Kemp's ridley sea turtle
| Kemp's Ridley | |
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| Researchers collecting Kemp's Ridley eggs | |
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| Species: | L. kempii
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| Binomial name | |
| Lepidochelys kempii | |
Kemp's Ridley (Lepidochelys kempii) is a critically endangered species of sea turtle. They are the smallest sea turtle species, growing less than a meter long and averaging only 45 kilograms (100 lb) as an adult. Their 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 their eggs. In the past their numbers were severely depleted through hunting, but today major threats include loss of habitat, pollution, and entanglement in fishing (shrimping) nets.
It was listed as endangered for the first time in the United States on December 2, 1970 and has received protection in Mexico since the 1960s.
Kemp's Ridley sea turtle changes color with its development. As hatchlings they are almost entirely a dark grey-black but when they become adults (the age of adulthood is debated, some say they reach maturity at the age of 7-15 but others claim that sexual maturity doesn't occur until the age of 35) they have a yellow-green or white plastron and a grey-green carapace.
The estimated number of nesting females in the year of 1947 was 42,000 but it dove to an estimated 1,000 by the mid 1980s.
One of the suggested mechanisms to assist the population in its regrowth is the Turtle Excluder Device (TED). Due to the fact that the biggest hit to the population of Kemp’s Ridley sea turtles is shrimp trawls, this device is attached to the shrimp trawl. It is a grid of bars with an opening at the top or bottom. It is fitted into the neck of the shrimp trawl in a manner as to allow small animals to slip through the bars and be caught in the bag while larger animals such as sea turtles may strike the bars and be ejected through the opening thus avoiding possible drowning.
These turtles are called Kemp's Ridley because Richard Kemp (of Key West) was the first to send in a specimen of the species to Samuel Garman at Harvard.
Kemp's Ridley sea turtles are nicknamed the "Heartbreak Turtle" because when they died on deck of boats they would lie on their backs so fishermen would say that it died of a broken heart.
The nesting season for these turtles is between April to June, though some nest as late as July or August. They nest mostly in the Mexican state of Tamaulipas, but they sometimes on Padre Island in the U.S state of Texas. The adult sea turtles mate offshore and when a powerful wind blows from the north the females land in groups on the beach (they prefer areas with dunes followed by swamps). They are the only species of sea turtle known to lay their eggs during the day.
Females nest three times during a season with roughly 10 to 28 days between nestings. Incubation can take anywhere from 45 to 70 days. There are, on average, around 110 eggs per nesting.
The sex of hatchlings is decided by the temperature in the area during incubation. If the temperature is below 29.5 degrees Celsius the offspring will be mainly male.
On its head it has a "beak" of sorts used to grab and break up crabs on which it prefers to feed.
References
- Template:IUCN2006 Database entry includes a brief justification of why this species is critically endangered and the criteria used
See also
- Chelonioidea. The sea turtle superfamily.
External links
- http://www.ridleyturtles.org
- http://seamap.env.duke.edu/species/tsn/551770
- http://www.turtles.org/ridleyd.htm
- http://www.cresli.org/cresli/turtles/kemprid.html
- IUCN Red List of Threatened Species: Lepiochelys kempi
- Florida Sea Turtle information Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute
http://www.tpwd.state.tx.us/publications/pwdpubs/media/pwd_bk_w7000_0013_kemps_ridley_sea_turtle.pdf