Yangtze giant softshell turtle

Last updated

Yangtze giant softshell turtle
Rua Dong Mo.jpg
One of the two R. swinhoei of Dong Mo, Son Tay, Vietnam
CITES Appendix II (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Family: Trionychidae
Genus: Rafetus
Species:
R. swinhoei
Binomial name
Rafetus swinhoei
(Gray, 1873)
Rafetus2.png
Yangtze giant softshell turtle range
Synonyms [3]
List
  • Oscaria swinhoei
    Gray, 1873
  • Yuen elegans
    Heude, 1880
  • Yuen leprosus
    Heude, 1880
  • Yuen maculatus
    Heude, 1880
  • Yuen pallens
    Heude, 1880
  • Yuen viridis
    Heude, 1880
  • Trionyx swinhonis
    Boulenger, 1889
  • Pelodiscus swinhoei
    — Baur, 1893
  • Trionyx swinhoei
    — Siebenrock, 1902
  • Amyda swinhoei
    — Mertens, L. Müller & Rust, 1934
  • Pelochelys taihuensis
    Zhang, 1984
  • Trionyx liupani
    Tao, 1986
  • Rafetus swinhoei
    — Meylan, 1987
  • Pelochelys maculatus
    — Zhao, 1997
  • Pelochlys maculatus
    — Zhao, 1997
  • Rafetus leloii
    Hà Dình Dúc, 2000
    ( nomen nudum )
  • Rafetus hoankiemensis
    Devaux, 2001
    (nomen nudum)

The Yangtze giant softshell turtle (Rafetus swinhoei), also commonly known as the Red River giant softshell turtle, the Shanghai softshell turtle, the speckled softshell turtle, and Swinhoe's softshell turtle, is a critically endangered species of turtle in the family Trionychidae. It is regarded as one of the largest living freshwater turtle species. Native to eastern and southern China and northern Vietnam, the species has a known population of only two or three individuals, and the absence of fertile females has rendered it functionally extinct.

Contents

Description

The Yangtze giant softshell turtle is recognized for its deep head, pig-like snout, and dorsally positioned eyes. As a critically endangered species, it is widely regarded as the largest freshwater turtle in the world. [4] Although comparisons are limited due to the small number of known specimens, its average and maximum sizes surpass those of other large freshwater turtles, such as the alligator snapping turtle and related giant softshell species, including other Rafetus and Pelochelys species. [5]

Adult specimens exceed 100 cm (39 in) in length and 70 cm (28 in) in width, with weights ranging from 70–100 kg (150–220 lb). [6] A study of large turtles from the Yangtze River reported an average weight of 25 kg (55 lb), although not all specimens were definitively identified as Rafetus. [7]

The turtle’s carapace (shell) typically measures over 50 cm (20 in), with the largest recorded at 86 cm (34 in) in straight length. Curved carapace lengths of up to 106 cm (42 in) have also been reported. Exceptional specimens, primarily from Vietnam, are believed to have weighed between 220 to 247.5 kg (485 to 546 lb). [8] [9] The head measures over 20 cm (7.9 in) in length and 10 cm (3.9 in) in width.

Sexual dimorphism is present, with males generally smaller than females but possessing longer, more prominent tails. [10]

Known individuals

Currently, only two or three living individuals of the Yangtze giant softshell turtle are known to exist: one in captivity in China and one or two in the wild in Vietnam. [11]

The species' decline has been marked by significant losses in recent years. A wild individual in Vietnam was reported dead in January 2016, and the last captive female at the Suzhou Zoo in China died in April 2019 following an artificial insemination attempt. [12] [13]

In October 2020, a wild female was discovered in Dong Mo Lake in Vietnam, giving conservationists renewed hope. However, this individual was found dead in early 2023, further diminishing the species' chances of survival. [14] [15]

An additional individual is believed to have been sighted in the same area, though its exact status remains uncertain. The known surviving turtles are thought to include one at the Suzhou Zoo and potentially one in the nearby Xuan Khanh Lake. [15] [16]

Geographic range

The Yangtze giant softshell turtle historically inhabited the Yangtze River and Lake Tai, located on the border of Jiangsu and Zhejiang provinces in eastern China, as well as areas in southern China, including Gejiu, Yuanyang, Jianshui, and Honghe in Yunnan Province. [17]

Two specimens captured from Gejiu in the 1970s were kept at the Beijing Zoo and the Shanghai Zoo but died in 2005 and 2006, respectively.

