Effect of eutrophication on molluscan community composition in the Lake Dianchi (China, Yunnan)

Du, Lei; Li, Yuan; Chen, Xiaoyong; Yang, Jing

doi:10.1016/j.limno.2010.09.006

Cited by 51 publications

(20 citation statements)

References 16 publications

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“…Weakly acidic sediment is deleterious to gastropod fecundity, hatching survival, and formation of calcareous shells and can lead to high mortality of embryos and low recruitment (Shaw andMackie 1989, Echeverría et al 2010). Although inconsistent with other research (Du et al 2011), in our study, the population structure of M. melanioides appeared to react negatively to DO. Harman and Berg (1971) reported that some prosobranchs can tolerate very low levels of water-column DO.…”

Section: Population Structure In Lake Dianchicontrasting

confidence: 99%

“…Mud, silt, and sand are the major sediment components across the whole lake. Human population in the area is increasing rapidly, causing the lake to suffer from high levels of nutrient loading (Du et al 2011). Extensive algal blooms have occurred year round for .20 y (Wu et al 1992, Li et al 2003, indicating the lake's hypereutrophic status.…”

Section: Study Areamentioning

confidence: 99%

“…However, conservation planning is a challenge, in part because of lack of knowledge regarding its reproductive strategy, agespecific survivorship, and general population ecology. Limited surveys of molluscan assemblages in the plateau lakes indicated that the population decline resulted partly from high levels of anoxia, low sexual reproduction, and changes in the substrate (Shu et al 2010, Wang et al 2011, Du et al 2011), but these data were mostly qualitative. To develop sufficient conservation strategies, systematic research is urgently needed on many facets of M. melanioides, including its biology, population ecology, and reproductive behavior.…”

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confidence: 99%

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Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

et al. 2013

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Abstract. The highly endemic diversity of the Yun-Gui plateau lakes has decreased severely in recent decades. Protecting these native species is a challenge, in part because their biology and population ecology remain unexplored. We investigated 1 focal endangered gastropod species (Margarya melanioides) in 1 plateau lake: 1) to quantify spatiotemporal variation in population abundance and size structure, and 2) to identify the key variables influencing these variations. Density was 0.068 individuals/m 2 with an estimated total population size of 2.1 3 10 7 individuals. The size-frequency distribution was skewed toward larger, mature individuals (40.0-60.0 mm), a result indicating that the population is aging. Population size structure showed high spatial heterogeneity, and density was highest in the north-central region of the lake. Redundancy analysis indicated that human-induced environmental degradation strongly controlled the spatial patterns in size-structure. This species has experienced a remarkable decrease in range and population size over the past 50 y, and the population probably will collapse by 2015. The decline could be attributed to demographic drift, environmental filtering, human harvesting, and its limited dispersal ability. Our studies should give useful information for building efficient conservation strategies for M. melanioides and other threatened plateau gastropods. Further studies are needed on the population ecology and reproductive biology of M. melanioides, particularly on its reproductive behavior and size-specific survivorship.

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Section: Population Structure In Lake Dianchicontrasting

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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confidence: 99%

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Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

et al. 2013

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“…The lake body is approximately 40 km long and 12.5 km at its widest point, with an average water depth of 4.7 m and an area of 292 km 2 . With the development of agriculture, industry, and urbanization in the region, increasing sewage discharge has altered the freshwater biodiversity structure (Du et al 2011).…”

Section: Study Areamentioning

confidence: 99%

Distribution of arsenic between the particulate and aqueous phases in surface water from three freshwater lakes in China

