Evaluation of organochlorine contamination in Indo-Pacific humpback dolphins (Sousa chinensis) from the Pearl River Estuary, China

Wu, Yinglin; Shi, Jingchun; Zheng, Gene J.; Li, Ping; Liang, Bo; Chen, Tufeng; Wu, Yuping; Liu, Wenhua

doi:10.1016/j.scitotenv.2012.11.110

Cited by 33 publications

(11 citation statements)

References 36 publications

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“…DDT residues in individual dolphins refl ected the proximity of their habitat to agricultural and industrial releases of DDT. Wu et al ( 2013 ) reported levels of DDT ranging from 0.845 to 179 ppm (with a mean of 64.2 ppm) in blubber from Indo-Pacifi c humpback dolphins ( Sousa chinensis ) stranded in [2004][2005][2006][2007][2008][2009] in the Pearl River Delta in China. Seventy fi ve percent of the DDT residue was p , p ′-DDT, suggesting fresh releases of DDT.…”

Section: Ddt In Marine Mammalsmentioning

confidence: 99%

DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health

Byard¹,

Paulsen

Tjeerdema

et al. 2014

Reviews of Environmental Contamination and Toxicology Volume 235

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Section: Ddt In Marine Mammalsmentioning

confidence: 99%

DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health

Byard¹,

Paulsen

Tjeerdema

et al. 2014

Reviews of Environmental Contamination and Toxicology Volume 235

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“…Contamination by Hg(II) and MeHg was also observed in surface water in the tributary (e.g., Dong River) of the Pearl River Delta. However, THg and MeHg contamination in Indo-Pacific humpback dolphins and the interaction between THg toxicity and Se accumulation in their bodies have not been systematically studied in this ecosystem [10] , [11] .…”

Section: Introductionmentioning

confidence: 99%

Mercury and Selenium in Stranded Indo-Pacific Humpback Dolphins and Implications for Their Trophic Transfer in Food Chains

Gui¹,

Yong³

et al. 2014

PLoS ONE

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As top predators in the Pearl River Estuary (PRE) of China, Indo-Pacific humpback dolphins (Sousa chinensis) are bioindicators for examining regional trends of environmental contaminants in the PRE. We examined samples from stranded S. chinensis in the PRE, collected since 2004, to study the distribution and fate of total mercury (THg), methylmercury (MeHg) and selenium (Se) in the major tissues, in individuals at different ages and their prey fishes from the PRE. This study also investigated the potential protective effects of Se against the toxicities of accumulated THg. Dolphin livers contained the highest concentrations of THg (32.34±58.98 µg g−1 dw) and Se (15.16±3.66 µg g−1 dw), which were significantly different from those found in kidneys and muscles, whereas the highest residue of MeHg (1.02±1.11 µg g−1 dw) was found in dolphin muscles. Concentrations of both THg and MeHg in the liver, kidney and muscle of dolphins showed a significantly positive correlation with age. The biomagnification factors (BMFs) of inorganic mercury (Hginorg) in dolphin livers (350×) and MeHg in muscles (18.7×) through the prey fishes were the highest among all three dolphin tissues, whereas the BMFs of Se were much lower in all dolphin tissues. The lower proportion of MeHg in THg and higher Se/THg ratios in tissues were demonstrated. Our studies suggested that S. chinensis might have the potential to detoxify Hg via the demethylation of MeHg and the formation of tiemannite (HgSe) in the liver and kidney. The lower threshold of hepatic THg concentrations for the equimolar accumulation of Se and Hg in S. chinensis suggests that this species has a greater sensitivity to THg concentrations than is found in striped dolphins and Dall’s porpoises.

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“…River-associated and coastal pollution is the other side of the coin (Jenssen 2003;Sun et al 2012). Accumulation of organochlorine compounds (DDTs, PCBs and HCB) , polycyclic aromatic hydrocarbons (PAHs) and heavy metals ( Hg, Pb et al) in humpback dolphins was discovered in many distribution areas (Cagnazzi et al 2013;Hung et al 2006a;Hung et al 2006b;Wu et al 2013) , that challenges conservation of the estuary-type dolphins. Variables describing topological features of the seafloor such as slope, aspect and surf_ratio were not good predictors for the dolphin habitats.…”

Section: Habitat Preferencementioning

confidence: 99%

Modeling potential distribution of Indo-Pacific humpback dolphins (Sousa chinensis) in the Beibu Gulf, China

Chen

Song

Qin

2016

Preprint

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Evaluation of organochlorine contamination in Indo-Pacific humpback dolphins (Sousa chinensis) from the Pearl River Estuary, China

Cited by 33 publications

References 36 publications

DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health

DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health

Mercury and Selenium in Stranded Indo-Pacific Humpback Dolphins and Implications for Their Trophic Transfer in Food Chains

Modeling potential distribution of Indo-Pacific humpback dolphins (Sousa chinensis) in the Beibu Gulf, China

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