Loading...

A Retrospective Analysis on the Population Viability of the Yangtze River Dolphin or Baiji (Lipotes vexillifer)

DOI: 10.18805/ijar.B-1238    | Article Id: B-1238 | Page : 775-779
Citation :- A Retrospective Analysis on the Population Viability of the Yangtze River Dolphin or Baiji (Lipotes vexillifer).Indian Journal of Animal Research.2022.(56):775-779
Wu Bin, Wang Weiping, Wang Haihua, He Gang wubinjx@163.com
Address : Fisheries Research Institute of Jiangxi Province, Scientific Observing and Experimental Station of Fishery Resources and Environment in Poyang Lake, Ministry of Agriculture, 330000 Nanchang, China.
Submitted Date : 1-01-2020
Accepted Date : 24-04-2020

Abstract

Background: Lipotes vexillifer,  is a functionally extinct species of freshwater dolphin commonly called as Baiji dolphin of Yanzte River, China. The dolphin is thought to be the first one of it’s kind driven to extinction due to the impact of humans. Yangtze Freshwater Dolphin Expedition carried out in the year 2006 revealed the species as functionally extinct. The présent study deals with the population viability analysis of the baiji dolphin using Vortex software and also by consulting historical materials and relevant literature to explore the possible causes of the functional extinction of the baiji in the Yangtze River. The findings are to provide guidance for the effective management of another freshwater mammal, the Yangtze finless porpoise.
Methods: Population viability analysis of the baiji dolphin for various parameters were assessed using Vortex software and other published information and relevant literatures. The analysis were carried out to ascertain the possible causes of the functional extinction of the baiji in the Yangtze River.
Result: Simulation models were employed to identify the reasons for extinction of Yangtze River baiji population by adopting viability retrospective method. The various parameters associated with the population analysis were included to derive logical conclusion. The minimum viable population of the Yangtze River baiji was also identified by adopting various simulation models. The present study is the first attempt to apply the 10,000-time iteration method to the baiji population survivability analysis.

