Spatial distribution of subfossil Chironomidae in surface sediments of a large, shallow and hypertrophic lake (Taihu, SE China)

Cao, Yanmin; Zhang, Enlou; Chen, Xu; Anderson, N. J.; Shen, Ji

doi:10.1007/s10750-012-1030-3

Cited by 19 publications

(11 citation statements)

References 40 publications

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“…The distribution of the dominant species showed marked spatial heterogeneity in Lake Taihu, corresponding well with the site-specific differences of trophic levels, macrophytes and sediment characteristics (Ma et al 2008;Ji et al 2011;Cao et al 2012). In this study, zone I showed the highest trophic level because of the large amount of anthropogenic pollutant inputs.…”

Section: Discussionsupporting

confidence: 75%

Spatial variation in nutrient excretion by macrozoobenthos in a Chinese large shallow lake (Lake Taihu)

Song

Cao

et al. 2015

Journal of Freshwater Ecology

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Nutrient (N and P) fluxes via excretion by macrozoobenthos were estimated in a Chinese large shallow lake (Lake Taihu). The spatial variation in nutrient fluxes and the differences of specific excretion rate among six dominant species were quantified. The distribution of dominant species varied significantly among different trophic lake areas. The maximum biomass of macrozoobenthos was calculated in phytoplanktondominated lake areas, while the minimum occurred in macrophyte-dominated lake areas. Mass-specific excretion rate among six dominant species was significantly different. Our results indicated that nutrient flux through benthic invertebrate varied spatially, which was affected by dominant benthic species composition and biomass. Limnodrilus hoffmeisteri, Corbicula fluminea and Bellamya aeruginosa made the greatest contribution to the total nutrient fluxes in Lake Taihu. N and P fluxes excreted by macrozoobenthos were greatest in phytoplankton-dominated lake areas (1037.7 mmol N m ¡2 d ¡1 and 111.74 mmol P m ¡2 d ¡1 ), which were almost 20 times greater than in the other lake areas. Since N and P excreted by macrozoobenthos could be rapidly absorbed by algae, macrozoobenthos might be a significant nutrient source contributing to frequent algal blooms in Lake Taihu.

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Section: Discussionsupporting

confidence: 75%

Spatial variation in nutrient excretion by macrozoobenthos in a Chinese large shallow lake (Lake Taihu)

Song

Cao

et al. 2015

Journal of Freshwater Ecology

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“…Percentage of sand fraction is also one of the best explicative variables to understand the spatial distribution of diatom and chironomid assemblages in Lake Azul. This sediment variable has been previously reported as influencing subfossil assemblage composition (Cao et al 2012;Eggermont et al 2007). A higher percentage of sand fraction reveals intensive erosion from the lake shore and can provide information about the hydrodynamic intensity in lake Azul.…”

Section: Sedimentation and Taphonomic Processes Affects The Spatial Dmentioning

confidence: 63%

“…Similarly, chironomids are an important proxy to assess secondary production in lakes (Anderson et al 2012). These two groups colonize many habitats both within the littoral zone and deep lake environments (Cao et al 2012;Laird et al 2010). Therefore, diatoms and chironomids are ideal proxies for assessing if they follow the IDH in deep lakes.…”

Section: Introductionmentioning

confidence: 99%

Causes of spatial distribution of subfossil diatom and chironomid assemblages in surface sediments of a remote deep island lake

et al. 2018

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Until recently, the distribution of diatom and chironomid species assemblages and their attributes (e.g. species richness and diversity) in relation to water depth and sedimentary environments have been identified but not quantified. The influence of environmental variables on assemblage distribution and taxa richness in a deep, monomitic lake in São Miguel Island is assessed. Attention is given to community variation along a depth gradient. Surface-sediment diatom and chironomid assemblages were collected along three transects from shoreline to the centre deep basin of the lake at a resolution of 1 m water depth. Linear and unimodal regressions were used to test taxon richness, taxon diversity and taxon evenness versus water depth of each transept. A hump-shaped relationship between species richness and water depth was noted, with a peak occurring at mid depth levels, meaning that samples located at that depth better represented the total subfossil assemblage of lake Azul. Also, diatom and chironomid assemblages in Lake Azul, and taphomomic effects, were influenced by sedimentary environmental processes depending on the lake morphology. Based on the present results, in order to determine ideal coring locations for lake studies combining diatom and chironomid analyses, an understanding of the spatial distribution of these biota is essential.

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“…This is particularly important when the drainage basin has been subjected to intensive and spatially variable human activities. Furthermore, within a large, shallow lake of a unique morphology with series of islands and various substrates, the subfossil archive recorded in a single sediment core might not represent the entire chironomid fauna across the lake (Cao et al, 2012). Based on the different trophic levels and chironomid assemblages investigated in a previous study (Cao et al, 2012), in this study, we reconstruct nutrient histories via a Chinese chironomid-TP transfer function from the lower Changjiang River Basin for four short cores selected from different parts of the Taihu Lake.…”

Section: Introductionmentioning

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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Spatial distribution of subfossil Chironomidae in surface sediments of a large, shallow and hypertrophic lake (Taihu, SE China)

Cited by 19 publications

References 40 publications

Spatial variation in nutrient excretion by macrozoobenthos in a Chinese large shallow lake (Lake Taihu)

Spatial variation in nutrient excretion by macrozoobenthos in a Chinese large shallow lake (Lake Taihu)

Causes of spatial distribution of subfossil diatom and chironomid assemblages in surface sediments of a remote deep island lake

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

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