Abstract
Populations of endangered Ganges and Indus river dolphins have been under severe threat from diversion of river water by dams, barrages, and canal networks across the Indus and Ganges–Brahmaputra river basins. River dolphins prefer deep water and might enter irrigation canals in the dry-season, getting stranded there. Stranding can cause mortality and local population declines, and poses an emerging challenge to river dolphin conservation efforts. In Pakistan’s Indus river basin, stranding rates of Indus dolphins in irrigation canals are high, and well-coordinated rescue-release operations are undertaken. Despite commendable river dolphin rescue efforts in some parts of India, stranding cases are not always reported. From open-access media reports (2007–08 to 2017–18), I found 26 stranding cases of Ganges river dolphins from the Ghaghara–Sharada canal network across seven districts of Uttar Pradesh, India. Of these, 62% reports were from 2015 to 2016. Most cases occurred in secondary and tertiary canal branches. Interviews with fishers, farmers, and government officials revealed low awareness of stranding cases. Stranded dolphins might have no chance of returning to their source habitat, unless rescued. From my results, I discuss how current barrage-canal operations could influence dolphin stranding risk, and their implications for flow management in the Ghaghara–Sharada river basin.
Acknowledgments: I am thankful to my M.Sc. supervisor Dr. Salil Dhawan, DCF & Course Coordinator M.Sc. Program, Forest Research Institute, and co-supervisor Dr. Shailendra Singh, Country Director-Turtle Survival Alliance, for their vital inputs to my thesis, on which this paper is based. Researchers and staff of the Forest Research Institute-Dehradun and the Turtle Survival Alliance-Lucknow provided basic administrative and field support. I thank Mr. S.K. Upadhyay, IFS, the Principal Chief Conservator of Forests of the Uttar Pradesh Forest Department, and the Office of the Engineer-in-Chief & HOD, Irrigation and Water Resources Department, Lucknow, UP, for providing research permissions for my fieldwork and for the canal survey of river dolphins I undertook. In particular I would like to thank Mr. S.K. Srivastav (Executive Engineer, IDUP-Shardanagar) and Mr. V. Yadav (Junior Engineer) of Sharada barrage for their kind inputs on the basic working of the canal system, field accommodation, and logistical support. I thank my field assistant Mr. Ram Swarup and the Turtle Survival Alliance, without whom this work would not have been possible. I would like to thank the anonymous reviewers and editors of Mammalia who improved this manuscript substantially.
Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The study was self-funded.
Conflict of interest statement: No potential conflict of interest is reported by the author.
References
Basu, D. (2012). The abundance and distribution of the Ganges river dolphin, Susu, in the Geruwa and Ghagra rivers of Uttar Pradesh, India. Report by WWF-India & The Uttar Pradesh Forest Department, India, pp. x+42.Search in Google Scholar
Behera, S.K., Singh, H., and Sagar, V. (2013). Status of Ganges river dolphin (Platanista gangetica gangetica) in the Ganga river basin, India: a review. Aquat. Ecosys. Health Manag. 16: 425–432, https://doi.org/10.1080/14634988.2013.845069.Search in Google Scholar
Behera, S.K., Singh, H., Sagar, V., and De, R. (2014). Current status of Ganges river dolphin Platanista gangetica gangetica in the rivers of Uttar Pradesh, India. In: Rivers for Life. Proceedings of the international symposium on river biodiversity: Ganges-Brahmaputra-Meghna river systems. IUCN, Patna, India, pp. 139–149.Search in Google Scholar
