After the first six different so-called nauplius larvae, a seventh non-feeding larva develops: the cyprid. These early life stages are still mobile and facilitate further distribution. Green turtle with a single barnacle, Maldives ©Stephanie Köhnk. Russian Journal of Marine Biology 44: 254-261. On a Poorly Known Rookery of Green Turtles (Chelonia mydas) Nesting at the Chabahar Beach, Northeastern Gulf of Oman. Sinaei M, Bolouki M, Ghorbganzadeh-Zaferani G, Matin MT, Alimoradi M and Dalir S 2018.The value of long-term, community-based monitoring of marine turtle nesting: a study in the Lamu archipelago, Kenya. Olendo MI, Okemwa GM, Munga CN, Mulupi LK, Mwasi LD, Mxolisi Sibanda HBM and Ong’anda HO 2019.The Status and Conservation of Sea Turtles in Kenya. Seasonal fluctuations in sand temperature: effects on the incubation period and mortality of loggerhead sea turtle (Caretta caretta) pre-emergent hatchlings in Minabe, Japan. Matsuzawa Y, Sato K, Sakamoto W and Bjorndal KA 2002.Citizen science surveys elucidate key foraging and nesting habitat for two endangered marine turtle species within the Republic of Maldives. Hudgins JA, Hudgins EJ, Ali K and Mancini A 2017.Green turtle hatchlings in the Maldives emerge from their nest after between 49 and 62 days. Younger female turtles may follow older, experienced nesting turtles from their feeding grounds to the breeding site.Beach characteristics used may include smell, low-frequency sound, magnetic fields, the characteristics of seasonal offshore currents and celestial cues. It is believed that hatchlings imprint the unique qualities of their natal beach while still in the nest and/or during their trip from the nest to the sea.
Whether they actually use this ability to navigate is the next idea being investigated.
Early experiments seem to show that sea turtles have the ability to detect magnetic fields. Using these two characteristics, a sea turtle may be able to determine its latitude and longitude, enabling it to navigate virtually anywhere. They can detect both the angle and intensity of the earth’s magnetic field.There are several theories as to how sea turtles are able to return to their birthplace to nest, but none have yet been proven. Although some sea turtles may return to the beach where they were born to nest (natal homing), equally many will nest on a different beach in the same region where they were born.
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