In Vietnam, the species has been observed in Hoan Kiem Lake in Hanoi on several occasions, including documented sightings in 1999, 2000, and 2005. [18] The turtle captured from the lake in April 2011, which was treated for open sores potentially caused by pollution, injuries from fishing hooks, or other turtles, was later found dead in January 2016. [19] [20]

In recent years, individuals have been identified in Dong Mo Lake and Xuan Khanh Lake in Vietnam. A turtle discovered in Dong Mo Lake in 2020 was confirmed to be female, but it died in April 2023. Another individual of unspecified gender is thought to inhabit the same lake, while an additional turtle is believed to live in Xuan Khanh Lake. [11] [15]

Ecology and behaviour

Diet

The Yangtze giant softshell turtle primarily feeds on a diet of fish, crabs, snails, frogs, and aquatic vegetation such as water hyacinths and "green rice leaves."[ citation needed ]

Reproduction

The species typically lays between 20 and 80 eggs per clutch, with nesting occurring at night or during the early morning. [10]

In an attempt to prevent extinction, a fertile female from the Changsha Zoo was transferred to the Suzhou Zoo in 2008 to breed with the only known male in captivity, a 100-year-old individual. The move, coordinated by the Wildlife Conservation Society and the Turtle Survival Alliance, involved transporting the female over 1,000 km (600 miles). [21] Despite this effort, breeding attempts have largely failed. By 2013, six breeding seasons had produced 80 eggs, none of which were viable. [22]

Artificial insemination was first attempted in 2015. While the process successfully fertilized a female, the eggs laid during two clutches were not viable. This female died in April 2019 after a subsequent insemination attempt. [23] [12] [13]

Behaviour

Despite its large size and distinctive appearance, the Yangtze giant softshell turtle is highly elusive. It spends most of its time submerged in deep water and surfaces only briefly to breathe, which complicates efforts to observe or identify wild individuals. [24]

Relationship with humans

Scientific description and systematics

The Yangtze giant softshell turtle was first described in 1873 by John Edward Gray, a turtle expert at the British Museum, who named it Oscaria swinhoei after English biologist Robert Swinhoe, who had sent a specimen from Shanghai. Gray described the species as "the most beautiful species of Trionychidae that has yet occurred." [25]

In 1880, Pierre Marie Heude, a Shanghai-based Jesuit missionary, obtained multiple specimens of the species from the Huangpu River and Lake Tai. Believing the specimens exhibited significant variation, he described them as five distinct species: Yuen leprosus, Yuen maculatus, Yuen elegans, Yuen viridis, and Yuen pallens. The genus name Yuen derives from the Chinese 鼋 (yuan), meaning "large turtle." Later, zoologists reclassified the species under different genera, including Trionyx , Pelodiscus , and Pelochelys . In 1987, Peter Andre Meylan placed the species under the genus Rafetus. [26]

The taxonomic status of the closely related Hoan Kiem turtle (Rafetus leloii) remains controversial. While most herpetologists consider R. leloii a junior synonym of Rafetus swinhoei, some Vietnamese biologists, such as Ha Dinh Duc and Le Tran Binh, argue that it is a distinct species based on genetic and morphological differences. Critics, including Farkas et al., have attributed these differences to age-related variation and noted that the genetic data used by Le et al. were not submitted to GenBank. They also criticized the violation of ICZN Code rules when renaming R. leloii as R. vietnamensis. [8]

Key threats

The Yangtze giant softshell turtle faces numerous threats that have contributed to its critically endangered status. Habitat loss due to urbanization, pollution, and dam construction has drastically reduced its natural range. Illegal wildlife trade and a lack of robust legislation to regulate hunting and trafficking have further compounded the species' decline. [27]

The species has also suffered from overexploitation, as turtles are hunted for food, subsistence, and local consumption. Additionally, their carapaces and bones are used in traditional medicine, and their skulls are sometimes kept as trophies. [10]