Braulik, G.T., Arshad, M., Noureen, U., and Northridge, S.P. (2014). Habitat fragmentation and species extirpation in freshwater ecosystems: causes of range decline of the Indus river dolphin (Platanista gangetica minor). PLoS One 9: e101657, https://doi.org/10.1371/journal.pone.0101657.Search in Google Scholar
Braulik, G.T., Uzma, N., Masood, A., and Reeves, R.R. (2015). Review of status, threats, and conservation management options for the endangered Indus river blind dolphin. Biol. Conserv. 192: 30–41, https://doi.org/10.1016/j.biocon.2015.09.008.Search in Google Scholar
Choudhary, S.K., Dey, S., Dey, S., Sagar, V., Nair, T., and Kelkar, N. (2012). River dolphin distribution in regulated river systems: implications for dry-season flow regimes in the Gangetic basin. Aquat. Conserv. Mar. Freshw. Ecosyst. 22: 11–25, https://doi.org/10.1002/aqc.1240.Search in Google Scholar
India-WRIS (2012). River basin atlas of India. RRSC-West, NRSC, ISRO, Jodhpur, India.Search in Google Scholar
Javed, R.M. and Khan, B.N. (2005). Saving river dolphin: report of an in situ conservation project of Lahore Zoo carried out in association with Sindh wildlife department, Vol. 6. Zoos’ Print, Pakistan, pp. 9–11.Search in Google Scholar
Khanal, G., Suryawanshi, K.R., Awasthi, K.D., Dhakal, M., Subedi, N., Nath, D., Kandel, R.C., and Kelkar, N. (2016). Irrigation demands aggravate fishing threats to river dolphins in Nepal. Biol. Conserv. 204B: 386–393, https://doi.org/10.1016/j.biocon.2016.10.026.Search in Google Scholar
National Institute of Hydrology (NIH-Roorkee) (2013). Morphological study of the Ghaghara River. Final Report: Submitted to Morphology Directorate. Central Water Commission, New Delhi, India, p. 89.Search in Google Scholar
Paudel, S., Timilsina, Y.P., Lewis, J., Ingersoll, T., and Jnawali, S.R. (2015). Population status and habitat occupancy of endangered river dolphins in the Karnali river system of Nepal during the low water season. Mar. Mamm. Sci. 31: 707–719, https://doi.org/10.1111/mms.12192.Search in Google Scholar
Prajapati, S. (2018). A study on straying incidences of Gangetic dolphins (Platanista gangetica gangetica) into irrigation canals along Ghaghara-Sarju river system, MSc thesis. Forest Research Institute, Dehradun, India.Search in Google Scholar
Programme Evaluation Organisation (PEO) (2007). Evaluation study of Sarda Sahayak Pariyojana. Report 198. Planning Commission Government of India, New Delhi. p. 108.Search in Google Scholar
QGIS Development Team (2018). QGIS geographic information system. Open source geospatial foundation project, https://qgis.osgeo.org.Search in Google Scholar
Ram, R. (1993). Agricultural development: command area approach. Abhinav: 356.Search in Google Scholar
Reeves, R.R. and Chaudhry, A.A. (1998). Status of the Indus river dolphin Platanista minor. Oryx 32: 35–44, https://doi.org/10.1046/j.1365-3008.1998.00016.x.Search in Google Scholar
Reeves, R.R. and Smith, B.D. (1999). Interrupted migrations and dispersal of river dolphins: some ecological effects of riverine development. In: Proceedings of the CMS symposium on animal migration (Gland, Switzerland, 13 April 1997), UNEP/CMS. CMS Technical Series Publication No. 2., Bonn/The Hague, pp. 9–18.Search in Google Scholar
Reeves, R.R., Smith, B.D., and Kasuya, T. (2000). Biology and conservation of freshwater cetaceans in Asia. IUCN, Gland, Switzerland and Cambridge, UK, pp. viii+152.Search in Google Scholar
