Stenella attenuata | Red List of Bangladesh Volume 2: Mammals

Taxa
Stenella attenuata | (Gray, 1846)
Publication
Red List of Bangladesh Volume 2: Mammals
NRL Record ID
327630
Location
Countries in Assessment
Bangladesh
Country ISO code(s)
BGD
Does the assessment cover a marine EEZ area(s)?
Off
Scope (Assessment)
National
Taxon
RRL Synonyms
Stenella graffmani Lönnberg, 1934
Taxonomic Group
Vertebrates
Taxonomic Group Level 2
Mammals
Assessed taxon level
Species
Taxonomic Notes
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).
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.
Habitats and Ecology
Ecological system type
Terrestrial system
No
Freshwater system
No
Marine system
No
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.
Is there a map available in assessment?
Yes, in the publication/on website
Assessed status
Asessment status in full
Least Concern
Assessment status abreviation
LC
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.
About the assessment
Assessment year
2015
Assessors/contributors/reviewers listed
Md. Zahangir Alom
Affliation of assessor(s)/contributors/reviewers listed on assessment
NGO
Academic
Assessor affiliation specific
Academic|NGO
Criteria system
Criteria system specifics
IUCN v3.1 + Regional Guidelines v4.0
Criteria system used
IUCN
Criteria Citation
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/
Endemism
Endemic to region
No
Endemism Notes
Is an endemic?: No
Conservation
Conservation Measures

Conservation measures:
Conservation measures notes:
Required conservation measures:

Further information
History
Not assessed yet (IUCN Bangladesh 2000).
Scientific Name Kingdom Phylum Class Order Family Genus
Stenella attenuata Animalia Chordata Mammalia Cetartiodactyla Delphinidae Stenella