A recent plan to construct a series of 12 hydropower dams along the Red River in China poses a significant risk, as it would flood critical habitats and alter the ecosystem downstream in Vietnam. [28]

Conservation efforts

External image
Searchtool.svg One individual in Suzhou Zoo, 2008. [29]

Captive breeding

Conservationists have focused on captive breeding as a primary strategy to save the Yangtze giant softshell turtle. In 2008, the last known fertile female, housed at the Changsha Zoo, was transferred to the Suzhou Zoo to breed with the sole known male in captivity. Despite six breeding seasons and numerous eggs laid, no viable offspring were produced. [22]

In 2015, artificial insemination was attempted for the first time. Although the procedure successfully fertilized eggs, none hatched. The female died in April 2019 after another artificial insemination attempt. [12] [13]

To improve future breeding outcomes, conservationists have focused on better habitat conditions and dietary adjustments to increase calcium levels, which are believed to influence egg viability. [30]

Wild population monitoring In parallel with captive breeding, efforts to locate wild individuals have intensified. Surveys in Vietnam's Dong Mo and Xuan Khanh Lakes have identified potential survivors, though their numbers remain critically low. Conservationists continue to explore other areas, such as the Red River in Yunnan Province, for remaining specimens. [31]

Surveys for surviving specimens

Conservationists have undertaken extensive efforts to locate wild Yangtze giant softshell turtles in the remote regions of China and Vietnam. Key areas of focus include parts of the Red River in Yunnan Province, where locals have reported sightings of large softshell turtles that match the species' description. However, these reports remain unconfirmed despite intensive surveys. [32]

In 2018, DNA analysis of water samples from Xuan Khanh Lake in Vietnam confirmed the presence of Rafetus swinhoei, marking the identification of a second wild individual. Additional surveys in Dong Mo Lake revealed the existence of two turtles, including one identified as a female in 2020. However, this female died in 2023, leaving the number of known surviving individuals critically low. [14] [15]

Despite setbacks, local conservation teams, supported by international organizations, continue to monitor these lakes and interview local communities to gather more information about potential surviving individuals. Efforts are also underway to explore new areas of habitat that could support this species. [33]

Rediscovered individuals

In recent years, conservationists have confirmed the existence of several wild individuals of the Yangtze giant softshell turtle in Vietnam.

In 2018, DNA analysis of water samples from Xuan Khanh Lake verified the presence of Rafetus swinhoei, confirming a second wild individual. Previously, this turtle had been photographed in 2012 and 2017, but the images were too blurry to provide conclusive identification. [34]

In November 2018, surveys in Dong Mo Lake revealed the existence of a second turtle alongside the individual already known to inhabit the area. The two turtles were first observed together during the summer of 2018, and further monitoring confirmed one of them was female. This marked the discovery of the first confirmed female since the death of the last captive female in 2019. [35]

Unfortunately, the female discovered in Dong Mo Lake died in early 2023 from unknown causes. [15]

In addition to these verified sightings, local fishermen in Yunnan Province have reported observing large softshell turtles in reservoirs created by the Madushan Dam. However, extensive surveys conducted in 2016 and 2017 failed to locate any surviving individuals in these areas. [36]

Other anecdotal reports suggest that a Rafetus swinhoei lived in a pond in Laos for over 45 years but disappeared after a monsoon in 2013. While promising, these accounts have yet to be substantiated. [37]

Here’s a rephrased version of the legend of Kim Qui section with improved flow and adherence to Wikipedia syntax:

The legend of Kim Qui

Depiction of Kim Qui receiving the Heaven's Will sword (Hoan Kiem). Kim Qui and the Restored Sword (Hoan Kiem) in ceramics.jpg
Depiction of Kim Qui receiving the Heaven's Will sword (Hoan Kiem).

The Yangtze giant softshell turtle has deep cultural significance in Vietnamese folklore, where it is associated with the legendary figure Kim Qui, or the Golden Turtle God ({{wikt:金|金}}{{wikt:龜|龜}}). Kim Qui is said to have appeared at pivotal moments in Vietnam's history, offering guidance and assistance to its rulers.

