Ganges River DolphinBulletin of the Ecological Society of America (2016)
Ganges River dolphins live in different river systems of Bangladesh—both inland and estuaries. A case study was carried out in the Buriganga River from December 2012 to November 2013. The river is under intense anthropogenic pressures caused by urban occupation of the surrounding areas and by the use of the water body. Also, water pollution, human intervention, and water traffic were observed to be the major threats for dolphins. In the meantime, a total of 34 sightings of dolphins were recorded both in individuals and in groups. The mean density was 0.38 (SD ± 0.37) dolphins/km² with the highest density of dolphin observed also in the month of November, which was 1.14 dolphins/km². We encountered the dolphins at the rate of 0.48 dolphins/km in the river. So we need to conserve Buriganga river ecology which can save the river dolphin.
But day by day dolphin mortality increases in Bangladesh. Here, habitat loss due to river and floodplain encroachment and lack of fish fauna during December to May, coupled with pollution, urges our attention to immediate conservation. Dolphins are listed as endangered in Bangladesh by the International Union for Conservation of Nature due to human intervention, illegal development, and water pollution. Without an immediate and concerted conservation effort, river dolphins will almost certainly become extinct locally and perhaps nationally in the near future. Additionally, Sonadia Island is known for its importance as a habitat of globally threatened shorebirds such as critically endangered spoon-billed sandpipers and endangered Nordmann's greenshanks and great knots. The Department of Zoology at Jagannath University in Dhaka, Bangladesh, has been working on Sonadia to save these species since 2014. Sonadia Island is a part of the Moheskhali upazila (district) located between 21°28′26.92″N; 91°55′53.74″E and 21°32′49.47″N 91°50′38.45″E. During these studies, researchers observed the deaths of several Ganges River dolphins. This has not yet been studied but deserves special attention.
Publication DateWinter April 1, 2016
Citation InformationHossain, Md.Muzammel., Alam, S. M. I., Baki, M. A. and Bhouiyan, N. A. (2016), Ganges River Dolphin. Bull Ecol Soc Am, 97: 183–187. doi:10.1002/bes2.1227