Skip to main content
WCS
Menu
Library
Library Catalog
eJournals & eBooks
WCS Research
Archives
Research Use
Finding Aids
Digital Collections
WCS History
WCS Research
Research Publications
Science Data
Services for WCS Researchers
Archives Shop
Bronx Zoo
Department of Tropical Research
Browse By Product
About Us
FAQs
Intern or Volunteer
Staff
Donate
Search WCS.org
Search
search
Popular Search Terms
WCS History
Library and Archives
Library and Archives Menu
Library
Archives
WCS Research
Archives Shop
About Us
Donate
en
fr
Title
Chapter Title: Susu and Bhulan: Platanista gangetica gangetica and P. g. minor
Book Title: Encyclopedia of Marine Mammals.
Author(s)
Smith, Brian D. ;Braulik, Gillian T;.
Published
2017
Abstract
Susu Platanista gangetica gangetica and bhulan Platanista gangetica minor are two river dolphin subspecies that are the sole surviving members of a primitive and once widespread taxon of archaic cetaceans. These dolphins have a slightly awkward appearance with an especially long snout particularly in adult females, broad flippers, a tiny dorsal fin appearing as a hump, and an extremely small eye visible as only a pin-like hole. They exhibit specialized adaptations to a riverine environment including a flexible neck for highly maneuverable swimming, a specialized projection on the skull to focus echolocation signals for chasing individual prey, side-swimming behavior where the dolphins sweep their head back and forth in a scanning motion while trailing one flipper along the bottom, and severely reduced optic nerves and absence of a focusing lens since vision is of little value in the generally turbid waters that characterize their habitat. Both subspecies are endangered due to water development, including dams and embankments, which have degraded their habitat and fragmented populations, as well as from fatal entanglements in fishing gears, especially gill nets. These threats are particularly acute for both subspecies due to their general occurrence in countercurrent pools that are eliminated or reduced in size in channels affected by water development and are the primary fishing grounds for local communities.
Keywords
Asian river dolphin;Indian river dolphin;Ganges river dolphin;Brahmaputra river dolphin;almost blind
Access Full Text
A full-text copy of this article may be available. Please email the
WCS Library
to request.
Back
PUB22845