Distribution and bioaccumulation of microcystins in water columns: A systematic investigation into the environmental fate and the risks associated with microcystins in Meiliang Bay, Lake Taihu

Song, Lirong; Chen, Wei; Peng, Liang; Wan, Neng; Gan, Nanqin; Zhang, Xiaoming

doi:10.1016/j.watres.2007.02.013

Cited by 233 publications

(158 citation statements)

References 39 publications

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“…Interestingly, although the abundance of Microcystis was relatively high in Dianchi Lake (> 1.0 × 10 9 cells/L), the cellbound and extracellular MC concentrations were significant lower than the MC concentrations in raw drinking water samples from Taihu Lake and Chaohu Lake in China (Peng, 2012;Zheng et al, 2004;Song et al, 2007;Xu et al, 2008aXu et al, , 2008b. Although our research indicated that MC was correlated positively with WT, pH and DO, the MC concentrations could be probably associated with Microcystis morphospecies and colony size in Dianchi Lake.…”

Section: Explanation Of the Dynamics Of Extracellular MC Concentrationsmentioning

confidence: 99%

Seasonal dynamics of water bloom-forming Microcystis morphospecies and the associated extracellular microcystin concentrations in large, shallow, eutrophic Dianchi Lake

Лин

Gan

et al. 2014

Journal of Environmental Sciences

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Section: Explanation Of the Dynamics Of Extracellular MC Concentrationsmentioning

confidence: 99%

Seasonal dynamics of water bloom-forming Microcystis morphospecies and the associated extracellular microcystin concentrations in large, shallow, eutrophic Dianchi Lake

Лин

Gan

et al. 2014

Journal of Environmental Sciences

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“…2003; Song et al. 2007), the species may be of conservation concern; yet, formal evaluations of the status of the species have not been performed in this area. Further, the species may be affected by the strong fragmentation of Chinese river systems by damming in the last century (Nilsson et al.…”

Section: Introductionmentioning

confidence: 99%

Population genetic structure of Bellamya aeruginosa (Mollusca: Gastropoda: Viviparidae) in China: weak divergence across large geographic distances

Husemann

Ding

et al. 2015

Ecology and Evolution

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Bellamya aeruginosa is a widely distributed Chinese freshwater snail that is heavily harvested, and its natural habitats are under severe threat due to fragmentation and loss. We were interested whether the large geographic distances between populations and habitat fragmentation have led to population differentiation and reduced genetic diversity in the species. To estimate the genetic diversity and population structure of B. aeruginosa, 277 individuals from 12 populations throughout its distribution range across China were sampled: two populations were sampled from the Yellow River system, eight populations from the Yangtze River system, and two populations from isolated plateau lakes. We used seven microsatellite loci and mitochondrial cytochrome oxidase I sequences to estimate population genetic parameters and test for demographic fluctuations. Our results showed that (1) the genetic diversity of B. aeruginosa was high for both markers in most of the studied populations and effective population sizes appear to be large, (2) only very low and mostly nonsignificant levels of genetic differentiation existed among the 12 populations, gene flow was generally high, and (3) relatively weak geographic structure was detected despite large geographic distances between populations. Further, no isolation by linear or stream distance was found among populations within the Yangtze River system and no signs of population bottlenecks were detected. Gene flow occurred even between far distant populations, possibly as a result of passive dispersal during flooding events, zoochoric dispersal, and/or anthropogenic translocations explaining the lack of stronger differentiation across large geographic distances. The high genetic diversity of B. aeruginosa and the weak population differentiation are likely the results of strong gene flow facilitated by passive dispersal and large population sizes suggesting that the species currently is not of conservation concern.

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“…2). In general, dissolved MCLR concentration in eutrophic lakes is less than or close to 0.01 mg/L (Song et al 2007;Lee et al 2015); these dissolved toxins may not evidently affect snails. Indeed cell-bound MCs in water should be considered because snails in fields are simultaneously exposed to dissolved and cell-bound MCs.…”

Section: Discussionmentioning

confidence: 93%

“…MCs are synthesized intracellularly and enter the surrounding water after cell lysis and death (Watanabe et al 1992) or via an active release process (Robillot et al 2000). Dissolved MC concentrations in natural water range from tens of nanograms to several micrograms per liter (Bogialli et al 2006;Song et al 2007) because MCs are mainly retained in healthy cyanobacterial cells. However, high concentration (several milligrams per liter) of MCs in the water can occur when massive numbers of toxic cyanobacterial cells collapse and decay.…”

Section: Introductionmentioning

confidence: 99%

Oxidative stress responses and toxin accumulation in the freshwater snail Radix swinhoei (Gastropoda, Pulmonata) exposed to microcystin-LR

Zhang

Xie

Wang

2015

Environ Sci Pollut Res

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Microcystin-LR (MCLR) is one of the most common toxins in eutrophic freshwater ecosystems. The ecotoxicological effects of MCLR in freshwater ecosystems have been widely documented; however, the physiological effects of MCLR on freshwater snails and the underlying toxicity/ detoxification mechanisms have not been well investigated. In this laboratory study, antioxidant system responses in the hepatopancreas and the digestive tract of Radix swinhoei, a typical freshwater snail, exposed to 0.01 mg/L to 2 mg/L MCLR were explored. Antioxidant enzymes, particularly superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD), in the digestive tracts were effectively generated at 0.2 and 2 mg/L MCLR. However, SOD and CAT activities in the hepatopancreas were activated only at 0.2 mg/L MCLR. Glutathione (GSH) concentrations in the digestive tracts significantly increased at 0.01 to 0.2 mg/L MCLR; by comparison, GSH concentrations in the hepatopancreas remained stable. No oxidative damage (lipid peroxidations) occurred in the digestive tracts and the hepatopancreas when the snail was exposed to ≤0.2 mg/L MCLR. MCLR accumulation in different snail tissues was also examined. MCLR accumulated in different tissues and showed the following pattern: hepatopancreas>gonads>digestive tracts>muscles. Bioaccumulated concentrations in these four tissues increased as MCLR exposure concentrations increased; by contrast, bioaccumulation factors decreased as MCLR exposure concentrations increased. Our results indicated that R. swinhoei is sensitively responsive to MCLR by changing antioxidant system status to cope with the toxicity. Snails may be vectors of MCs that transfer MCs in eutrophic lakes via food chains or food web.

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Distribution and bioaccumulation of microcystins in water columns: A systematic investigation into the environmental fate and the risks associated with microcystins in Meiliang Bay, Lake Taihu

Cited by 233 publications

References 39 publications

Seasonal dynamics of water bloom-forming Microcystis morphospecies and the associated extracellular microcystin concentrations in large, shallow, eutrophic Dianchi Lake

Seasonal dynamics of water bloom-forming Microcystis morphospecies and the associated extracellular microcystin concentrations in large, shallow, eutrophic Dianchi Lake

Population genetic structure of Bellamya aeruginosa (Mollusca: Gastropoda: Viviparidae) in China: weak divergence across large geographic distances

Oxidative stress responses and toxin accumulation in the freshwater snail Radix swinhoei (Gastropoda, Pulmonata) exposed to microcystin-LR

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