Records of Indo-Pacific Humpback Dolphins (&lt;I&gt;Sousa chinensis&lt;/I&gt;, Osbeck, 1765) Along the Coasts of India and Sri Lanka: An Overview

Sutaria, Dipani; Jefferson, Thomas A.

doi:10.1578/am.30.1.2004.125

Cited by 35 publications

(32 citation statements)

References 10 publications

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“…This often results from a slightly different spatial interpretation of *Information in the literature on the extent of variation among these putative forms is at present incomplete, and, therefore, our classification here should be considered somewhat tentative. #While there is evidence that both the plumbea and chinensis forms of the humpback dolphin occur in India (see Sutaria & Jefferson, 2004), there was little external morphological data available to assign skulls to specific forms. Most of the skulls came from the west coast of India, where apparently only the plumbea form occurs.…”

Section: Methodsmentioning

confidence: 99%

Geographic Variation in Skull Morphology of Humpback Dolphins (<I>Sousa </I> spp.)

Jefferson¹,

Waerebeek²

2004

aquatic mammals

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The taxonomy and systematic relationships of humpback dolphins (genus Sousa) are highly confused. This is largely due to a lack of data and samples from large portions of the range of the genus, and confusing and seemingly contradictory patterns of variation in available external morphometric, skeletal morphometric, and molecular datasets. To help clarify the situation, we measured 222 skulls of humpback dolphins originating from throughout most regions of the range of Sousa. While patterns of cranial variation appeared to be relatively conservative, there was evidence for three groups: (1) Atlantic Ocean/ West Africa, (2) Western Indian Ocean, and (3) Eastern Indian Ocean/Pacific Ocean. These would appear to correspond to the teuszii, plumbea, and chinensis forms, respectively. No taxonomic revisions are recommended at this time, and the conservative view of two species (S. teuszii in West Africa and S. chinensis in the Indo-Pacific) can be defended for the time being as a pragmatic approach. The distinctness of S. teuszii is clearcut, but other taxonomic decisions should await further studies of molecular genetics and morphometrics, currently underway.

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Section: Methodsmentioning

confidence: 99%

Geographic Variation in Skull Morphology of Humpback Dolphins (<I>Sousa </I> spp.)

Jefferson¹,

Waerebeek²

2004

aquatic mammals

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“…The Indo-Pacific humpback dolphin (Sousa chinensis Osbeck, 1765), Irrawaddy dolphin (Orcaella brevirostris Owen in Gray, 1866), and Indo-Pacific finless porpoise (Neophocaena phocaenoides Cuvier, 1829) are among the three most common small coastal cetacean species found in Southeast Asia (Hines et al, 2015;Jutapruet, Intongcome, Wang, Kittiwattanawong, & Huang, 2017;Minton et al, 2013;Ponnampalam, 2012), and at the study site in Matang, Peninsular Malaysia (Kuit, Ponnampalam, Fairul Izmal, & Chong, 2014;Ponnampalam, 2013). The Indo-Pacific humpback dolphin (hereafter referred to as the humpback dolphin) is found in shallow coastal waters throughout China and Southeast Asia (Jefferson & Karczmarski, 2001;Jefferson, Smith, Braulik, & Perrin, 2017;Sutaria & Jefferson, 2004). The marine range of the Irrawaddy dolphin includes the nearshore and coastal waters of the Indo-Pacific region, stretching from north-eastern India to east Kalimantan in Southeast Asia (Smith, 2018).…”

Section: Introductionmentioning

confidence: 99%

Distribution and habitat characteristics of three sympatric cetacean species in the coastal waters of Matang, Perak, Peninsular Malaysia

Kuit

Ponnampalam²,

Ng³

et al. 2019

Aquatic Conservation

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Coastal cetaceans in Southeast Asia are poorly studied and are particularly vulnerable to anthropogenic threats, especially in intensive fishing grounds. To investigate the distribution and habitat characteristics of cetaceans in the productive coastal waters of Matang, Perak, Malaysia, boat‐based line transect surveys were conducted between 2013 and 2016. The Irrawaddy dolphin (Orcaella brevirostris) was most frequently encountered at 3.87 sightings per 100 km, followed by the Indo‐Pacific finless porpoise (Neophocaena phocaenoides) at 1.72 sightings per 100 km, and the Indo‐Pacific humpback dolphin (Sousa chinensis) at 0.66 sightings per 100 km. The mean group size was largest for humpback dolphins (8.4 individuals), followed by Irrawaddy dolphins (6.4 individuals), and finless porpoises (2.8 individuals). Humpback dolphins exhibited a clustered distribution concentrated mainly in shallow estuarine waters (<10 m deep and <5 km from river mouths), whereas Irrawaddy dolphins were more widely distributed in farther coastal waters (<15 m deep and <15 km from river mouths), and finless porpoises were mostly found farthest from the shore in coastal waters (10–25 m deep and >15 km from river mouths). The spatial distribution of the three cetaceans overlapped minimally, and this is likely to reflect the distribution of preferred prey resources, species interactions, and their differential responses to anthropogenic activities and species dominance. The results from our study serve as baseline information for future research, conservation, and habitat management of these vulnerable and endangered coastal cetaceans. Conservation actions are recommended for the Matang area.

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“…We test the above mentioned issues of population structure in relation to environmental heterogeneity in the Indo-Pacific humpback dolphin (Sousa chinensis), which is distributed in the coastal waters of the Indian Ocean basin from South Africa to China and along the coasts of Australia (Karczmarski et al, 1999a;Jefferson and Karczmarski, 2001;Atkins et al, 2004;Hung and Jefferson, 2004;Parra et al, 2004;Sutaria and Jefferson, 2004;Wang et al, 2004;Amir et al, 2005). The taxonomy of the genus is largely unresolved and there are presently two recognized species, the Indo-Pacific and Atlantic (Sousa teuszii) humpback dolphins (Jefferson and Karczmarski, 2001).…”

Section: Introductionmentioning

confidence: 99%

Molecular ecology meets remote sensing: environmental drivers to population structure of humpback dolphins in the Western Indian Ocean

et al. 2011

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Records of Indo-Pacific Humpback Dolphins (<I>Sousa chinensis</I>, Osbeck, 1765) Along the Coasts of India and Sri Lanka: An Overview

Cited by 35 publications

References 10 publications

Geographic Variation in Skull Morphology of Humpback Dolphins (<I>Sousa </I> spp.)

Geographic Variation in Skull Morphology of Humpback Dolphins (<I>Sousa </I> spp.)

Distribution and habitat characteristics of three sympatric cetacean species in the coastal waters of Matang, Perak, Peninsular Malaysia

Molecular ecology meets remote sensing: environmental drivers to population structure of humpback dolphins in the Western Indian Ocean

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