Kemp's ridley sea turtle


Kemp's ridley sea turtle, also called the Atlantic ridley sea turtle, is the rarest species of sea turtle and is critically endangered. It is one of two living species in the genus Lepidochelys.

Taxonomy

This species of turtle is called Kemp's ridley because Richard Moore Kemp of Key West was the first to send a specimen to Samuel Garman at Harvard. However, the etymology of the name "ridley" itself is unknown. Prior to the term being popularly used, L. kempii at least was known as the "bastard turtle".
At least one source also refers to Kemp's ridley as a "heartbreak turtle". In her book The Great Ridley Rescue, Pamela Philips claimed the name was coined by fishermen who witnessed the turtles dying after being "turned turtle". The fishermen said the turtles "died of a broken heart".

Description

Kemp's ridley is the smallest of all sea turtle species, reaching maturity at carapace length and weighing only. Typical of sea turtles, it has a dorsoventrally depressed body with specially adapted flipper-like front limbs and a beak. Kemp's ridley turtle is the smallest of the sea turtles, with adults reaching a maximum of in carapace length and weighing a maximum of. The adult has an oval carapace that is almost as wide as it is long and is usually olive-gray in color. The carapace has five pairs of costal scutes. In each bridge adjoining the plastron to the carapace are four inframarginal scutes, each of which is perforated by a pore. The head has two pairs of prefrontal scales.
These turtles change color as they mature. As hatchlings, they are almost entirely a dark purple on both sides, but mature adults have a yellow-green or white plastron and a grey-green carapace
Kemp's ridley has a triangular-shaped head with a somewhat hooked beak with large crushing surfaces. The skull is similar to that of the olive ridley. Unlike other sea turtles, the surface on the squamosal bone where the jaw opening muscles originate, faces to the side rather than to the back.

Distribution and habitat

Kemp's ridley sea turtle generally prefers warm waters, but inhabits waters as far north as New Jersey. These turtles migrate to the Gulf of Mexico and the western Atlantic, where they often inhabit the waters off Louisiana, among other states that border the gulf .
Its geographic range includes the Atlantic Ocean and the Gulf of Mexico. Almost all females return each year to a single beach—Rancho Nuevo in the Mexican state of Tamaulipas—to lay eggs. The females arrive in large groups of hundreds or thousands in nesting aggregations called arribadas, which is a Spanish word for "arrivals".
It is rare for adult L. kempii to be found outside of the Gulf of Mexico, however juveniles regularly migrate to the east coast of North America from Florida, to New England. In the Atlantic Ocean 2-4% are adults, 11-15% sub-adults, and 81-87% are juveniles. Although not common, juveniles have been reported from Nova Scotia, Newfoundland, Ireland, the Scilly Isles, Great Britain, France, the Netherlands, Spain, Morocco, Malta, the Azores, Cameroon, and Venezuela.

Feeding and life history

Feeding

Kemp's ridley turtle feeds on mollusks, crustaceans, jellyfish, fish, algae or seaweed, and sea urchins. Juvenile Kemp's ridleys primarily feed on crabs.

Life history

Juvenile turtles tend to live in floating sargassum seaweed beds for their first years. Then they range between northwest Atlantic waters and the Gulf of Mexico while growing into maturity.
They reach sexual maturity at the age of 10–12.
This is the only species that nests primarily during the day, with 95% of all nesting occurring in Mexico in the state of Tamaulipas.
The nesting season for these turtles is April to August. They nest mostly on a 16-mile beach in the Mexican state of Tamaulipas and on Padre Island in the US state of Texas, and elsewhere on the Gulf coast. They mate offshore. Gravid females land in groups on beaches in what is commonly called an arribada or mass nesting. They prefer areas with dunes or, secondarily, swamps. The estimated number of nesting females in 1947 was 89,000, but shrank to an estimated 7,702 by 1985. Females nest two or three times during a season, keeping 10 to 20 days between nestings. Incubation takes 45 to 70 days. On average, around 110 eggs are in a clutch. The hatchlings' sex is decided by the temperature in the area during. If the temperature is below 29.5 °C, the offspring will be mainly male.

Conservation

Egg harvesting and pouching first depleted the numbers of Kemp's ridley sea turtles, but today, major threats include habitat loss, pollution, and entanglement in shrimping nets.
Efforts to protect L. kempii began in 1966 when Mexico's Instituto Nacional de Investigaciones Biologico-Pesqueras sent biologists Hunberto Chávez, Martin Contreras, and Eduardo Hernondez to the coast of southern Tamaulipas, Mexico to survey and instigate conservation plans. Kemp's ridley turtle was first listed under the Endangered Species Conservation Act of 1970 on December 2, 1970, and subsequently under the Endangered Species Act of 1973. In 1977 an informal, bi-national multi-agency The Kemp's Ridley Working Group first met to develop a recovery plan. A binational recovery plan was developed in 1984, and revised in 1992. A draft public review draft of the second revision was published by NOAA Fisheries in March 2010. This revision includes an updated threat assessment.
One mechanism used to protect turtles from fishing nets is the turtle excluder device. Because the biggest danger to the population of Kemp's ridley sea turtles is shrimp trawls, the device is attached to the shrimp trawl. It is a grid of bars with an opening at the top or bottom, fitted into the neck of the shrimp trawl. It allows small animals to slip through the bars and be caught while larger animals, such as sea turtles, strike the bars and are ejected, thus avoiding possible drowning.
In September 2007, Corpus Christi, Texas, wildlife officials found a record of 128 Kemp's ridley sea turtle nests on Texas beaches, including 81 on North Padre Island and four on Mustang Island. The figure was exceeded in each of the following 7 years. Wildlife officials released 10,594 Kemp's ridley hatchlings along the Texas coast that year. The turtles are popular in Mexico, as boot material and food.

Oil spills

Some Kemp's ridleys were airlifted from Mexico after the 1979 blowout of the Ixtoc 1 rig, which spilled millions of gallons of oil into the Gulf of Mexico.
Since April 30, 2010, 10 days after the accident on the Deepwater Horizon, 156 sea turtle deaths were recorded; most were Kemp's ridleys. Louisiana Department of Wildlife and Fisheries biologists and enforcement agents rescued Kemp's ridleys in Grand Isle. "Most" of the 456 oiled turtles that were rescued, cleaned, and released by US Fish and Wildlife Service were Kemp's ridleys.
Of the endangered marine species frequenting Gulf waters, only Kemp's ridley relies on the region as its sole breeding ground.
As part of the effort to save the species from some of the effects of the Deepwater Horizon oil spill, scientists took nests and incubated them elsewhere; 67 eggs were collected from a nest along the Florida Panhandle on June 26, 2010, and brought to a temperature-controlled warehouse at NASA's Kennedy Space Center, where 56 hatched, and 22 were released on 11 July 2010.
The overall plan was to collect eggs from about 700 sea turtle nests, incubate them, and release the young on beaches across Alabama and Florida over a period of months. Eventually, 278 nests were collected, including only a few Kemp's ridley nests.