During the reign of An Dương Vương (257–207 BCE), Kim Qui reportedly aided the king in constructing defenses for the ancient capital of Co Loa. According to legend, the Golden Turtle provided the king with a magical crossbow capable of firing arrows en masse to repel invaders. When An Dương Vương’s daughter betrayed him, Kim Qui warned the king of her treachery, leading to her execution and the king’s eventual suicide. [18]

In the 15th century, Kim Qui is said to have appeared to Lê Lợi, a Vietnamese nobleman and later emperor. Lê Lợi received the magical sword Heaven's Will from a fisherman and used it to lead a rebellion against the Chinese occupation. After defeating the invaders and establishing the Lê dynasty, Lê Lợi returned the sword to Kim Qui at Hoan Kiem Lake ("Lake of the Returned Sword"). According to legend, the Golden Turtle surfaced to claim the sword, catching it in its jaws before disappearing into the depths of the lake. [18]

This legend has cemented the Yangtze giant softshell turtle as a symbol of resilience and cultural heritage in Vietnam, linking it to themes of national unity and divine intervention.

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References

  1. ↑ Fong, J.; Hoang, H.; Kuchling, G.; Li, P.; McCormack, T.; Rao, D.-Q.; Timmins, R.J.; Wang, L. (2022). "Yangtze Giant Softshell Turtle, Rafetus swinhoei ". IUCN Red List of Threatened Species . 2022. Retrieved 22 October 2022.
  2. ↑ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ↑ Fritz, Uwe; Havaš, Peter (2007). "Checklist of Chelonians of the World". Vertebrate Zoology. 57 (2): 321–322. doi: 10.3897/vz.57.e30895 . ISSN   1864-5755.
  4. ↑ "Almost Extinct Turtle Discovered Living In Wild In Northern Vietnam". ScienceDaily. Retrieved 2014-06-16.
  5. ↑ Dudgeon D (2010). "Requiem for a river: extinctions, climate change and the last of the Yangtze". Aquatic Conservation: Marine and Freshwater Ecosystems20 (2): 127-131.
  6. ↑ "World's Largest Freshwater Turtle Nearly Extinct". National Geographic. 2013-07-01. Archived from the original on July 7, 2013. Retrieved 2014-07-22.
  7. ↑ Jian W, Hai-Tao S, Cheng W, Lian-Xian H (2013). "Habitat Selection and Conservation Suggestions for the Yangtze Giant Softshell Turtle (Rafetus swinhoei ) in the Upper Red River, China". Chelonian Conservation and Biology12 (1): 177-184.
  8. 1 2 Farkas, Balázs; Minh Duc Le; Truong Quang Nguyen (2011). "Rafetus vietnamensis Le, Le, Tran, Phan, Phan, Tran, Pham, Nguyen, Nong, Phan, Dinh, Truong and Ha, 2010 – another invalid name for an invalid species of softshell turtle (Reptilia: Testudines: Trionychidae)". Russian Journal of Herpetology. 18 (1): 65–72. Retrieved 17 February 2012.
  9. ↑ Farkas B, Webb RG (2003). "Rafetus leloii Hà Dinh Dúc, 2000—an invalid species of softshell turtle from Hoan Kiem Lake, Hanoi, Vietnam (Reptilia, Testudines, Trionychidae)". Zoologische Abhandlungen. 53: 107–112.
  10. 1 2 3 "Species: Rafetus swinhoei ". Asian Turtle Conservation Network. Archived from the original on 2006-12-14. Retrieved 2006-12-09.
  11. 1 2 Carrington, Damian (January 2021). "Hopes for most endangered turtle after discovery of female in Vietnam lake". The Guardian. Retrieved 7 May 2022.
  12. 1 2 3 "苏州动物园一只斑鳖人工受精后死亡，世界目前已知的仅剩三只" (in Chinese). Sohu.com. 2019-04-13. Retrieved 2019-04-14.
  13. 1 2 3 "'Last female' of rare turtle species dies in China zoo". Al Jazeera English. 2019-04-14. Retrieved 2019-04-14.