Yang

Geng

Wei

et al. 2015

Environ Sci Pollut Res

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Total arsenic (As) in suspended particulate matter (SPM) of lacustrine ecosystems has been extensively documented, but knowledge on the distribution of As between the particle and aqueous phases in freshwater lakes remains largely unknown. The present study employed a rapid method to determine the total and dissolved As and As in SPM at sites covering the entire areas of three large shallow lakes in China, e.g., Taihu, Chaohu, and Dianchi, to obtain a Brepresentativem ean value of the As concentration in various phases. The average concentrations of total and dissolved As were below 6.0 and 3.3 μg/L, respectively. Arsenic in SPM was much higher than that in waters, as ranging from 24.7 to 516 μg/g. Lake Taihu exhibited extensive seasonal variation both in total and dissolved As, while little difference was observed in SPM concentration, with an average value of 54.2 and 49.3 mg/L in winter and summer, respectively. Among the algae in the three lakes, Cyanophyta dominated in both cell abundance and biomass. Algae mass occupied significant parts of SPM, especially in Dianchi; the proportions of algae in the SPM fractions were measured as 10.4 and 7.1 % in Taihu in winter and summer, 4.5 % in Chaohu, and 53.3 % in Dianchi, both in summer season. The total As in SPM had a significant positive relationship with total As in water and a high distribution coefficient (Kd) between SPM and dissolved fraction of As at all three lakes. The high proportions of Algae, especially Cyanophyta in the composition of SPM in the three large shallow lakes, might play an important role in affecting the As distribution between the aqueous and particulate phases in aquatic ecosystem.

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“…1). Its average water depth is approximately 5 m, its maximum water depth is 8 m, and its surface area is approximately 306 km 2 (Du et al, 2011). Dianchi Lake is divided into two parts, Caohai Lake and Waihai Lake, by a man-made dike.…”

Section: Study Area and Monitoring Sitesmentioning

confidence: 99%

Temporal and spatial changes of water quality and management strategies of Dianchi Lake in southwest China

Zhang

Zeng

Wang

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Temporal and spatial changes to the water quality of Dianchi Lake in southwest China were investigated using monthly monitoring data from 2005 to 2012. Dianchi Lake is divided into two parts, Caohai Lake and Waihai Lake, by a man-made dike. Caohai Lake lies at the north of Dianchi Lake, while Waihai Lake is the main water body of Dianchi Lake and accounts for 96.7 % of the whole area of the lake. Based on the analysis of total phosphorus (TP), total nitrogen (TN), and chlorophyll a (Chl a) concentrations, it was determined that, in Caohai Lake, the annual concentrations of these variables ranged from 0.19-1.46 mg L −1 , 6.11-16.79 mg L −1 , 0.06-0.14 mg L −1 , respectively. In addition, the annual concentrations of TP, TN and Chl a in Waihai Lake ranged between 0.13 and 0.20 mg L −1 , 1.82 and 3.01 mg L −1 , and 0.04 and 0.09 mg L −1 , respectively. Cluster analysis (CA) classified the 10 monitoring sites into two clusters (cluster A and cluster B) based on similarities of water quality characteristics. Our data revealed that the current status of water quality within Caohai Lake was much worse than that of Waihai Lake. Water quality was seriously degraded during the economic boom near the period of the "Eleventh Five-Year Plan" (2005)(2006)(2007)(2008)(2009)(2010), and gradually improved from 2010 to 2012 because of the "standard emission directive to industry". The main factors that influenced the spatial and temporal changes to water quality were natural factors including lake evolution and regional characteristic as well as human factors such as pollution load into the lake and management strategies that were already adopted. Some activities and regulations were implemented to enhance the lake environment by controlling wastewater emissions and establishing regulations to protect the lakes in the Yunnan Province. However, problems with institutional fragmentation (horizontal and vertical), simple treatment methods, low-intensity investment in pollution control, and lack of meaningful endogenous pollution control strategies were still present in the lake management strategy. To solve these problems, suitable control measures are needed, especially considering the current old-age status of Dianchi Lake. The fundamental improvement of the water quality within Caohai Lake was dependent on the measures taken in the upper reaches of the Caohai Watershed, including further recovery of submerged plants, resource utilization by floating plants and the reinforcement of sediment disposal. Management strategies for endogenous pollution in Waihai Lake were mainly dependent on restocking algae-eating fish and the ecological restoration of macrophytes. In this way, the swamping trend and the ageing process that is occurring in Dianchi Lake can be stunted. And the management strategies would be a contribution to the management of water conflicts between mankind and ecosystems in similar lakes.

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Effect of eutrophication on molluscan community composition in the Lake Dianchi (China, Yunnan)

Cited by 51 publications

References 16 publications

Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

Population structure of an endemic gastropod in Chinese plateau lakes: evidence for population decline

Distribution of arsenic between the particulate and aqueous phases in surface water from three freshwater lakes in China

Temporal and spatial changes of water quality and management strategies of Dianchi Lake in southwest China

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