Other than poaching, what are the possible reasons for the decline in the population of Ganges 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.

QUESTION

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Environment & Ecology

Prelims 2014

Other than poaching, what are the possible reasons for the decline in the population of Ganges River Dolphins?

Construction of dams and barrages on rivers
Increase in the population of crocodiles in rivers
Getting trapped in fishing nets accidentally
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.

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Explanation

Construction of dams and barrages This is a major threat. Dams fragment the river habitat, hinder migration patterns, and can disrupt prey availability for the dolphins.

Increase in crocodile population While competition might exist, it's not a cause of decline. A healthy river ecosystem can support both dolphins and crocodiles.

Accidental entanglement in fishing nets This is a significant threat, as dolphins can get caught in fishing gear and drown.

Agricultural chemicals Runoff from agricultural lands can pollute rivers with pesticides and fertilizers. These pollutants can harm the dolphins' health and prey species.

Thus 1,3 and 4 are the cause of decline in the Ganga River Dolphins.

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