Chelonia mydas

À quelques jours de la Journée mondiale de la tortue marine, le Mémorandum d’entente sur la conservation et la gestion des tortues marines et de leurs habitats de l’océan Indien et de l’Asie du Sud-Est (MdE Tortues marines de l’IOSEA) fêtait son vingtième anniversaire.

25 Jun 2021

La 2ème réunion du Groupe de travail sur les tortues marines du nord de l’océan Indien, mis en place par le MdE de la CMS sur les tortues marines de la région IOSEA, s’est tenue les 29 et 30 janvier et était organisée par le Ministère de la conservation des espèces sauvages du Sri Lanka, à Colombo. Ouverte par le Secrétaire Douglas Nanayakkara, du Ministère du Développement durable et des espèces sauvages, le principal objectif de la réunion était de trouver un accord sur des actions régionales concertées afin de conserver les tortues marines.

30 Jan 2018
Description: 

The green turtle (Chelonia mydas) is the largest of all the hard-shelled sea turtles, growing up to one meter long and weighing 130-160 kg. In the western Indian Ocean adult females are larger than males, and have a more "bullseye" pattern in the scutes of the carapace.

Adult green turtles are unique among sea turtles in that as large immatures and adults they are primarily herbivorous, feeding on seagrasses and algae. Green turtles take between 20 and 50 years just to reach sexual maturity.  Females return to their natal beaches (i.e., the same beaches where they were born) every 2 to 4 years to nest, laying several clutches of about 125 eggs at roughly 14-day intervals several times in a season. However, very few hatchlings survive to reach maturity – perhaps fewer than one in 1,000.

The green turtle is globally distributed and generally found in tropical and subtropical waters along continental coasts and islands roughly between 30°N and 30°S. Green turtles primarily use three types of habitat: oceanic beaches (for nesting), convergence zones in the open ocean, and benthic feeding grounds in coastal areas.

Adults migrate from foraging areas to mainland or island nesting beaches and may travel hundreds or thousands of kilometers each way. After emerging from the nest, hatchlings enter the sea and swim offshore where they enter longshore currents that take them to various oceanic areas where they are believed to get caught up in major oceanic current systems and live for several years, feeding close to the surface on a variety of pelagic plants and animals. Once the immatures reach a certain age/size range, they leave the pelagic habitat and travel to nearshore foraging grounds. Once they move to these nearshore benthic habitats, large immature and adult green turtles are almost exclusively herbivores, feeding on sea grasses and algae.

The Indian Ocean hosts some of the largest nesting populations of green turtles anywhere, particularly on oceanic islands in the southwest and on islands in SE Asia. Many of these populations are now recovering after intense exploitation in the last century dramatically reduced the populations.  However, some populations are still declining. The green turtle is one of the most widely distributed and commonest of the marine turtle species in the Indian Ocean. Interactions with fishing operations are especially important threats in coastal fisheries where nets are employed, but trawl fisheries may also have important impacts.

During the 19th and 20th centuries intense exploitation of green turtles provided onboard red meat for sustained cruises of sailing vessels before the time of refrigeration, as well as meat and calipee for an international market. Several nesting populations in the Indian Ocean were devastated as a result.

Information d'évaluation
Instruments de la CMSCMS, IOSEA Marine Turtles, Atlantic Turtles
IUCN StatusEndangered
Date of entry in Appendix I1979
Date d'inscription à l'Annexe II1979
Répartition géographique
Pays Algeria, Angola, Antigua and Barbuda, Australia, Bahamas, Bahrain, Bangladesh, Barbados, Belize, Benin, Brazil, Brunei Darussalam, Cabo Verde, Cambodia, Cameroon, Canada, Chile, China, Colombia, Comoros, Congo (Brazzaville), Cook Islands, Costa Rica, Cuba, Cyprus, Democratic Republic of the Congo (Kinshasa), Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Fiji, France, Gabon, Gambia, Ghana, Greece, Grenada, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, India, Indonesia, Iran, Iraq, Israel, Italy, Jamaica, Japan, Kenya, Kiribati, Kuwait, Lebanon, Liberia, Libya, Madagascar, Malaysia, Maldives, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Morocco, Mozambique, Myanmar, Namibia, Nauru, Netherlands, New Zealand, Nicaragua, Nigeria, Niue, Oman, Pakistan, Palau, Panama, Papua New Guinea, Peru, Philippines, Portugal, Qatar, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Saudi Arabia, Senegal, Seychelles, Sierra Leone, Singapore, Slovenia, Solomon Islands, Somalia, South Africa, Spain, Sri Lanka, Sudan, Suriname, Syrian Arab Republic, São Tomé and Príncipe, Thailand, Timor-Leste, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Tuvalu, United Arab Emirates, United Kingdom, United Kingdom, United Republic of Tanzania, United States of America, Uruguay, Vanuatu, Venezuela, Viet Nam, Yemen

Pas de photo pour Chelonia mydas

Noms communs
AnglaisGreen Turtle
FrançaisTortue Verte
EspagnolTortuga verde
AllemandPazifische Suppenschildkröte
Taxonomie
ClasseReptilia
OrdreTestudinata
FamilleCheloniidae
Nom scientifique Chelonia mydas
Author(Linnaeus, 1758)
Standard referenceEckert, K.L., Bjorndal, K.A., Abreu-Grobois, F.A. and Donnelly, M. (Eds) (1999). Research and management techniques for the conservation of sea turtles. IUCN/SSC Marine Turtle Specialist Group Publication No.4.

COVID-19 ET ESPÈCES MIGRATRICES

Faits et informations sur la maladie du coronavirus (COVID-19) et la faune migratrice.  En savoir plus

Other details
Additional notesIn Effect 7/1/1999

Contenu lié