Five species of foraging and breeding sea turtles have been identified in Vietnam, they are Green... more Five species of foraging and breeding sea turtles have been identified in Vietnam, they are Green turtle (Chelonia mydas), Loggerhead turtle (Caretta caretta), Olive ridley turtle (Lepidochelys olivacea), Hawksbill turtle (Eretmochelys imbricata) and Leatherback turtle (Dermochelys coriacea). Among them, with the exception of Loggerhead turtle (Caretta caretta), four species have been being lay eggs on the beaches along the country. However, these populations have been strongly suffered by human activities for decades. The number of foraging and breeding Hawksbill and Leatherback sea turtles has dramatically decreased, and Olive Ridley turtle has almost disappeared on their traditional nesting beaches. Beside the reason of harvesting eggs and nesting turtles by catch or by purpose, the developments in coastal areas where sea turtles laying eggs such as in shrimp aquaculture, tourist resort and residential area developments etc., also contributed to this decline of sea turtles. Despite the fact that the recent raising awareness programs on protection and conservation of the sea turtle were very well done with the participation of many organizations and provinces, this important animals still face the risk of extinction in Vietnam.
Before 1980s, the study areas were a big nesting ground for sea turtles in Vietnam. Three species... more Before 1980s, the study areas were a big nesting ground for sea turtles in Vietnam. Three species of sea turtle used to nest here including Green turtle (Chelonia mydas), Hawksbill turtle (Eretmochelys imbricata) and Leatherback turtle (Dermochelys coriacea). The most important beaches can be listed as follows: long beach at Binh Son, Long beach at Hoai Nhon, Cat Tien beach at Phu Cat, Xep beach at Dong Hoa. The foraging population of sea turtle concentrated from the rock reef of Nhon Ly (Binh Dinh) to Tuy An (Phu Yen). This area has a number of rock reefs and coral reefs, suitable for sea turtle living and foraging. Recently, only Green turtle are still nesting at Hon Kho and Hai Giang beaches (Nhon Hai district, Binh Dinh) with a small number (about 5 to 10 individuals per year). The other beaches sometimes have sea turtles observed to nest but with very small number (1 or 2 individuals per year) and not frequently.
Sand temperatures and loggerhead turtle nest temperatures (Caretta caretta) at Mon Repos rookery ... more Sand temperatures and loggerhead turtle nest temperatures (Caretta caretta) at Mon Repos rookery (Australia) were monitored over the 2005–06 and 2006–07 nesting seasons and hatchling sex ratios of clutches were estimated using the Constant Temperature Equivalent method. Nest temperatures were positively correlated with the sand temperature and air temperature in both seasons. Both seasons produced a female-biased sex ratio, especially the 2005–06 season, when almost all hatchlings were predicted to be female. Hatch success rate was not affected by nest temperature and averaged 85%, but hot nests from 2005–06 had a reduced emergence success compared with other nests. Daily cyclic temperature fluctuations of 0.5–1.5°C were a feature of nests, with a tendency for greater daily amplitude in the 2005–06 season when the average daily temperature was hotter. These daily temperature fluctuations increased the constant temperature equivalent temperature by 0.1–0.5°C above mean nest temperatu...
