Influence of environmental and spatial factors on the distribution of surface sediment diatoms in Chaohu Lake, southeast China

Chen, Xu; Yang, Xiangdong; Dong, Xuhui; Liu, Enfeng

doi:10.2478/v10184-011-0070-5

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…However, this species also prefers soft and unstable substrata (Little and Smol, 2000;Broderson et al, 2001), thus substrates with an organic content lower than 1.2%-1.5% would not be suitable for the development of C. plumosus-type (Armitage et al, 1995). Additionally, it is inappropriate to neglect the overwhelming effects of spatial factors on biotic communities (Cao et al, 2012;Chen et al, 2012), as displayed via the ′autogenous structure′ among individuals and spatial environmental differences (Bellier et al, 2007). This is likely true for such a large and complex ecosystem in which environmental and spatial factors operate in concert on biota; therefore, reconstructions based solely on nutrient parameters may be masking other important changes in ecosystem functioning (Sayer et al, 2010).…”

Section: Implications For Future Workmentioning

confidence: 99%

Spatially different nutrient histories recorded by multiple cores and implications for management in Taihu Lake, eastern China

et al. 2013

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The Taihu Lake, a large shallow lake in the floodplain of the Changjiang (Yangtze) River in the eastern China, is faced with challenging ecological problems resulting from eutrophication, which has affected the regional freshwater supply of a large population. Although efforts have been made to assess the nutrient evolution histories in the northern bays, little is known regarding nutrient histories in different parts across the entire lake basin. In this paper, we present nutrient histories for different parts of the lake based on chironomid transfer functions applied to four short cores obtained from the northern, western and eastern regions of the lake. The chironomid-inferred total phosphorus (CI-TP) concentrations were compared with the phosphorus concentrations obtained by using instrumental and sedimentary data. The results suggest that trophic evolution histories were asynchronous throughout the lake during the past decades in response to different ecological regimes controlled by the nutrient input, wind direction and shoreline topography. The restoration of aquatic plants may be an effective option for the management of lake rehabilitation to ′natural′ conditions. Given the multiple factors controlling the biotic communities in such a large and complex lake, combined analyses among the multi-proxies encountered in the sediments are necessary for comprehensive insight into paleolimnological studies. The spatial heterogeneity in the ecological trajectories within this complicated ecosystem suggests that different management practices should be undertaken for specific lake zones in the Taihu Lake.

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Section: Implications For Future Workmentioning

confidence: 99%

Spatially different nutrient histories recorded by multiple cores and implications for management in Taihu Lake, eastern China

et al. 2013

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“…4) are likely to be being influenced more greatly by the later summer insolation, particularly due to presence of A. granulata, which is often considered to bloom in the late summer during when waters have warmed and overturning occurs (Kilham and Kilham, 1975;O'Farrell et al, 2001). This species is heavily silicified and contributes substantially to the silica preserved in Baunt (Chen et al, 2012;Kilham et al, 1986), and therefore, it is likely the diatoms are again introducing a bias in the record, to mid-late summer conditions, and this could delay a record of Early Holocene warming linked to increased insolation being recorded.…”

Section: Ka Cal Bp)mentioning

confidence: 99%

Hydrological (in)stability in Southern Siberia during the Younger Dryas and early Holocene

Harding

Безрукова

Kostrova

et al. 2020

Global and Planetary Change

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Southern Siberia is currently undergoing rapid warming, inducing changes in vegetation, loss of permafrost, and impacts on the hydrodynamics of lakes and rivers. Lake sediments are key archives of environmental change and contain a record of ecosystem variability, as well as providing proxy indicators of wider environmental and climatic change. Investigating how hydrological systems have responded to past shifts in climate can provide essential context for better understanding future ecosystem changes in Siberia. Oxygen isotope ratios within lacustrine records provide fundamental information on past variability in hydrological systems. Here we present a new oxygen isotope record from diatom silica (ẟ 18 O diatom) at Lake Baunt (55 • 11 ′ 15 ′′ N, 113 • 01,45 ′′ E), in the southern part of eastern Siberia, and consider how the site has responded to climate changes between the Younger Dryas and Early to Mid Holocene (ca. 12.4 to 6.2 ka cal BP). Excursions in ẟ 18 O diatom are influenced by air temperature and the seasonality, quantity, and source of atmospheric precipitation. These variables are a function of the strength of the Siberian High, which controls temperature, the proportion and quantity of winter versus summer precipitation, and the relative dominance of Atlantic versus Pacific air masses. A regional comparison with other Siberian ẟ 18 O diatom records, from lakes Baikal and Kotokel, suggests that ẟ 18 O diatom variations in southern Siberia reflect increased continentality during the Younger Dryas, delayed Early Holocene warming in the region, and substantial climate instability between ~10.5 to ~8.2 ka cal BP. Unstable conditions during the Early Holocene thermal optimum most likely reflect localised changes from glacial melting. Taking the profiles from three very different lakes together, highlight the influence of site specific factors on the individual records, and how one site is not indicative of the region as a whole. Overall, the study documents how sensitive this important region is to both internal and external forcing.

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“…dubius and A. alpigena were the indicative species in Group II, and both of them were typical nutrient-tolerant species in the Yangtze floodplain lakes Yang et al 2008;Chen et al 2011Chen et al , 2012. Both of their TP optima exceeded 130 μg l -1 in the Yangtze floodplain diatom-phosphorus calibration dataset .…”

Section: Responses Of Diatoms To Metal Pollutionmentioning

confidence: 99%

Use of siliceous algae as biological monitors of heavy metal pollution in three lakes in a mining city, southeast China

Chen

Mao

Cao

et al. 2013

Oceanological and Hydrobiological Studies

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In order to assess the ecological status of three lakes in a historical mining city (SE China), water metal concentrations and surface sedimentary diatoms and chrysophyte cysts were analyzed in 20 sampling sites. The significant correlations between the algal indices and the cumulative criterion unit (CCU) scores confirmed the importance of heavy metals in shaping algae communities. In the metal-polluted sites, diatom assemblages were dominated by metal-tolerant species, such as Nitzschia palea and Nitzschia perminuta. In the unpolluted samples, diatom assemblages were characterized by Cyclostephanos dubius, Discostella pseudostelligera and Aulacoseira species (mainly A. alpigena, A. granulata and A. ambigua). These dominant taxa in the unpolluted samples might be sensitive to metal contamination but tolerant of eutrophication. In addition, nonspherical cysts were much * Corresponding author e-mail: xuchen09@gmail.com more abundant in the polluted sites, indicating that their presence should be indicative of metal contamination in this region. This study provides some clues for future metal pollution assessment through the use of siliceous algae in metal polluted lakes.

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Influence of environmental and spatial factors on the distribution of surface sediment diatoms in Chaohu Lake, southeast China

Cited by 7 publications

References 26 publications

Spatially different nutrient histories recorded by multiple cores and implications for management in Taihu Lake, eastern China

Spatially different nutrient histories recorded by multiple cores and implications for management in Taihu Lake, eastern China

Hydrological (in)stability in Southern Siberia during the Younger Dryas and early Holocene

Use of siliceous algae as biological monitors of heavy metal pollution in three lakes in a mining city, southeast China

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