The National Red List Project

NRLD - 327633 | Tursiops aduncus

Assessment ID
327633
Taxon name
Tursiops aduncus
(Ehrenberg, 1833)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Tursiops aduncus
(Ehrenberg, 1833)
Common name(s)
Indo-pacific Bottlenose Dolphin, Indian Ocean Bottlenose Dolphin, Botolnaak Samudrik Shishu or Dolphin
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Mammals
Kingdom
Animalia
Phylum
chordata
Class
mammalia
Order
cetacea
Family
delphinidae
Genus
Tursiops
Species
aduncus
Species authority
(Ehrenberg, 1833)
Taxonomic notes and synonyms listed
Based on concordance in genetics, osteology, and external morphology, Tursiops aduncus is reported as taxonomically distinct (Wang et al. 1999, 2000 a, b).
Location and scope
Specific locality or subnational name or regional name
Bangladesh
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Bangladesh
Country ISO code(s)
BGD
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Assessed as
Near Threatened
Abbreviated status
NT
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
A population of 2,239 individuals of Tursiops aduncus has been estimated by Mansur et al. 2011 in the northern tip of Swatch of No-ground in the Bay of Bengal and there were also few sightings recorded outside of Swtach of No ground in the Bay of Bengal. Both the Extent of Occurrence and Area of Occupancy were much larger than the thresholds level of threatened categories. Moreover, no decline in the species population was found. Thus, it has been categorized as Least Concern.
Assessment details
Year assessed
2015
Assessors/contributors/reviewers listed
Md. Zahangir Alom
Criteria system used
IUCN
Reference for methods given
IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge, UK: IUCN. iv + 32pp; IUCN (2012) Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp.
URL (link) of redlist assessment or publication
http://iucnredlistbd.org/
Further information
Endemism (according to assessment)
Endemic to region
No
Taxon distribution as listed in assessment
The distribution of Tursiops aduncus is patchy, widespread along the eastern coast of Africa, through the Red Sea and Persian Gulf, eastwards as far as Taiwan and southeastward to coastal waters of Australia (Curry and Smith 1997, Möller and Beheregaray 2001, Wells and Scott 2002, Culik 2011). It is restricted to the Swatch of No-ground, offshore and near shore marine habitats in the Bay of Bengal.
Is there a map available in assessment?
Yes, in the publication/on website
Habitat and systems
Ecological system type
Terrestrial
Not_assigned
Freshwater
Not_assigned
Marine
Not_assigned
Habitat
Habitat details as listed in assessment
This dolphin inhabits coastal, pelagic and marine waters of the Bay of Bengal. Very social and occurred up to 200 animals in one group. Forage over reefs or soft bottom substrata and near the shore. It moves from coastal water to the deep marine water and vice versa. Mostly breeds during December to March.
History
Not assessed (IUCN Bangladesh 2000).
Publication
Red List of Bangladesh Volume 2: Mammals
IUCN Bangladesh. 2015. Red List of Bangladesh Volume 2: Mammals. IUCN, International Union for Conservation of Nature, Bangladesh Country Office, Dhaka, Bangladesh, pp. xvi+232