is situated on the northeastern coast of Vietnam, about 100 km east of Hanoi Capital. It is the t... more is situated on the northeastern coast of Vietnam, about 100 km east of Hanoi Capital. It is the third largest city in Vietnam and has the largest seaport in the northern part of the country. It covers an area of 1,519 km 2 , including two island districts (Cat Hai and Bach Long Vi). In the mainland, Hai Phong shares administrative borders to 3 provinces of East of Tonkin and Hong River Delta, including Quang Ninh in the North, Hai Duong in the Northwest and Thai Binh in the Southwest. The east of the city, there is 125 km of coastlines from Lach Huyen mouth to Thai Binh River mouth. This is lower section area of 5 main rivers of Thai
Five species of foraging and breeding sea turtles have been identified in Vietnam, they are Green... more Five species of foraging and breeding sea turtles have been identified in Vietnam, they are Green turtle (Chelonia mydas), Loggerhead turtle (Caretta caretta), Olive ridley turtle (Lepidochelys olivacea), Hawksbill turtle (Eretmochelys imbricata) and Leatherback turtle (Dermochelys coriacea). Among them, with the exception of Loggerhead turtle (Caretta caretta), four species have been being lay eggs on the beaches along the country. However, these populations have been strongly suffered by human activities for decades. The number of foraging and breeding Hawksbill and Leatherback sea turtles has dramatically decreased, and Olive Ridley turtle has almost disappeared on their traditional nesting beaches. Beside the reason of harvesting eggs and nesting turtles by catch or by purpose, the developments in coastal areas where sea turtles laying eggs such as in shrimp aquaculture, tourist resort and residential area developments etc., also contributed to this decline of sea turtles. Despite the fact that the recent raising awareness programs on protection and conservation of the sea turtle were very well done with the participation of many organizations and provinces, this important animals still face the risk of extinction in Vietnam.
Before 1980s, the study areas were a big nesting ground for sea turtles in Vietnam. Three species... more Before 1980s, the study areas were a big nesting ground for sea turtles in Vietnam. Three species of sea turtle used to nest here including Green turtle (Chelonia mydas), Hawksbill turtle (Eretmochelys imbricata) and Leatherback turtle (Dermochelys coriacea). The most important beaches can be listed as follows: long beach at Binh Son, Long beach at Hoai Nhon, Cat Tien beach at Phu Cat, Xep beach at Dong Hoa. The foraging population of sea turtle concentrated from the rock reef of Nhon Ly (Binh Dinh) to Tuy An (Phu Yen). This area has a number of rock reefs and coral reefs, suitable for sea turtle living and foraging. Recently, only Green turtle are still nesting at Hon Kho and Hai Giang beaches (Nhon Hai district, Binh Dinh) with a small number (about 5 to 10 individuals per year). The other beaches sometimes have sea turtles observed to nest but with very small number (1 or 2 individuals per year) and not frequently.
Sand temperatures and loggerhead turtle nest temperatures (Caretta caretta) at Mon Repos rookery ... more Sand temperatures and loggerhead turtle nest temperatures (Caretta caretta) at Mon Repos rookery (Australia) were monitored over the 2005–06 and 2006–07 nesting seasons and hatchling sex ratios of clutches were estimated using the Constant Temperature Equivalent method. Nest temperatures were positively correlated with the sand temperature and air temperature in both seasons. Both seasons produced a female-biased sex ratio, especially the 2005–06 season, when almost all hatchlings were predicted to be female. Hatch success rate was not affected by nest temperature and averaged 85%, but hot nests from 2005–06 had a reduced emergence success compared with other nests. Daily cyclic temperature fluctuations of 0.5–1.5°C were a feature of nests, with a tendency for greater daily amplitude in the 2005–06 season when the average daily temperature was hotter. These daily temperature fluctuations increased the constant temperature equivalent temperature by 0.1–0.5°C above mean nest temperatu...
is situated on the northeastern coast of Vietnam, about 100 km east of Hanoi Capital. It is the t... more is situated on the northeastern coast of Vietnam, about 100 km east of Hanoi Capital. It is the third largest city in Vietnam and has the largest seaport in the northern part of the country. It covers an area of 1,519 km 2 , including two island districts (Cat Hai and Bach Long Vi). In the mainland, Hai Phong shares administrative borders to 3 provinces of East of Tonkin and Hong River Delta, including Quang Ninh in the North, Hai Duong in the Northwest and Thai Binh in the Southwest. The east of the city, there is 125 km of coastlines from Lach Huyen mouth to Thai Binh River mouth. This is lower section area of 5 main rivers of Thai
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