The National Red List Project

NRLD - 327630 | Stenella attenuata

Assessment ID
327630
Taxon name
Stenella attenuata
(Gray, 1846)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Stenella attenuata
(Gray, 1846)
Common name(s)
Pantropical Spotted Dolphin, Bridled Dolphin, Narrow-snouted Dolphin, Chitra Samudrik Shishu or Dolphin, Futki Dolphin
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Mammals
Kingdom
Animalia
Phylum
chordata
Class
mammalia
Order
cetacea
Family
delphinidae
Genus
Stenella
Species
attenuata
Species authority
(Gray, 1846)
Taxonomic notes and synonyms listed
There are two subspecies of Stenella ateenuata recognized: S. a. attenuata distributed worldwide in the oceanic tropical waters, and S. a. graffmani distributed widely in the waters of eastern tropical Pacific coast (Perrin 2002).
Stenella graffmani Lönnberg, 1934
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
Least Concern
Abbreviated status
LC
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
Not much is known about the distribution and population size of Stenella attenuata in Bangladesh. A large group of about 800 individuals were in the far offshore of the southeast coast was reported by Smith et al. (2008) and eight sightings with mean group size of 137 individuals (range=20-350) were recorded in the Swatch of No-ground by BCDP (2008). This study does not cover the whole area of the Bay of Bengal, so this implies that significant number of population may occur further offshore in unsurveyed area. The Extent of Occurrence and the Area of Occupancy are much larger than the thresholds level of the threatened categories. Moreover, it is not believed to be facing any critical threat in the marine waters of Bangladesh (BCDP 2008). Thus, the species has been assessed 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
It occurs in tropical and warm temperate waters of the Indian, Pacific and Atlantic Oceans (Culik 2011, Hammond et al. 2012). It lives in Swatch of No-Ground, pelagic and marine habitats with high salinity in the offshore waters of 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
It inhabits Swatch of No-Ground and offshore marine waters. It is very social and forms large school of up to 800 individuals. This dolphin is often found in close association with Spinner Dolphin Stenella longirostris.
History
Not assessed yet (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