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Title: First Report of Twinning in the Hawksbill Sea Turtle (Eretmochelys imbricata) from Khram Island, Chonburi Province, Thailand
Authors: JUNCHOMPOO, CHALATIP
PENPIAN, CHATCHAI
Keywords: Twinning
hawksbill sea turtle (Eretmochelys imbricata)
deformation
abnormal
embryo
Issue Date: Mar-2013
Publisher: Kyoto University Design School
Journal title: PROCEEDINGS of the Design Symposium on Conservation of Ecosystem (2013) (The 12th SEASTAR2000 workshop)
Start page: 17
End page: 20
Abstract: Twinning in reptiles and especially in the sea turtle, occurs rarely. During an investigation (May – August, 2011) of the nesting monitoring program on Khram Island, Chonburi, where an important nesting site in Thailand is located, we found that the number of female turtles has decreased. Unexpectedly, twinning in hawksbill turtle embryos has also been reported. This is the first discovery of such a phenomenon in the Gulf of Thailand. An un-hatched egg, with two fully developed embryos has been found. The embryos shared one yolk sac and differed substantially in size. The larger one has a carapace deformity with a 31.5 mm curved carapace width and a 22.5 mm length, while the smaller embryo has a normal carapace with a 16.5 mm width and a 18.5 mm length. However, the causes of twinning in sea turtles are still not well understood. Low temperature has been suggested as a possible factor. Other environmental or genetic factors could also be involved. For further studies, the pattern of the twins' and parental DNA should be investigated.
Description: February 20-21, 2012, BANGKOK, THAILAND
DOI: 10.14989/176195
URI: http://hdl.handle.net/2433/176195
Appears in Collections:PROCEEDINGS of the Design Symposium on Conservation of Ecosystem (The 12th SEASTAR2000 workshop)

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