Publications

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trace metal pollution in hong kong: implications for the health of hong kong's indo-pacific hump-backed dolphins (sousa chinensis).the territorial waters of hong kong are highly contaminated with anthropogenic pollutants, including trace metals. hong kong's population of indo-pacific hump-backed dolphins (sousa chinensis) inhabits an area where a high volume of sewage waste discharge and the close proximity of contaminated mud pits mean a considerable potential for trace metal contamination. trace metal concentrations in the muscle tissue of fish caught from areas of high dolphin abundance are notable. however, in order to ...19989646525
post-mortem investigations on stranded dolphins and porpoises from hong kong waters.stranded cetaceans reported from the territorial waters of hong kong during the period may 1993 to march 1998 were examined to establish factors that may have contributed to their death. during the current study, 28 indo-pacific hump-backed dolphins (sousa chinensis), 32 finless porpoises (neophocaena phocaenoides), and four bottlenose dolphins (tursiops truncatus) were necropsied. bacteria (15 species) were isolated from nine animals. of these bacteria, 47% were of possible fecal origin reflect ...200010813617
development of an air bubble curtain to reduce underwater noise of percussive piling.underwater bubbles can inhibit sound transmission through water due to density mismatch and concomitant reflection and absorption of sound waves. for the present study, a perforated rubber hose was used to produce a bubble curtain, or screen, around pile-driving activity in 6-8-m depth waters of western hong kong. the percussive hammer blow sounds of the pile driver were measured on 2 days at distances of 250, 500, and 1000 m; broadband pulse levels were reduced by 3-5 db by the bubble curtain. ...200011444016
parasites from indo-pacific hump-backed dolphins (sousa chinensis) and finless porpoises (neophocaena phocaenoides) stranded in hong kong.between 1993 and 1998, 28 indo-pacific hump-backed dolphins (sousa chinensis) and 32 finless porpoises (neophocaena phocoenoides) stranded in hong kong territorial waters were examined postmortem for parasites. the nematode halocercus pingi was discovered in the lungs of one hump-backed dolphin and in 10 finless porpoises, typically within abscesses or granulomata, and they were frequently accompanied by a catarrhal exudate and lesions characteristic of pneumonia. seven of the 10 finless porpois ...200111465264
underwater sounds near a fuel receiving facility in western hong kong: relevance to dolphins.western hong kong is home to two species of marine mammals: indo-pacific humpbacked dolphins (sousa chinensis) and finless porpoises (neophocaena phocaenoides). both are threatened in many parts of their range in southeast asia [for example, international biological research institute reports 9 (1997), 41; asian marine biology 14 (1997) 111]. in 1998, when the new hong kong international airport opened in western hong kong, small tankers (about 100 m long, cargo capacity about 6300 metric tons) ...200212206406
behavioral response of indo-pacific humpback dolphin (sousa chinensis) to vessel traffic.a series of land-based surveys were conducted at two vantage points of known dolphin abundance in hong kong. the purpose of this study was to determine the behavioral response of indo-pacific humpback dolphin (sousa chinensis) to vessel traffic. results indicated that dolphins dove for a longer duration in areas of heavy vessel traffic or when there was the presence of an oncoming vessel. dependent upon the type of vessel and the relative distance, dolphins might flee, continue their ongoing act ...200312927738
a preliminary risk assessment of trace elements accumulated in fish to the indo-pacific humpback dolphin (sousa chinensis) in the northwestern waters of hong kong.in order to assess the potential risks associated with consumption of contaminated prey items to the indo-pacific humpback dolphin (sousa chinensis), fish species (collichthys lucida, pseudosciaena crocea, johnius sp., thryssa sp., mugil sp. and trichiurus sp.) representing the main food items of the dolphin were collected from the northwestern waters of hong kong, including the sha chau and lung kwu chau marine park, which form the main habitat of the dolphin in hong kong. within these waters, ...200415234160
sounds of indo-pacific humpback dolphins (sousa chinensis) in west hong kong: a preliminary description.vocalizations of indo-pacific humpback dolphins (sousa chinensis) in west hong kong waters were described from 12 recordings in 2010. a broadband hydrophone system recorded sounds. vocalizations were characterized as broadband click trains, burst pulses, and narrowband frequency modulated sounds, including whistles generally similar to those of some other delphinid cetaceans. a comparison of results to previous humpback dolphin sound descriptions for moreton bay, australia found broad similariti ...201222280729
humpback dolphins in hong kong and the pearl river delta: status, threats and conservation challenges.in coastal waters of the pearl river delta (prd) region, the indo-pacific humpback dolphin (sousa chinensis) is thought to number approximately 2500 individuals. given these figures, the putative prd population may appear strong enough to resist demographic stochasticity and environmental pressures. however, living in close proximity to the world's busiest seaport/airport and several densely populated urban centres with major coastal infrastructural developments comes with challenges to the long ...201626790887