Keywords

Lipotes vexillifer PVA Vortex model MVP Habitat

References

  1. Brook B, Burgman M, Frankham R. (2000a). Differences and congruencies between PVA packages: the importance of sex ratio for predictions of extinction risk. Conservation Ecology. 4(1): 920.
  2. Brook BW, O’grady JJ, Chapman AP, et al. (2000b). Predictive accuracy of population viability analysis in conservation biology. Nature. 404(6776): 385-387.
  3. Chen P, Hua Y. (1989). Distribution, population size and protection of Lipotes vexillifer. In Biology and Conservation of the River Dolphins. Occasional Paper of the IUCN Species Survival Commission (SSC), Vol. 3, Perrin WF, Brownell RL, Zhou K, Liu J (eds). 81-85.
  4. Chen P, Liu P, Liu R, et al. (1980). Distribution, ecology, behavior and protection of the dolphin in the middle reaches of the Changjiang River (Wuhan-Yueyang). Oceanologica Limnologia Sinica. 11: 73-84.
  5. Chen P, X Zhang, D Wang. (1992). Conservation of the endangered baiji, Lipotes vexilifer, China. In: Procecdings of 23rd Annual IAAAM Conference, Hong Kong: 2-10.
  6. Chen P, Zhang X, Wei Z, et al. (1993). Appraisal of the influence upon baiji, Lipotes vexillifer by the Three-gorge Project and conservation strategy. Acta Hydrobiologica Sinica. 17: 101-111.
  7. Curtis HF, Gregory DH, Steven R, et al. (2011). Minimum viable populations: is there a ‘magic number’ for conservation practitioners? Trends in Ecology and Evolution. 26(6): 307-316.
  8. Dalton, R. (2006). Last hope for river dolphins. Nature. 440:1096-1097.
  9. Gayanilo, FC, Sparre, P, Pauly, D. (1996). FAO-ICLARM stock assessment tools (FiSAT). User’s guide. FAO Computerized Information Series (Fisheries). No. 8, Rome, FAO. 126 p. 
  10. Gayanilo, FC, Sparre, P, Pauly, D. (2005). FAO-ICLARM stock assessment tool II (FiSAT II) User’s guide. FAO, Rome, 168 pp.
  11. Gayanilo, FC., Pauly, D. (1997). FAO-ICLARM stock assessment tools (FiSAT). Reference manual. FAO Computerized Information Series (Fisheries). No. 8, Rome, FAO. 262 p. 
  12. Hacer Y. (2018). Estimating some population parameters and stock assesment of spiny butterfly ray, Gymnura altavela (Linnaeus, 1758) the Levant Basin coast (Northeastern Mediterranean). Indian J. Anim. Res. 52(12): 1790-1796.
  13. Hu, BZ. (2003). The national treasure in water, Lipotes vexillifer. Wild Anim. 5: 29-31.
  14. Huang, J, Mei ZG, Chen M, et al. (2019). Population survey showing hope for population recovery of the critically endangered Yangtze finless. Biological Conservation, (on line).https://doi.org/10.1016/j.biocon.
  15. Lacy RC, Borbat M, Pollak JP. (2009). Vortex: A stochastic simulation of the extinction process. Version 9.95. Chicago Zoological Society. Brookfield, Illinois.
  16. Lancy RC. (1993). VORTEX: a computer simulation model for population viability analysis. Wild Research pending revision. 
  17. Lin K, Chen P, Hua Y. (1985). Population size and conservation of baiji, Lipotes vexillifer. Acta Ecologica Sinica, China. 5: 77-85.
  18. Mei ZG, Huang SL, Hao Y J, et al. (2012). Accelerating population decline of Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis). Biological Conservation. 153: 192-200.
  19. Mei ZG, Zhang XQ, Huang SL, et al. (2014). The yangtze finless porpoise: on an accelerating path to extinction?. Biological Conservation. 172:117-123.
  20. Population status and conservation issues in the Yangtze River, China. Aquatic Conserv: Mar. Freshw. Ecosyst. 13: 51-64.
  21. Ralls K, Ballou JD, Templeton A. (1988). Estimates of Lethal Equivalents and the Cost of Inbreeding in Mammals. Conservation Biology. 2: 185-193. 
  22. Reed DH, O’Grady J J, Brook B W, et al. (2003). Estimates of minimum viable population sizes for vertebrates and factors influencing those estimates. Biological Conservation. 113(1): 23-34.
  23. Reeves RR, Leatherwood S. (1994). 1994-1998 Action Plan for the Conservation of Cetaceans. Dolphins, Porpoises and Whales. IUCN: Gland.
  24. Reeves RR, Smith BD, Kasuya T. (2000). Biology and Conservation of Freshwater Cetaceans in Asia. IUCN: Gland. 
  25. Turvey, ST, Pitman, RL, Taylor, BL et al. (2007). “First human-caused extinction of a cetacean species,” Biol. Lett.3. 537-540.
  26. Wang, D, Wang, K, Akamatsu, T et al.(1999). Study on whistles of the Chinese river dolphin or baiji “Lipotes vexillifer”. Oceano-logia et Limnologia Sinica. 30: 349-354.
  27. Wei, Z, Wang, D, Kuang, X, et al. (2002). “Observations on behavior and ecology of the Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) group at Tian-e-Zhou Oxbow of the Yangtze River,” The Raffles Bulletin of Zoology, Supplement. 10: 97-103.
  28. Wu Bin, Wang Haihua, Fu Huiyun, Zhang Yanping. (2018). Estimating some population parameters and stock assessment of Dark Sleeper Odontobutis potamophila in the Gaosha River, Wuyuan County, Jiangxi Province. Indian J. Anim. Res. 52(5): 664-668.
  29. Zhang X, Wang D, Liu R, et al. (2003). TheYangtze River dolphin or baiji (Lipotes vexillifer).
  30. Zhang XF, Wang D, Wang KX. (1994). VORTEX model and its application on the Management of Chinese River Dolphin (Lipotes vexilifer) population. Chinese Biodiversity. 2(3): 133-139.
  31. Zhang XF, Wang D, Wang KX. (1999). Population viability analysis for the Yangtze finless porpoise. Acta Ecologica Sinica, China. 19(4): 529-533.
  32. Zhou K, Li Y, Nishiwaki M, Kataoka T. (1982). A brief report on observations of the baiji, Lipotes vexillifer, in the lower reaches of the Yangtze River between Nanjing and Guichi. Acta Theriologica Sinica. 2: 253-254.
  33. Zhou K, Pilleri G, Li Y. (1980). Observations on baiji (Lipotes vexillifer) and finless porpoise (Neophocaena asiaeorientalis) in the lower reaches of the Chang Jiang. Scientia Sinica. 23: 785-795.
  34. Zhou, XM, Guang, XM, Sun, D, et al. (2018). Population genomics of finless porpoises reveal an incipient cetacean species adapted to freshwater [J]. Nature Communications. 9:1276.

Global Footprints