Sinha, R.K. (2000). Status of Ganges river dolphin, Platanista gangetica, in the vicinity of Farakka barrage. In: Reeves, R.R., Smith, B.D., and Kasuya, T. (Eds.). Biology and conservation of freshwater cetaceans in Asia, IUCN Species Survival Commission Occasional Paper No. 23. IUCN, Gland, Switzerland and Cambridge, UK, pp. viii+152.Search in Google Scholar
Sinha, R.K. and Kannan, K. (2014). Ganges river dolphin: an overview of biology, ecology, and conservation status in India. Ambio 43: 1029–1046, https://doi.org/10.1007/s13280-014-0534-7.Search in Google Scholar
Smith, A.M. and Smith, B.D. (1998). Review of status and threats to river cetaceans and recommendations for their conservation. Environ. Rev. 6: 189–206, https://doi.org/10.1139/a99-002.Search in Google Scholar
Smith, B.D. (1993). 1990 status and conservation of the Ganges river dolphins (Platanista gangetica) in Karnali river, Nepal. Biol. Conserv. 66: 159–169, https://doi.org/10.1016/0006-3207(93)90002-i.Search in Google Scholar
Smith, B.D. and Reeves, R.R. (2000). Survey methods for population assessment of Asian river dolphins. In: Reeves, R.R., Smith, B.D., and Kasuya, T. (Eds.). Biology and conservation of freshwater cetaceans in Asia, IUCN Species Survival Commission Occasional Paper No. 23. IUCN, Gland, Switzerland and Cambridge, UK, pp. viii+152.Search in Google Scholar
Smith, B.D. and Reeves, R.R. (2012). River cetaceans and habitat change: generalist resilience or specialist vulnerability? J. Marine Biol. 11: 718935, https://doi.org/10.1155/2012/718935.Search in Google Scholar
Smith, B.D., Sinha, R.K., Regmi, U., and Sapkota, K. (1994). Status of Ganges river dolphins (Platanista gangetica) in the Karnali, Mahakali, Narayani and Sapta Kosi rivers of Nepal and India in 1993. Mar. Mamm. Sci. 10: 368–375, https://doi.org/10.1111/j.1748-7692.1994.tb00492.x.Search in Google Scholar
Smith, B.D., Aminul Haque, A.K.M., Shakhawat, H.M., and Khan, A. (1998). River dolphins in Bangladesh: conservation and the effects of water development. Environ. Manag. 22: 323–335, https://doi.org/10.1007/s002679900108.Search in Google Scholar PubMed
Smith, B.D., Sinha, R.K., Zhou, K., Chaudhry, A.A., Liu, R., Wang, D., Ahmed, B., Aminul Haque, A.K.M., Lal Mohan, R.S., and Sapkota, K. (2000). Register of water development projects affecting river cetaceans in Asia. In: Reeves, R.R, Smith, B.D., and Kasuya, T. (Eds.). Biology and conservation of freshwater cetaceans in Asia, IUCN Species Survival Commission Occasional Paper No. 23. IUCN, Gland, Switzerland and Cambridge, UK, pp. viii+152.Search in Google Scholar
Smith, B.D., Ahmed, B., Ali, M.E., and Braulik, G. (2001). Status of the Ganges river dolphin or shushuk Platanista gangetica in Kaptai Lake and the southern rivers of Bangladesh. Oryx 35: 61–72, https://doi.org/10.1017/s0030605300031549.Search in Google Scholar
Sunita, Prabhat, P., Dinkar, G.K. (2015). Forecasting model of flood inundated areas along Sharada river in U.P. IOSR J. Appl. Geol. Geophys. 3: 1–11.Search in Google Scholar
Toosy, A.H., Khan, U., Mahmood, R., and Bhagat, H.B. (2009). First tagging with a radio-transmitter of a rescued Indus river dolphin near Sukkur Barrage, Pakistan. Wildlife Middle East 3: 6.Search in Google Scholar
Waqas, U., Malik, M.I., and Khokhar, L.A. (2012). Conservation of the Indus river dolphin (Platanista gangetica minor) in the Indus river system, Pakistan: an overview. Rec. Zool. Surv. Pak. 21: 82–85.Search in Google Scholar
Supplementary material
The online version of this article offers supplementary material (https://doi.org/10.1515/mammalia-2019-0110).
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