the behavioural ecology of indo-pacific humpback dolphins in hong kong.fewer than 200 indo-pacific humpback dolphins (sousa chinensis) occur in hong kong waters (though these are part of a much larger population in the pearl river estuary), with a decrease in the past about 10 years. they have partially overlapping individual ranges (mean=100km(2)), and two partially overlapping communities. seasonal occurrence is higher in june-november than december-may, approximate wet and dry monsoon seasons, respectively. group sizes tend to average three dolphins, a decrease ...201626790888
indo-pacific humpback dolphins (sousa chinensis) in hong kong: modelling demographic parameters with mark-recapture techniques.indo-pacific humpback dolphins (sousa chinensis) inhabiting hong kong waters are thought to be among the world's most anthropogenically impacted coastal delphinids. we have conducted a 5-year (2010-2014) photo-id study and performed the first in this region comprehensive mark-recapture analysis applying a suite of open population models and robust design models. cormack-jolly-seber (cjs) models suggested a significant transient effect and seasonal variation in apparent survival probabilities as ...201728355228
temporal trends and pattern changes of short- and medium-chain chlorinated paraffins in marine mammals from the south china sea over the past decade.temporal trends of short- (sccps) and medium-chain chlorinated paraffins (mccps) were examined in blubber samples of 50 finless porpoises (neophocaena phocaenoides) and 25 indo-pacific humpback dolphins (sousa chinensis) collected from the south china sea between 2004 and 2014. elevated levels of sccps and mccps were detected in all blubber samples of both cetacean species. concentrations of sccps ranged from 280 to 3900 ng·g(-1) dry weight (dw) in porpoises and from 430 to 9100 ng·g(-1) dw in d ...201526335162
temporal trends of hexabromocyclododecanes (hbcds) and polybrominated diphenyl ethers (pbdes) and detection of two novel flame retardants in marine mammals from hong kong, south china.concentrations of hexabromocyclododecanes (hbcds), polybrominated diphenyl ethers (pbdes), and three novel flame retardants, namely2-ethylhexyl 2,3,4,5-tetrabromobenzoate (tbb), bis-(2-ethylhexyl)-tetrabromophthalate (tbph), and hexachlorocyclopentadienyldibromocyclooctane (hcdbco), were determined in blubber samples of indo-pacific humpback dolphins (sousa chinensis) and finless porpoises (neophocaena phocaenoides). the levels of hbcds and pbdes in cetacean samples ranged from 4.1 to 519 and 10 ...200919806725
risk assessment of trace elements in the stomach contents of indo-pacific humpback dolphins and finless porpoises in hong kong waters.the potential health risks due to inorganic substances, mainly metals, was evaluated for the two resident marine mammals in hong kong, the indo-pacific humpback dolphin (sousa chinensis) and the finless porpoise (neophocaena phocaenoides). the stomachs from the carcasses of twelve stranded dolphins and fifteen stranded porpoises were collected and the contents examined. concentrations of thirteen trace elements (ag, as, cd, co, cr, cs, cu, hg, mn, ni, se, v and zn) were determined by inductively ...200716979696
a preliminary risk assessment of organochlorines accumulated in fish to the indo-pacific humpback dolphin (sousa chinensis) in the northwestern waters of hong kong.the indo-pacific humpback dolphin is considered threatened due to several factors including pollution in hong kong and the risks due to consumption of fish tainted with polychlorinated biphenyls (pcbs) and organochlorine pesticides were assessed. six species of fish collichthys lucida, pseudosciaena crocea, johnius sp., thryssa sp., mugil sp. and trichiurus sp., which comprise the main prey species of humpback dolphins were collected for analyses. risks due to total pcbs, total teqs, pcb 118 and ...200616516360
polybrominated diphenyl ethers (pbdes) and organochlorines in small cetaceans from hong kong waters: levels, profiles and distribution.polybrominated diphenyl ethers (pbdes) and organochlorine compounds (ocs) were determined in the blubber, liver and kidney of indo-pacific humpback dolphins (sousa chinensis) and finless porpoises (neophocaena phocaenoides) stranded in hong kong coastal waters during 1995-2001. among the organohalogen compounds analyzed, ddts were the most dominant contaminants with concentrations ranging from 9.9 to 470 microg/g lipid wt. pbdes in hong kong cetaceans, which are reported for the first time, were ...200516291183
an assessment of the risks associated with polychlorinated biphenyls found in the stomach contents of stranded indo-pacific humpback dolphins (sousa chinensis) and finless porpoises (neophocaena phocaenoides) from hong kong waters.the risks to indo-pacific humpback dolphins and finless porpoises associated with polychlorinated biphenyls (pcbs) were assessed. stomach contents from twelve stranded humpback dolphins and sixteen stranded finless porpoises were collected. concentrations of total and isomer-specific pcbs in the stomach contents were determined using dual-column gas chromatography equipped with electron capture detectors (gc-ecd). risks due to the pcbs were assessed in three scenarios, based on total pcbs (summa ...200616169043
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