwater cooling intake systems.
Ecology and behavior.
Reproduction.
Mating is often assumed to occur in the vicinity of nesting beaches, but copulating pairs have been reported over 1,000 km from the nearest beach. Research from Costa Rica revealed the number of copulating pairs observed near the beach could not be responsible for the fertilization of the tens of thousands of gravid females, so a significant amount of mating is believed to have occurred elsewhere at other times of the year.
The Gahirmatha Beach in Kendrapara district of Odisha (India), which is now a part of the Bhitarkanika Wildlife Sanctuary, is the largest breeding ground for these turtles. The Gahirmatha Marine Wildlife Sanctuary, which bounds the Bhitarkanika Wildlife Sanctuary to the east, was created in September 1997, and encompasses Gahirmatha Beach and an adjacent portion of the Bay of Bengal. Bhitarkanika mangroves were designated a Ramsar Wetland of International Importance in 2002. It is the world's largest known rookery of olive ridley sea turtles. Apart from Gahirmatha rookery, two other mass nesting beaches have been located, which are on the mouth of rivers Rushikulya and Devi. The spectacular site of mass congregation of olive ridley sea turtles for mating and nesting enthralls both the scientists and the nature lovers throughout the world.
Olive ridley sea turtles migrate in huge numbers from the beginning of November, every year, for mating and nesting along the coast of Orissa. Gahirmatha coast has the annual nesting figure between 100,000 and 500,000 each year. A decline in the population of these turtles has occurred in the recent past due to mass mortality. The olive ridley sea turtle has been listed on Schedule – I of the Indian Wildlife (Protection) Act, 1972 (amended 1991). The species is listed as vulnerable under IUCN. The sea turtles are protected under the 'Migratory Species Convention' and Convention of International Trade on Wildlife Flora and Fauna (CITES). India is a signatory nation to all these conventions. The homing characteristics of the ridley sea turtles make them more prone to mass casualty. The voyage to the natal nesting beaches is the dooming factor for them. Since Gahirmatha coast serves as the natal nesting beach for millions of turtles, it has immense importance on turtle conservation.
Olive ridleys generally begin to aggregate near nesting beaches about two months before nesting season, although this may vary throughout their range. In the eastern Pacific, nesting occurs throughout the year, with peak nesting events ("arribadas") occurring between September and December. Nesting beaches can be characterized as relatively flat, midbeach zone, and free of debris. Beach fidelity is common, but not absolute. Nesting events are usually nocturnal, but diurnal nesting has been reported, especially during large "arribadas". Exact age of sexual maturity is unknown, but this can be somewhat inferred from data on minimum breeding size. For example, the average carapace length of nesting females (n = 251) at Playa Nancite, Costa Rica, was determined to be 63.3 cm,