World Land Trust's own species page states there are no range-wide estimates of abundance or population trends for Inia geoffrensis, only regional survey data; a 22-year standardized count in Brazil's Mamirauá Reserve documents a sustained decline, and Brazilian Amazon surveys separately estimate a 6.7 percent annual population decline, but no basin-wide census across the Amazon, Orinoco and Madeira systems has ever been completed.
What would resolve this A coordinated, standardized survey across the full range (Brazil, Peru, Ecuador, Colombia, Venezuela and Bolivia) using consistent transect methodology, of the kind already run locally in the Mamirauá Reserve, extended basin-wide and repeated on a regular interval.
OpenPopulation ecology / conservation biologyAmazon River Dolphin (World Land Trust)