The natural flow of water and fertile sediments from Indus river into the delta has been impeded due to the construction of dams along the river . The reduction of freshwater due to the dams also increases salinity , making the waters of the delta unsuitable for the freshwater species . In case of the Indus dolphin , the damming of the river has isolated the delta dolphin population from those dolphins upstream . The 2010 Pakistan floods were considered " good news " for the ecosystem of the river delta as they brought an excess of much needed fresh water . The Sindh government announced that 8,000 hectares of mangrove forests had been planted , and more plantation was considered ( however , the delta has lost 170,000 hectares of mangroves over the past 50 years )
2010 Pakistan floods
2010 Pakistan floods
Indus River Delta