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Other than poaching, what are the possible reasons for the decline in the population of Gangas River Dolphins ?
1. Construction of dams and barrages on rivers
2. Increase in the population of crocodiles in rivers.
3. Getting trapped in fishing nets accidentally
4. Use of synthetic fertilizers and other agricultural chemicals in crop-fields in the vicinity of rivers
Select the correct answer using the code given below.
1 and 2 only
2 and 3 only
1, 3 and 4 only
1, 2, 3 and 4
The Ganges River Dolphin is found in the Ganges-Brahmaputra-Meghna and Karnaphuli-Sangu rivers of India and Bangladesh. The population of the Ganges River Dolphin has declined to less than 1,800 from 6,000 in 1982 due to construction of dams and water pollution caused by pesticides, fertilizers, and industrial effluents.
Crocodile population has nothing to do with the decline in population of dolphins.
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