  14. 1 2 "World's Most Endangered Turtle Gets Some Good News In 2020". newsroom.wcs.org. Retrieved 2020-12-19.
  15. 1 2 3 4 5 "Rare, Revered Reptile on Brink of Extinction After Last Female Dies". Time. 2023-04-28. Retrieved 2023-05-06.
  16. ↑ "Thế giới còn bao nhiêu cá thể rùa Hoàn Kiếm?". Báo điện tử Tiền Phong (in Vietnamese). 2023-04-24. Retrieved 2023-04-25.
  17. ↑ "Draft Action Plan – Rafetus swinhoei " (PDF). Turtle Survival Alliance. Archived from the original (PDF) on June 21, 2007. Retrieved 2006-12-09.
  18. 1 2 3 "Hoan Kiem Lake Turtle: from myth to reality". VietNamNet Bridge. 2005. Archived from the original on 2006-12-07. Retrieved 2006-12-09.
  19. ↑ "Vietnam hauls in beloved turtle for medical treatment". BBC. 2011-04-03. Retrieved 2011-04-03.
  20. ↑ Cu Rua: Vietnam mourns revered Hanoi turtle, BBC News, 20 January 2016
  21. ↑ "Relocation of endangered Chinese turtle may save species". Newswise. Retrieved on June 30, 2008.
  22. 1 2 "World's Largest Freshwater Turtle Nearly Extinct". News.nationalgeographic.com. 2013-07-01. Archived from the original on July 7, 2013. Retrieved 2014-06-16.
  23. ↑ "First Artificial Breeding Attempt for World's Rarest Turtle Unsuccessful". 2015-07-22.
  24. ↑ "New individual of world's rarest turtle found in Hanoi" . Retrieved 2018-04-16.
  25. ↑ Gray, John Edward (1873). "Notes on Chinese Mud-Tortoises (Trionychidae), with the Description of a new Species sent to the British Museum by Mr. Swinhoe, and Observations on the Male Organ of this Family". Annals and Magazine of Natural History. 12: 156–161. Retrieved 2023-01-16.
  26. ↑ "Rafetus swinhoei ". In: Fritz, Uwe; Havaš, Peter (2007). Checklist of Chelonians of the World Archived 2011-06-23 at the Wayback Machine , p. 182.
  27. ↑ Al-Asif, Abdulla; Hossain, Amir; Baruah, Chittaranjan; Abu Hena, Mustafa Kamal; Sharma, D.K.; Hamli, Hadi; Zaman, Md. Farid Uz (31 December 2022). "A ray of hope in the darkness: What we have learned from Yangtze giant soft-shell turtle Rafetus swinhoei (Gray, 1873) conservation?". Asian Journal of Conservation Biology. 11 (2): 167–168. doi: 10.53562/ajcb.EN00022 .
  28. ↑ "红河干流梯级综合规划报告通过评审". Yunnan Channel, Xinhua Net. 2003-04-04. Archived from the original on 2009-02-12. Retrieved 2008-09-10.
  29. ↑ "Rare elderly turtles fail to produce offspring". NBC News. 2008. Retrieved 2023-12-21.
  30. ↑ "Workshop on Rafetus Conservation in the Honghe (Red River) Drainage Area". Asian Turtle Conservation Network. 2008-05-30. Retrieved 2008-09-10.
  31. ↑ "The Yangtze Softshell Turtle – TURTLE ISLAND". 2019-04-18. Archived from the original on 2019-04-18. Retrieved 2023-11-08.
  32. ↑ "There Are Only 3 of These Turtles Left on Earth". 2017-05-23. Archived from the original on May 23, 2017. Retrieved 2017-06-02.
  33. ↑ "More than one individual of Swinhoe's Softshell Turtle living in Dong Mo Lake?". www.asianturtleprogram.org. Retrieved 2019-04-15.
  34. ↑ "Population of world's rarest giant turtle rises to 4 with new discovery". news.mongabay.com. 2018-04-13. Retrieved 2018-04-16.
  35. ↑ "More than one individual of Swinhoe's Softshell Turtle living in Dong Mo Lake?". www.asianturtleprogram.org. Retrieved 2019-04-15.
  36. ↑ "The hunt for the Madushan Monster". www.chinadialogue.net. 26 June 2017. Retrieved 2019-04-18.
  37. ↑ "The Yangtze Softshell Turtle – TURTLE ISLAND". 2019-04-18. Archived from the original on 2019-04-18. Retrieved 2023-11-08.

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