Distribution and group dynamics of Indo-Pacific humpback dolphins (Sousa chinensis) in the western Pearl River Estuary, China

Chen, Tao; Qiu, Yongsong; Jia, Xiaoping; Hung, Samuel K.; Liu, Wenhua

doi:10.1016/j.mambio.2010.01.001

Cited by 33 publications

(34 citation statements)

References 10 publications

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“…In Hong Kong waters, it appears to occur anywhere where there is a riverine influence, but does not occur in a strictly-marine environment (Jefferson 2000). There is no large estuary around the sighting area, however, with these new sightings in an area generally shallower than 20 m, which is similar to those previously recorded in Hong Kong and surrounding waters (Jefferson and Karczmarski 2001;Chen et al 2011), it confirms a preference of these dolphins in shallow waters. Although fish catch and species components in the present surveyed area were not yet quantitatively investigated, shoals of small fish were frequently observed during the surveys.…”

Section: Discussionsupporting

confidence: 86%

First record of the Indo-Pacific humpback dolphins (Sousa chinensis) southwest of Hainan Island, China

Lin

et al. 2016

Mar Biodivers Rec

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Background: Populations of Indo-Pacific humpback dolphins (Sousa chinensis) in China were known to be distributed from the Beibu Gulf near the border with Vietnam to the mouth of the Yangtze River. According to existing studies, the waters around Hainan Island, China, were not considered to be part of the humpback dolphins' distribution. Results: In 2014, for the first time, we recorded humpback dolphins in waters southwest of Hainan Island.

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Section: Discussionsupporting

confidence: 86%

First record of the Indo-Pacific humpback dolphins (Sousa chinensis) southwest of Hainan Island, China

Lin

et al. 2016

Mar Biodivers Rec

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“…Karczmarski et al 2000;Chen T et al 2011;Dares et al 2014). Certainly, sightings of S. plumbea, S. chinensis and S. sahulensis are generally restricted to shallow waters of ≤26 m (Karczmarski et al 2000;Parsons 2004;Stensland et al 2006;Wang et al 2007;Brown et al 2012), and all sightings of S. teuszii reported to date are also well within this range.…”

Section: Discussionmentioning

confidence: 92%

“…Karczmarski et al 2000;Stensland et al 2006;Wang et al 2007), whereas elsewhere they also occur several kilometres from land (e.g. Corkeron et al 1997;Parsons 2004;Chen T et al 2011;Brown et al 2012). Water depth is a component of 'nearshore' as defined by Davidson-Arnott and Greenwood (2003) and is likely to be one of several interrelated parameters influencing the distribution of Sousa species.…”

Section: Discussionmentioning

confidence: 99%

Photo-identification and habitat use of Atlantic humpback dolphinsSousa teusziiaround the Río Nuñez Estuary in Guinea, West Africa

Weir

2015

African Journal of Marine Science

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Ecological data for the Atlantic humpback dolphin Sousa teuszii are scant. Six on-effort Sousa teuszii sightings were recorded during 817.6 km of boat-based effort in the Río Nuñez region of Guinea during October and November 2013. Two incidental sightings were also reported. Groups comprised 1-25 animals. Photo-identification produced a minimum population estimate of 47 animals. Most sightings (n = 5) were located close (<1 km) to shore along a 5.7 km stretch of coast on the west side of Île de Taïdi, primarily over shallow, sand-mud habitat. Two very distinctive individuals were present in all four Taïdi photo-identification encounters, suggesting high site fidelity and stable associations. Two sightings occurred in the outer Río Nuñez Estuary much farther from the coast (5-12 km) but in relatively shallow water (≤15 m) over sand-mud sediment. Focal follows (n = 5: 0.2-3.8 h duration) produced 9.02 h of behavioural data. Travel (51%), foraging (39%) and feeding (9.2%) dominated, with Taïdi dolphins spending more time foraging and feeding than the outer estuary groups. Three individuals had linear-severed dorsal fins consistent with injuries from fishing line. Some management implications of variation in habitat, site fidelity and movements of Sousa teuszii groups are discussed.

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“…This is the case for the Indo-Pacific humpback dolphins (Sousa chinensis) which predominantly inhabit areas with water depths shallower than 20 m (Chen et al, 2011). However, before we can answer the above questions, we must know what types of echolocation signals each odontocete species produces under various environmental conditions, or alternatively, record the same species (preferably the same individuals) under different environment conditions.…”

Section: Introductionmentioning

confidence: 99%

Echolocation signals of free-ranging Indo-Pacific humpback dolphins (Sousa chinensis) in Sanniang Bay, China

Fang

Wang

et al. 2015

The Journal of the Acoustical Society of America

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While the low-frequency communication sounds of Indo-Pacific humpback dolphins (Sousa chinensis) have been reported in a number of papers, the high-frequency echolocation signals of Sousa chinensis, especially those living in the wild, have been less studied. In the current study, echolocation signals of humpback dolphins were recorded in Sanniang Bay, Guangxi Province, China, using a cross-type hydrophone array with five elements. In total, 77 candidate on-axis clicks from 77 scans were selected for analysis. The results showed that the varied peak-to-peak source levels ranged from 177.1 to 207.3 dB, with an average of 187.7 dB re: 1 lPa. The mean peak frequency was 109.0 kHz with a À3-dB bandwidth of 50.3 kHz and 95% energy duration of 22 ls. The À3-dB bandwidth was much broader than the root mean square bandwidth and exhibited a bimodal distribution. The center frequency exhibited a positive relationship with the peak-to-peak source level. The clicks of the wild Indo-Pacific humpback dolphins were short-duration, broadband, ultrasonic pulses, similar to those produced by other whistling dolphins of similar body size. However, the click source levels of the Indo-Pacific humpback dolphin appear to be lower than those of other whistling dolphins.

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Distribution and group dynamics of Indo-Pacific humpback dolphins (Sousa chinensis) in the western Pearl River Estuary, China

Cited by 33 publications

References 10 publications

First record of the Indo-Pacific humpback dolphins (Sousa chinensis) southwest of Hainan Island, China

First record of the Indo-Pacific humpback dolphins (Sousa chinensis) southwest of Hainan Island, China

Photo-identification and habitat use of Atlantic humpback dolphinsSousa teusziiaround the Río Nuñez Estuary in Guinea, West Africa

Echolocation signals of free-ranging Indo-Pacific humpback dolphins (Sousa chinensis) in Sanniang Bay, China

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